Electric trimmer
An electric trimmer is a hand-held mower that operates on an electrical network. Among its indisputable advantages are:
– light weight (with the electric trimmer it is easy to operate a woman or teenager)
– low)
– little noise during operation;
– button start.
Due to its low weight, the electric trimmer also has a relatively low power. They can mow the grass near the house, but if the landscape is complex with differences, then the task becomes much more complicated. In addition, some shrubs and plants are simply impossible to mow with such a device, the line is constantly torn, and the motor overheats.
Among other things, there are other disadvantages to an electric trimmer: attachment to an outlet. This applies to most budget models. If a large area is required to mow, then several extension pieces may be required. In addition, the wires can cling to shrubs and trees. Using the electric trimmer after rain is also not recommended, as there is a high risk of short circuits.
There are electrical models that work not only from the mains, but also from the battery. The weight of the trimmer is significantly higher, instead of the standard 1.5-3 kg, it is 4.5-5 kg, which is not always convenient. Battery powered electric models are supplied with a shoulder strap. Such trimmers cost an order of magnitude higher: 4-7 thousand rubles.
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The grass on the plot near the house grows quite quickly. Manual oblique mowing is not always convenient, and it takes a lot of time. But the mowing with a hand trimmer will take a few minutes. There are two types of trimmer: gasoline and electric. Each of them has a number of their pros and cons.
Which trimmer is best. Gasoline or electric. Petrol trimmer
There are several advantages to a gasoline trimmer:
– mobility (you can use it anywhere, even near the house, even in the field);
– high power;
– refueling at any time;
– high performance.
Petrol trimmers are not much more expensive than electric trimmers, so the price cannot be any special criterion when choosing. The weight of the device depends on how large the gas tank is. There are trimmers with a tank volume: 0.5 liters, 1 liter, 1.5 liters. The more volume, the more weight of the trimmer.
There are two types of gasoline trimmers: two-stroke and four-stroke. In the first type, gasoline diluted with special oil is poured into the tank. In the second, oil and fuel are poured separately. At the same time, the power of the four-stroke trimmer is several times more, and the noise effect from work is less.
If the model is provided, then in addition to the fishing line, you can also put a rotor attachment on the gasoline trimmer, which is designed for cutting small trees and large shrubs. The only disadvantage of gasoline models is the way they are turned on. It is required to pull a special cord-winder, which requires some physical effort.
It is impossible to say unequivocally which model is better, gasoline or electric. It is worth remembering that for mowing grass in large and densely planted areas, it is more advisable to purchase powerful gasoline trimmers, and light electric models will also cope with mowing lawn or monotonous grass in small areas.
Which trimmer is better, petrol or electric?
The emerald and well-groomed lawn in the garden area pleases the eye of the summer resident. Electric and gasoline mowers, or trimmers (from the English word trim. cutting, trimming) help to achieve such a perfectly even grass cover.
Trimmers are handheld garden tools. The scythe trimmer is not to be confused with the lawn mower. Without a trimmer, you will NOT be able to cut grass at the edge of the lawn, around a flower bed, berry bushes or along garden paths.
There are two types of garden trimmers. gasoline and electric.
To answer the question of which trimmer is better. gasoline or electric, you should first familiarize yourself with this garden unit.
Thick line serves as the cutting element of the trimmer. There are also additional options in the form of a metal disc or knife. Tool weight varies from 2.5 to 7 kilograms. The width of the working part, that is, the mows, ranges from 25 to 40 cm.
In petrol trimmers, the cutting element is driven by an internal combustion engine. If the trimmer motor is two-stroke, then the fuel for it is a mixture of AI-92 gasoline and oil. Gasoline and oil are poured into a four-stroke unit separately, it is more powerful than a two-stroke unit and is much quieter. Petrol trimmer
The volume of the fuel tank in gasoline trim tabs ranges from 0.5 to 1.5 liters. The larger it is, the longer the unit will work at one gas station, but its weight, of course, will be more.
In gasoline trimmers, the motor is usually located on top, however, there are exceptions when it is placed in a special knapsack, which the porter puts on the shoulders. Some 4-stroke trimmers have additional attachments and can convert from a scythe to a delimber, snow blower and even a cultivator.
for petrol trimmers range from 9 to 80 thousand rubles.
Electric trimmers operate on mains power (Cable-equipped) or battery. The electric motor can be positioned both above and below. Overhead trimmers are more powerful. Additional attachments can be sold to them. a brush cutter or a saw. On models whose names begin with the letters ES and EB, you can put a cutter knife instead of a fishing line as a cutting element. Battery-operated electric trimmers come with shoulder straps. Electric trimmer
.
