On 01 Mar 2004 14:03:35 GMT, (BllFs6) wrote:

It seems to me that the gear analogy is spot on. A variable pitch
prop has EXACTLY the same function as the gearbox on a car.



Dumb newbie question here...

If you have a prop that is best for cruise....am I right in assuming it has
"too much of a bite" on the air when the aircraft is sitting still...therefore
the engine doesnt have enough torque...and therefore the prop cant spin quite
as fast as it would otherwise...and both these lead to less low speed thrust
than you would like?

And if that is the case...could you not use something like water mist injection
or nitrous oxide to temporarily increase the torque the motor produces?

Probably wount make much sense if you really wanted it for many minutes of
climbing....but it might make sense if all your trying to do is shorten your
takeoff distance.....

take care

Blll

Anything that causes the engine to produce more power also causes it
to produce more heat. If the cooling system cannot efficiently rid
itself of that extra heat, you could be looking at detonation, or even
pre-ignition. You don't have to worry about pre-ignition for very
long because just a little of that and the engine is history.

The thing that to me makes the most sense to me would be to have an
engine/prop combination that works well for your application, and pay
attention to gross weight/high density altitude situations.

Corky Scott