Lawn Mowers and Energy Usage

Well, grass consumes carbon dioxide and outputs oxygen. But mowing the grass consumes oxygen and outputs carbon dioxide. And of course mowing
the grass consumes fuel and outputs various air pollution.
So what's the most efficient way to mow the grass ?
First consider the engines. In general, an internal combustion engine gains efficiency with increased valve area over the displacement. So a twin-cylinder 500cc engine is likely more efficient than a single- cylinder 500cc engine. More likely, the buyer will find something like a twin-cylinder 660cc instead of a single-cylinder 590cc engine. But also the twin-cylinder engine will tend to be quieter than the single- cylinder engine.
Next is mowing width. And twin-blade riding lawn mowers can be found as small as 38" although a 42" will go through a small gate. And so does an 18 HP mower with a 42" mowing width use less fuel than a 10 HP mower with a 28" mowing width ?
Finally, there is a new type of transmission for riding lawn mowers. Well, a lawn mower runs wide-open because it has to cut the grass with the blades. And so a lawn mower changes speed by changing gearing and not by changing engine speed. The new hydrostatic transmissions vary the gearing with a hydraulic system instead of with mechanical gears or instead of with CVT belting. The result is that the mover can smoothly and effortlessly change speeds and easily switch between forward and reverse. Then mowing time is reduced as maneuvering is much easier. The hydrostatic transmission can be controlled by a lever or by foot pedals. A zero-turn riding lawn mower has a hydrostatic system for each rear wheel while a hydrostatic lawn tractor only needs one system for both rear wheels.
And so there is some amazing current technology for riding lawn mowers .
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Here you go. http://www.reelmowers.org /
Get some exercise.
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Paul Hovnanian mailto: snipped-for-privacy@Hovnanian.com
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On 7/11/2012 8:40 PM, PolicySpy wrote:

sheep
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Goats are more effective, the problem is that when the grass runs out, goats keep eating. They ate my friend Karen's Toyota. --scott
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"C'est un Nagra. C'est suisse, et tres, tres precis."

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Not really.. A smaller moving mass is likely to be the most efficient when compared to a mower with a larger moving mass. (it may take you more time.. but you will save fuel/energy).
An electrically powered lawn mower will be the most efficient. http://www.husqvarna.com/us/products/robotic-mowers/automower-solar-hybrid /

Err no.. The engines on lawn mowers use a governor to regulate speed and fuel consumption.
home.howstuffworks.com/home-improvement/repair/how-to-repair-small-engines.htm
"Governor: A governor is a device that automatically opens the engine's throttle when more power is needed and closes it when the load is light."
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T. Keating wrote:

PolicySpy writes:
This issue was only the efficiency of twin-cylinder engines versus single-cylinder engines.
T. Keating wrote:
> An electrically powered lawn mower will be the most efficient.

PolicySpy writes:
An electrical lawn mower has the problem of requiring a large diameter electric cord or requiring very heavy batteries. Also, the cost of the electrical mower is much higher while providing less performance.
T.Keating wrote:

PolicySpy writes;
A mower cuts crass without varying engine speed. To vary the driving speed of the riding lawn mower requires changes in gearing. The driving speed of a working riding lawn mower is controlled with gearing instead of with engine speed.
T. Keating wrote:

PolicySpy writes:
Lawn mowers have throttles. When the thottle is set too high it just reaches choke mode and the air/fuel ratio is then too rich for the mower to run. Mowers cut grass at their maximum throttle setting and do not vary engine speed while cutting grass.
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I see you snipped my link.. http://www.husqvarna.com/us/products/robotic-mowers/automower-solar-hybrid /

Huh... 36 Wh... are not large batteries. Especially if a robot is doing the work.

no,.. you obviously haven't repaired any lawn mowers lately. . If they ran full out.. the engine would soon destruct.. hint.. They don't run full out..
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T. Keating wrote:

PolicySpy writes:
A lawn mower cuts grass at its maximum throttle setting. The throttle setting is available to the user of the lawn mower. Too much throttle setting just reaches choke mode. Any underlying system to even-out the engine at maximum throttle setting is not the issue and is a superficial point.
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A lawn mower cuts grass with a constant engine speed setting. A riding lawn mower changes riding speed by changing gearing. The new hydrostatic transmissions change gearing more easily.
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