What kind of trimmer you need to have in the country. gasoline or electric. is up to the owners to decide. If you need to mow the grass on 2-3 acres from time to time, then an electric one will do. It is lightweight, easy to operate, and the noise level is quite low. At the same time, such a trimmer has a low performance due to low power, as well as dependence on the proximity of the outlet. In addition, it is not recommended to use it in wet weather.
The gasoline trimmer is suitable for medium-sized areas with an abundance of varied landings and difficult terrain. It has a binding to an electrical outlet. In addition, it is more powerful than its electrical counterparts and therefore more functional. The disadvantage is high noise level, significant weight and considerable price.
How the four-stroke gasoline engine works
When inlet, the piston goes from top dead center (TDC) to bottom (BDC). At the same time, with the help of the camshaft cams, the intake valve is opened, through which the fuel mixture is sucked into the cylinder.
During the reverse stroke of the piston (from BDC to TDC), the fuel mixture is compressed, accompanied by an increase in its temperature.
Before the very end of the compression between the electrodes of the plug, a spark ignites, igniting the fuel mixture, which, when burned, forms flammable gases that push the piston down. A working stroke occurs, in which useful work is performed.
After the BDC piston transitions, the exhaust valve opens, allowing the upward-moving piston to push the exhaust gas out of the cylinder. Release in progress. At TDC, the outlet valve closes and the cycle repeats again.
Differences between a two-stroke engine and a four-stroke engine
The working cycle of an internal combustion engine (ICE). Is a series of actions resulting in a portion of the force (power) acting on the engine crankshaft. The working cycle consists of:
- Filling the cylinder with a fuel mixture;
- Its compression;
- Ignition of the mixture;
- Expansion of gases and cleaning the cylinder from them.
ICE clock. This is the movement of the piston in one direction (up or down). For one revolution of the crankshaft, two cycles are performed. The one in which expansion of the burnt gases occurs and useful work is performed is called the working stroke of the piston.
Engines in which the operating cycle takes 2 strokes (one revolution of the crankshaft) are called two-stroke. Engines in which the operating cycle takes 4 strokes (two crankshaft revolutions) are called four-stroke. Two- and four-stroke engines can be both gasoline (carburetor) and diesel. What are the main operational and design features of gasoline two-stroke and four-stroke engines? What is the difference between a two-stroke and a four-stroke? To better understand this, you need to get acquainted with the principle of their work.
The principle of operation of a two-stroke gasoline engine
When compressed, the piston moves from bottom dead center to top dead center. After the purge window (2) is closed first, through which the fuel mixture enters the cylinder, and then the outlet (3), through which the exhaust gases exit, the compression of the air-gasoline mixture begins. At the same time, a vacuum is created in the crank chamber (1), which sucks in the next portion of fuel from the carburetor. When the piston approaches the top dead center, the mixture ignites from the spark of a candle, and the resulting gases push the piston downward, rotating the crankshaft and perform useful work.
In the crank chamber during the working stroke, the pressure rises, compressing the fuel mixture that got there in the previous stroke. When the upper surface of the piston (its O-ring) reaches the exhaust port, the latter opens, releasing exhaust gases into the muffler. With further movement, the piston opens the purge window, and the fuel mixture under pressure in the crank chamber enters the cylinder, displacing the remaining exhaust gases (by purging) and filling the over-piston space. When the piston passes the bottom dead center, the working cycle is repeated.
Operational and design differences between two-stroke and four-stroke gasoline engines
In a two-stroke engine, cylinder filling and cleaning are performed simultaneously with compression and expansion strokes. While the piston is near bottom dead center. For this, there are two holes in the walls of the cylinder. Inlet or purge and outlet, through which the fuel mixture is injected and the exhaust gas is released. There is no gas distribution mechanism with valves in the two-stroke engine, which makes it much simpler and lighter.
Liter capacity. Unlike a four-stroke engine, in which one working stroke occurs for two revolutions of the crankshaft, in a two-stroke engine, the working stroke is performed with each revolution of the crankshaft. This means that a 2-stroke engine should have (in theory) twice the liter horsepower (power-to-displacement ratio) than a 4-stroke. In practice, however, the excess is only 1.5-1.8 times. This is due to the incomplete use of the piston gait during expansion, the worst mechanism for releasing the cylinder from the exhaust gases, the waste of part of the power for purging and other phenomena associated with the peculiarities of gas exchange of 2-stroke engines.
Fuel consumption. Outperforming the four-stroke engine in liter and power density, the two-stroke engine is inferior to it in terms of economy. The displacement of exhaust gases is carried out in it by an air-fuel mixture entering the cylinder from the crank chamber. In this case, part of the fuel mixture enters the exhaust ducts, being removed along with the exhaust gases and DO NOT perform useful work.
