2006-08-25 13:36:39 · 6 answers · asked by j_mccarl 1 in Home & Garden ➔ Do It Yourself (DIY)
The efficiency of gasoline engines, lawnmower or not, is called "Thermal Efficiency". This is because they are heat engines.
Steam Engines are about 15% efficient
Gasoline engines are about 25% efficient
Diesel engines are about 75% efficient
Jet engines are about 10% efficient.
This is because most of the energy from burning gas
is blown out the exhaust pipe.
2006-08-25 13:44:21 · answer #1 · answered by Anonymous · 1⤊ 0⤋
A Push Lawn Mower Blade is attached directly to the Crankshaft of the Engine- each Engine RPM is a Blade RPM- I would say the Efficiency is 90%.
A Riding Mower- Blade is Belt Driven, probably 50% -
2006-08-26 09:11:12 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The internal combustion engine is rather ineffcient, but the constant RPM/engine speed of the typical side-valve lawnmower engine means it can be rather efficent. Combustion efficiency is around 30% or so- on par with most engines. As far as it's mechanical efficiency (I'm assuming how much power gets from the spinning crankshaft to actually spin the blade) is rather high because of low friction losses, probably around 90%, maybe even higher. If it is a self-propelled mower it is going to be lower, in the 70-80% neighborhood.
2006-08-25 20:46:00 · answer #3 · answered by yazukka 2 · 0⤊ 0⤋
Yes I agree with Tony. Mower engines are not very efficient. I'd say 25% at BEST.
2006-08-25 22:30:20 · answer #4 · answered by Anonymous · 0⤊ 0⤋
actualy 95 %
2006-08-25 20:38:46 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Who cares? I have a Mexican gardener.
2006-08-26 11:02:02 · answer #6 · answered by Anonymous · 0⤊ 1⤋