> So we need the amount of force needed to rotate the mechanics (crank
> shaft, bearings, etc.)
Exactly. The most correct model would be possble if we had:
- the torque required to move the mechanics of the engine, as a
function or RPM
- the torque of the combustion at as a function of fuel flow rate (and
probably mixture and RPM!)
- a proper aerodynamic model for the prop, taking into account the
region near the hub where the prop blades are angled quite steep,
which is important for windmilling I guess
Given that this is a lot of data, I doubt it is possible to obtain it
for all engines, but it's worth a try... actually, if we have a good
prop model, it's possible to measure the other two on a real aircraft,
just by varying the throttle and mixture while the aircraft is
standing still on the ground and observing how RPM reacts to it.
I guess most engines will have similar curves, we'll only have a few
parameters to adjust, so one realistic model could gain us quite a lot
of realism for all piston planes.
Andras
===========================================================================
Major Andras
e-mail: [EMAIL PROTECTED]
www: http://andras.webhop.org/
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