Lubrication. Two-stroke and four-stroke engines have different engine lubrication principles. In 2-stroke models, it is mixed in certain proportions (usually 1: 25-1: 50) of engine oil with gasoline. The air-fuel-oil mixture, circulating in the crank and piston chambers, lubricates the connecting rod and crankshaft bearings, as well as the cylinder mirror. When the fuel mixture ignites, the oil, which exists in the form of the smallest droplets, burns along with the gasoline. The products of its combustion are removed together with the exhaust gases.
There are two methods of mixing oil with gasoline. Simple mixing before filling the fuel tank and separate feeding, in which the fuel-oil mixture is formed in the intake pipe located between the carburetor and the cylinder.
In the latter case, the engine has an oil tank, the pipeline of which is connected to a plunger pump, which supplies oil to the inlet pipe in exactly the amount that is required depending on the amount of the air-gasoline mixture. The pump performance depends on the position of the “gas” feed knob. The more fuel is supplied, the more oil is supplied, and vice versa. The separate lubrication system for two-stroke engines is more advanced. With it, the ratio of oil to gasoline at low loads can reach 1: 200, which leads to a decrease in smoke, a decrease in the formation of carbon deposits and oil consumption. This system is used, for example, on modern scooters with two-stroke engines.
In a four-stroke engine, oil is not mixed with gasoline, but is supplied separately. For this, the engines are equipped with a classic lubrication system, consisting of an oil pump, filter, valves, pipeline. The role of the oil tank can be performed by the engine crankcase (lubrication system with a “wet” sump) or a separate tank (system with a “dry” sump).
When lubricated with a “wet” sump, pump 3 sucks oil from the sump, pumps it into the outlet cavity and then feeds it through the channels to the crankshaft bearings, parts of the crank group and the gas distribution mechanism.
When lubricating with a “dry” sump, the oil is poured into the reservoir, from where it is supplied to the rubbing surfaces using a pump. And part of the oil that flows into the crankcase is pumped out by an additional pump, returning it to the tank.
There is a filter to clean the oil from wear products of engine parts. If necessary, a cooling radiator is also installed, since during operation the oil temperature can rise to high temperatures.
Since oil burns out in two-stroke engines, and it is in four-stroke engines, the requirements for its properties vary greatly. Oil used in two-stroke engines should leave a minimum of ash and soot deposits, while oil for four-stroke engines should be stable for as long as possible.
Comparison of the main parameters of two-stroke and four-stroke engines:
- Liter capacity. In 2-stroke engines, 1.5-1.8 times higher than in 4-stroke engines.
- Specific power (ratio of power to engine mass). Also higher in 2-stroke.
- Providing fuel supply and cylinder cleaning. 4-stroke engines Equipped with a gas distribution mechanism, which is absent in 2-stroke engines.
- Profitability. Higher in 4-stroke, fuel consumption of which is about 20-30% lower than in 2-stroke.
| Engine | Number of measures | Power, hp. | Fuel consumption (gasoline), kg / hour |
| Briggs Stratton | 4 | 3.5 | 0.9 |
| Minarelli | 2 | 3.5 | 1.5 |
| Tecumzeh | 4 | 3.7 | 0.9 |
| Briggs Stratton | 4 | 5.0 | 1.0 |
| Tecumzeh | 4 | 5.0 | 1.0 |
| Briggs Stratton | 4 | 6.0 | 1.1 |
| Lombardini | 4 | 7.0 | 1.6 |
| Minsel | 2 | 7.0 | 2.1 |
- Lubrication system. Oil for 2-stroke engines is diluted in gasoline or (much less often) is fed from the oil tank to the intake manifold and burns along with the fuel in the piston chamber. A complete system is implemented in 4-stroke engines, which provides high-quality engine lubrication and long-term oil use.
- Environmental friendliness. Higher in 4 stroke. The exhaust of 2-stroke engines is more toxic.
- Noisy work. 4-stroke engines are quieter.
- The complexity of the design. 2-stroke engines are much simpler than 4-stroke engines.
- Resource of work. Higher in 4-stroke cycles due to better lubrication system and lower crankshaft speed.
- The speed of revving. 2-stroke engines pick up speed faster.
- Service. difficult in 4-stroke due to the presence of a gas distribution mechanism and a more complex lubrication system.
- Weight. 2-stroke is much lighter.
- Price. 2-stroke cheaper.
Due to their high power density, low weight, ease of maintenance, two-stroke engines have a fairly wide range of applications. Regarding some petrol engineering, the question is which engine to use. Two-stroke or four-stroke. Does not even arise. In chainsaws, for example, the two-stroke engine, due to its low weight and high power density, is out of competition compared to a four-stroke engine. 2-stroke engines are also widely used in scooters, motor vehicles, aircraft model building.
