Quote:
Originally Posted by Wolf_Rider
its like this:
A helicopter had to have the tail rotor put on it for what reason?
that's right... to prevent the main rotor and the main body (housing the engine) from spinning in opposite direction.
double main rotor 'copters spin in the opposite direction: why?
and there is no prop on the ever popular car anology, when the engine is revved hard causing lurch.
piston drives the cranshaft which turns the prop. the piston moves down bwcause the explosion, which causes the movement because it forces the piston to move down using the block/ head as the base. the engine block is mounted securely to the vehicle, etc, etc, etc
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helicopter have main gearbox fixed in the body which turns torque threw 90deg, so the engine has little to do with it with regards to its own flywheel effect as the load from pushing the blades one way is put into the main body by the gearbox case wile the tail rotor counters main body yaw and engine only counters input shaft load and is 90deg out of sync with you example!
If your then talking about vehicles like cars, trucks etc, agene the engine is mostly fixed to the gearbox which has its own mounts and the small amount of rock you get from sharply revving the engine when there is no load is minuscule in comparison to the amount of torque from the gearbox output shaft which will in fact twist the gearbox case and thus vehicle body/chassis the opposite way wile the engine that is rigidly fixed to it is only countering a smaller input shaft load.
Also with gearbox in the equation with lower output ratios resulting in increased output torque (like trucks, helicopter, turbo-props, etc etc etc) if you input say 500NM and get out 1500NM then ware dose the difference in output torque have an effect and ultimately go, via the gearbox case into the rest of the vehicle by any chance wile the engine is only countering a smaller input shaft load.
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So forget the engine we are only interested in ware the force from pushing a prop one way ultimately ends up!
Quote:
Originally Posted by Wolf_Rider
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you are 19 post behind
The effects of gearbox and high load and a vehicle twisting in the opposite direction to its propshaft
04-17-2011, 03:00 PM
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