And yet, due to the toxicity of the exhaust and noise, 2-stroke engines give up their positions before 4-stroke engines. Their greater competitiveness is possible with the use of new technological solutions. Such, for example, as the idea of Aprilia and Orbital companies to use clean air to purge a two-stroke engine. The fuel in their model is fed through a nozzle located in the engine head and oil is added to the purge air. Such an engine even surpasses a four-stroke in terms of efficiency, its environmental friendliness also meets modern requirements. This is just the main advantage of 2-stroke engines. Simplicity of their design. Suffers somewhat from innovation.
Trimmer two-stroke or four-stroke which is better?
Differences between a two-stroke engine and a four-stroke
The working cycle of a gasoline engine (ICE) is a series of actions, as a result of which a portion of the effort (power) is made acting on the engine crankshaft. The working cycle consists of:
- Filling the cylinder with a fuel consistency;
- Its compression;
- Inflammation of the consistency;
- Expansion of gases and cleaning from their cylinder.
A stroke in an internal combustion engine is the movement of the piston in one direction (up or down). For one revolution of the crankshaft, two cycles are performed. The one in which the burnt gases expand and the necessary work is performed is called the working stroke of the piston.
Engines in which the operating cycle takes 2 strokes (one revolution of the crankshaft) are called two-stroke. Engines in which the operating cycle takes 4 strokes (two crankshaft revolutions) are called four-stroke. Two- and four-stroke engines can be both gasoline (carburetor) and diesel. What are the main operational and design features of gasoline two-stroke and four-stroke engines? What is the difference between a two-stroke and a four-stroke? To better understand this, you need to get acquainted with the principle of their work.
The principle of operation of a two-stroke gasoline engine
When compressed, the piston moves from bottom dead center to top dead center. Two-stroke or four-stroke? Which outboard motor is better which is two or. After the purge window (2) is closed first, through which the fuel mixture enters the cylinder, and then the outlet (3), through which the exhaust gases exit, the compression of the air-gasoline mixture begins. At the same time, a vacuum is created in the crank chamber (1), which sucks in the next portion of fuel from the carburetor. When the piston approaches the top dead center, the mixture ignites from the spark of a candle, and the resulting gases push the piston downward, rotating the crankshaft and perform useful work.
In the crank chamber during the working stroke, the pressure rises, compressing the fuel mixture that got there in the previous stroke. When the upper surface of the piston (its O-ring) reaches the exhaust port, the latter opens, releasing exhaust gases into the muffler. With further movement, the piston opens the purge window, and the fuel mixture under pressure in the crank chamber enters the cylinder, displacing the remaining exhaust gases (by purging) and filling the over-piston space. Which electric trimmer is best for giving? That cut, push-pull or. When the piston passes the bottom dead center, the working cycle is repeated.
Operational and design differences between two-stroke and four-stroke gasoline engines 2T or 4T? Advantages and disadvantages.
Lecture on the topic of 2 and 4-stroke motors from the point of view of the consumer. Have questions? events in the forum
Two-stroke or four-stroke trimmer which is better? How to choose a trimmer, BUY trimmers.
For even more information on repair and tool selection on our website www.Looktool.Ru visit we are glad to everyone.
In a two-stroke engine, cylinder filling and cleaning are performed simultaneously with compression and expansion strokes. while the piston is near bottom dead center. To do this, there are two openings in the cylinder walls. inlet or purge and outlet, through which the fuel mixture is injected and the exhaust gas is released. There is no gas distribution mechanism with valves in the two-stroke engine, which makes it much simpler and lighter.
Liter capacity. Unlike a four-stroke engine, in which one working stroke occurs for two revolutions of the crankshaft, in a two-stroke engine, the working stroke is performed with each revolution of the crankshaft. This means that a 2-stroke engine should have (in theory) twice the liter horsepower (power-to-displacement ratio) than a 4-stroke. In practice, however, the excess is only 1.5-1.8 times. This is due to the incomplete use of the piston gait during expansion, the worst mechanism for releasing the cylinder from the exhaust gases, the waste of part of the power for purging and other phenomena associated with the peculiarities of gas exchange of 2-stroke engines.
Fuel consumption. Outperforming the four-stroke engine in liter and power density, the two-stroke engine is inferior to it in terms of economy. The displacement of exhaust gases is carried out in it by an air-fuel mixture entering the cylinder from the crank chamber. In this case, part of the fuel mixture enters the exhaust ducts, being removed along with the exhaust gases and DO NOT perform useful work.
There are two methods of mixing oil with gasoline. Simple mixing before filling the fuel tank and separate feeding, in which the fuel-oil mixture is formed in the intake pipe located between the carburetor and the cylinder.
In the latter case, the engine has an oil tank, the pipeline of which is connected to a plunger pump, which supplies oil to the inlet pipe in exactly the amount that is required depending on the amount of the air-gasoline mixture. The pump performance depends on the position of the gas feed knob. The more fuel is supplied, the more oil is supplied, and vice versa. The separate lubrication system for two-stroke engines is more advanced. With it, the ratio of oil to gasoline at low loads can reach 1: 200, which leads to a decrease in smoke, a decrease in the formation of carbon deposits and oil consumption. This system is used, for example, on modern scooters with two-stroke engines.
In a four-stroke engine, oil is not mixed with gasoline, but is supplied separately. For this, the engines are equipped with a classic lubrication system, consisting of an oil pump, filter, valves, pipeline. The role of the oil tank can be performed by the engine crankcase (lubrication system with a “wet” sump) or a separate tank (system with a “dry” sump).
When lubricated with a “wet” sump, pump 3 sucks oil from the sump, pumps it into the outlet cavity and then feeds it through the channels to the crankshaft bearings, parts of the crank group and the gas distribution mechanism.
When lubricating with a “dry” sump, oil is poured into the reservoir, from where it is supplied to the rubbing surfaces using a pump. And part of the oil that flows into the crankcase is pumped out by an additional pump, returning it to the tank.
There is a filter to clean the oil from wear products of engine parts. If necessary, a cooling radiator is also installed, since during operation the oil temperature can rise to high temperatures.
Since oil burns out in two-stroke engines, and it is in four-stroke engines, the requirements for its properties vary greatly. Oil used in two-stroke engines should leave a minimum of ash and soot deposits, while oil for four-stroke engines should be stable for as long as possible.
Comparison of the main parameters of two-stroke and four-stroke engines:
- Liter capacity. In 2-stroke engines, 1.5-1.8 times higher than in 4-stroke engines.
- Specific power (ratio of power to engine mass). Also higher in 2-stroke.
- Providing fuel supply and cylinder cleaning. 4-stroke engines Equipped with a gas distribution mechanism, which is absent in 2-stroke engines.
- Profitability. Higher in 4-stroke, fuel consumption of which is about 20-30% lower than in 2-stroke.
So which motor is better. two-stroke or four-stroke?
What can you add to the tons of material written on this topic? Another commonplace?
Nevertheless, having stumbled upon another forum battle within the framework of the permanent war of “pointed and blunt points”, I decided to speak out and give some figures.
Let’s try to figure it out quickly.
I will tell the truth about you that is worse than any lie
Jokes, jokes, but this is how decisions are often made. The buyer of the forums read it, then the seller of Npel’s songs. and that’s it, “the client is ripe.”.
Let’s answer simple questions.
It is more profitable for a motor manufacturer to sell which motor. simple and cheap or complex and expensive? Of course expensive!
Which motor has more details: a simple 2-stroke motor or a more complex one? Complex. Where is the likelihood of breakage more? Complex. Is it profitable for a manufacturer to sell repair parts? Yes!
Another very interesting question: why do most 2-stroke engines in terms of design look like awkward guests from the last century, like some kind of ugly ducklings, while four-stroke engines are almost ultra-design? What, “kopeck piece” you can not even make normal caps? It’s incomprehensible, at least incomprehensible.
Well, and finally, to the dealer and to everyone he feeds, which one is more profitable for you to sell the motor expensive or not very?
And who benefits from the “4-stroke” philosophy? Answer: it is beneficial for everyone in the chain from the manufacturer to the cashier, but, alas, not for you.
Pros of four-stroke outboard motors
- Less noise during operation (especially at low revs)
- Lower fuel consumption.
Not all 2-stroke engines require petrol and oil to be mixed first. Therefore, the lack of this procedure in the operation of 4-stroke units, I did not write them as an advantage. I could not cite the traditional argument in the stunning resource of 4 bars due to the lack of both compelling evidence of this statement, and the irrelevance of this problem for the overwhelming number of motorboats.
She also did not mention anything regarding the environmental friendliness of engines. This is not relevant for now. Good or bad, but the question is NOT posed point-blank, and there is no reason to think that in the near foreseeable future something will change here.
Dry residue
So, when asked why should we overpay so much for four clock cycles, it turns out, we can answer: “It is quiet and economical”.
Now let’s decide if this “quiet and modest girl” is worth the cost of the wedding?
It is easy to talk about “silence” to a person, and not to someone familiar with the subject of discussion. Yes, at low rpm, up to 1000-1200, the four-stroke is quiet, but at idle it is hardly even audible. I remember a couple of times, at first, the already running engine tried to start with a key. #128578;
However, everyone who has operated both 2- and 4-ton PLMs will tell you that starting from 4000 rpm. The difference in noise disappears and becomes insignificant towards the upper limit of the maximum.
Let it be significant (there are also “tractors” among 2-stroke engines), how long do we listen to the noise of our engine? Most of the rest / departure, the engine is muffled.
But low noise was never the decisive argument of the apologists of the four bars. The concrete argument in the dispute with thinkers from the opposite camp has always been economy.
Pros of two-stroke outboard motors
- Less weight;
- Better dynamics;
- Lower price;
- Ease of maintenance and repair (as a consequence of the simplicity of the design)
- Great reliability (also as a consequence of the simplicity of the design)
The economy must be economical
Four-stroke engines consume less gasoline. and this is an indisputable fact. Less gasoline. less loading of the boat, less cost of departure.
However, 4-stroke engines of the same power are usually heavier and more expensive than their two-stroke counterparts. Thus, whatever one may say, We must know:
- Does the fuel economy pay off the high cost of the engine itself;
- Does the difference in the weight of the required fuel compensate for the difference in the weight of the motors.
Yamaha, like some other manufacturers, publishes messages with the results of evaluating the performance of their PLMs. This information is freely available on the Internet at http://yamahaoutboards.com/owner-resources/performance-bulletins
To assess the economic effect of using a four-stroke engine, I needed data on the consumption of a pair of 2-ton and 4-ton PLM with the same number of horses. I chose two medium power engines:
- 2-t: Yamaha 50TLR (we know as Yamaha 50HETOL).
- 4-t: Yamaha F50TLR (we have Yamaha F50HETL).
The two-stroke “fifty kopeck piece” was tested on the Sundance FX 17 Flicker boat (length 5.21 m, width 1.98 m; gross weight during tests 710 kg).
Four-stroke. on boat Key West 166 SK (length 4.95 m, width 1.83 m; gross weight when tested 623 kg).
Please note that the boat on which the two-stroke is installed (Sundance FX 17) is slightly longer and wider than the other and is also heavier by 83 kg. But these are the closest in parameters and type of watercraft that I was able to find for a given power. Okay, let’s give a little head start to four bars. #128578;
The test results were as follows:
| rpm | speed km \ h |
consumption l \ h |
consumption l \ 100 km |
rpm | speed km \ h |
consumption l \ h |
consumption l \ 100 km |
| 1000 | 6.28 | 1.89 | 30.16 | 1000 | 6.44 | 1.51 | 23.52 |
| 1500 | 8.53 | 3.41 | 39.94 | 1500 | 7.72 | 2.27 | 29.40 |
| 2000 | 10.94 | 4.54 | 41.51 | 2000 | 9.17 | 3.79 | 41.27 |
| 2500 | 12.07 | 6.44 | 53.32 | 2500 | 11.59 | 4.92 | 42.47 |
| 3000 | 19.31 | 7.95 | 41.16 | 3000 | 16.74 | 6.81 | 40.71 |
| 3500 | 29.29 | 9.46 | 32.31 | 3500 | 28.97 | 6.81 | 23.52 |
| 4000 | 37.82 | 10.98 | 29.03 | 4000 | 35.89 | 8.71 | 24.26 |
| 4500 | 44.42 | 11.73 | 26.42 | 4500 | 42.16 | 10.60 | 25.14 |
| 5000 | 51.98 | 16.28 | 31.31 | 5000 | 46.99 | 13.25 | 28.19 |
| 5500 | 57.78 | 21.58 | 37.35 | 5500 | 51.34 | 17.79 | 34.66 |
| 5600 | 58.26 | 21.96 | 37.69 | 5950 | 54.88 | 18.93 | 34.49 |
Let’s transform the plate a little so that we can operate with both absolute and relative values:
| Rpm | consumption, l \ h Yamaha 50 |
consumption, l \ h Yamaha F50 |
difference in consumption,% |
| 1000 | 1.89 | 1.51 | 25.00 |
| 1500 | 3.41 | 2.27 | 50,00 |
| 2000 | 4.54 | 3.79 | 20,00 |
| 2500 | 6.44 | 4.92 | 30.77 |
| 3000 | 7.95 | 6.81 | 16.67 |
| 3500 | 9.46 | 6.81 | 38.89 |
| 4000 | 10.98 | 8.71 | 26.09 |
| 4500 | 11.73 | 10.60 | 10.71 |
| 5000 | 16.28 | 13.25 | 22.86 |
| 5500 | 21.58 | 17.79 | 21.28 |
RPM range from planing to
5000 is preferable for the boatmaster, who does not like to plod in half gas, but also does NOT intend to spend too much. Golden mean. And in this range, the four-stroke, as you can calculate, consumes on average 20.27% less than its two-stroke counterpart. In absolute terms, this savings will be approximately 2.65 l / h. By this amount, the F50 will consume less gasoline, operating at optimal speed.
Let’s count the money now. I will make a reservation right away, I do not take into account oil for 2 tons and oil and 2 filters for F50. The introduction of THESE variables into the calculation will not greatly affect the final result, but for F50, in this case, you will have to build a whole graph of the function.
So, let’s count gasoline. At the time of this writing, the cost of the “participants” in the test was as follows: Yamaha 50HETOL. 346,000 rubles, Yamaha F50HETL. 423,000 rubles. The four-stroke costs 77,000 rubles. expensive, but it saves gas.
So we decide to bet on savings. Let’s calculate when our “investments” for a start will simply return to us.
As already mentioned, for a given pair of engines, gasoline savings are
2.65 l / h in favor of the F50. The cost of the 92nd gasoline at the time of writing
36 rubles \ l. Let’s translate liters into money: 2.65X36 = 95.4. Thus, the average savings in rubles during the period will be 95.4 rubles.
Let’s calculate how many hours we need to return the money overpaid for a four-stroke engine on the saved gasoline:
807 hours! Do you feel the swing? This is exactly how much the F50 should work so that the overpayment when buying, in comparison with 50 2-t, is completely returned to your .
What is 807 m3 / h? I think you will not mind that there are not many people who roll more than 50 hours per season. And this is still quite optimistic. I personally haven’t been gaining 40 lately. We count the seasons: 807: 50 = 16.14. Think about this figure: 16 years! So much time must pass for the difference in cost of the considered pair of motors to pay off.
Four-stroke is sometimes preferable for some uses, and sometimes there is no alternative. For example, for known types of fishing at low rpm, a 4-stroke engine is more suitable (although there is something to argue about). For constant many hours of movement on the water, whether it is a pensioner who doesn’t want to do more in life, or a fisherman who fishes for days, from the last ice to the first, 4 clock cycles may also be more convenient for these people. And, of course, you shouldn’t forget about professional passenger carriers. this is to whom both resource and economy are important.
But what will “four strokes” give to a usually poor waterboat, resting on the river on a fine, quiet weekend, with watercraft designed for motors of 30-60 hp? Nothing but a sense of relief from the extra money. However stylish and prestigious it would NOT look on the transom “economically expensive” acquisition.
Thus, the choice of 4-stroke outboard motors for small seasonal runs, if it is much more expensive than a 2-stroke of the same power, looks unprofitable and irrational. Anyway, for those who count money.
What is better for giving. a lawn mower or a trimmer?
Gone are the days when, in order to put things in order on your site, you had to wave a hefty wooden scythe (while fearing that some necessary part of the body would not squint) or bowing to three deaths to work with a sickle in a state of complete NOT extension of the back. The range of garden equipment is now so wide that you can pick up any automated unit to choose from. a lawn mower, trimmer or lawn mower and work at your own pleasure.
Today we will talk about the choice of lawn mowers and trimmers. evaluate their pros / cons and find the perfect option. But we’ll deal with the lawn mower later. This is a topic for a separate article.
There are certain differences between the lawn mower and trimmer models, both in technical characteristics and in their scope. They are not only electric, but also gasoline. First, let us find out for ourselves that the trimmer is designed to care for small areas, or for fairly rare use. They are very weak, designed for grass, but are not suitable for dealing with shrubs, roots, large thickets.
Lawn Mowers have been specially designed for dense thickets of grass and shrubs. They look like a bar on which the engine is hung on one side, and the cutting tools (disc, line or knives, depending on the configuration) on the other. Line Not suitable for cutting thick grass or bushes. In such cases, knives should be used.
Lawn mowers can be both domestic and professional. Professional lawn mowers are distinguished by their high productivity and the ability to work without interruption for quite a long time. Plus, the set of accessories included is truly impressive. These lawn mowers also have improved body ergonomics and a reinforced design.
Professional models of such devices can withstand increased loads and are used in parks and large gardens. The set includes a non-separable bar. And the motor drive is located inside it. Such lawn mowers are very large and require a specially designated place for their storage. However, the design features also make professional lawn mowers practically invulnerable to debris, dust and dirt. Accordingly, the service life of such a lawn mower is significantly lengthened.
Household models are much more compact than professional ones. Their purpose is to care for small areas. over, very rare care. Their power barely reaches 2 liters. / S., Then, when in professional such power is initial. These lawn mowers are equipped with trimming attachments or steel knives, or both. They differ among themselves by the type of shaft. straight or flexible. They can also have a split or curved bar. From ourselves, we note that the split rod is more convenient to use due to its compact dimensions in the assembled state.
Lawnmower sticks are available in the form of the letters D, T or J. The sticks in the letter D are the most compact, helping to achieve maneuverability and high working speed. These lawn mowers are suitable for small areas.
A T-shaped lawn mower handle can be used in large open areas as well as for extended use.
J-handle can be used alone or in conjunction with D-handle.
We figured out the handles, now we will consider, perhaps, the most important thing. the type of engine. electric or gasoline. which is better to choose for your site.
Units with electric motors have low power, ease of use, including practically silent operation. The only drawback, perhaps, in such models is the constant connection to the power source. However, if you have a car, for example, it will be more difficult to get fuel for a lawn mower that runs on gasoline than plugging the power cord into an electrical outlet in the case of an electric model.
Petrol trimmers and lawn mowers are not as widespread as electric trimmers, due to the fact that petrol is more difficult to obtain than plugging into an outlet. In addition, gasoline models generate a sufficient level of noise, are heavier and have increased vibration. Petrol models with all this have increased power.
When choosing, focus also on the following indicators, which will help you determine the best option for yourself. For gasoline models, it is necessary to decide on the type of engine. it will be two-stroke or four-stroke. The four-stroke engine is reliable, heavy in weight. Gasoline and oil tanks are different. Such models are more expensive, however, they are more economical due to lower gas consumption.
In two-stroke models, a mixture for filling is used, which is harvested separately. from gasoline and oil in certain proportions. If you expect to rarely use a model of such a lawn mower, then please note that the mixture tends to deteriorate, so it must be drained when your lawn mower is idle. The two-stroke engine makes the lawn mowers lightweight, which is especially important if you are NOT a weightlifter and carrying weights is clearly not your favorite pastime.
Refueling can be played at any convenient place, even during operation. However, it should be borne in mind that for a two-stroke model, the mixture must be prepared in advance. The durability of the four-stroke engine will last longer.
Engine power plays an important role if you are working professionally with a lawn mower or trimmer. In the second case, it will only increase unnecessary spending on fuel or electricity. With a higher engine power, vibration also increases, which creates additional workload. For plots with a scale of 5 to 10 acres, an engine power of 1 kW will be quite sufficient.
What else affects the speed and quality of your work on your garden plot is the number of revolutions that the engine makes. Here the rule is quite simple. the cleaner and smoother you want to cut the plants after mowing, the more revolutions of the cutting attachments you should choose. However, do not overdo it here. to approach everything reasonably. In the end, no one with a ruler will measure the evenness of the cut of your lawn.
Now pay attention to the attachments that your lawn mower / trimmer is equipped with. It can be. fishing line, knives or discs (or all together). The line copes well with tall grass, shows very decent results in an open area. The lawn mower / trimmer can be realized with automatic or semi-automatic line feed. Automatic feed means that the mechanism feeds the line and the knife cuts it to the correct size. There are options for lawn mowers, where the line feeding and cutting is done manually. But the thickness of the line directly depends on the power of the motor. if the engine is powerful enough, then you can put a line with a thickness of 2.5 mm. The thicker the line, the coarser the grass you can cut.
Knives are used when mowing thick stems, pruning shrubs. Knives with 2 to 4 teeth are suitable for normal pruning. But for weaving grasses and bushes, it is better to take a knife with 8 teeth.
Discs are used in professional lawn mowers and trimmers. With their help you will cope Not only with shrubs, but also with small trees, with a trunk thickness of about 4 cm.Discs can have outer diameters of 300. 400 mm, and inner diameters. 20. 25.4 mm, thickness ranges from 0.8 to 2 mm. Lawn mowers should also have a special cover, which is designed to protect you from scattering the remains of grasses and stems.
Lawn mowers / trimmers use different types of shoulder straps. There are straps for one shoulder, but there are. Two at once. With proper load distribution, the shoulders and back are less fatigued during work. Professional models weigh up to 10 kg, so it makes sense to purchase them with backpack-type shoulder straps.
And in conclusion, a couple more words in comparison with lawn mowers and trimmers. If your plot is large, then it is worth purchasing a lawn mower, it will cope better with the task. However, with a lawn mower you will have more worries, because periodically you will have to do its maintenance. Change oil, spark plugs. And the electric trimmer is easier to maintain. in that it is enough to clean and lubricate it. The fuel tank of a domestic lawn mower is designed for approximately 1.5 hours of operation, after which it is necessary to stop work and refuel the unit. When working with an electric model, pay attention to the fact that you are tied with a cord to a power source, so you need to work carefully so as not to hurt your Ego. In terms of noise levels, a lawn mower is considerably noisier than an electric trimmer. When working with a lawn mower, you can ignore the weather. it will mow even damp plants. But the electric model only needs dry weather and dry material for Mowing.
We hope our advice will help you choose the right option for yourself, so as NOT to overpay extra money when buying. Well, a very wide range of a wide variety of lawn mowers and trimmers is presented on our website.