But did you notice a change in rate of descent when you
repositioned the prop? The rpm may not change but it should
change the blade angle and thus the drag.



--
James H. Macklin
ATP,CFI,A&P

"Al" wrote in message
...
| Jim & Dudley, I've a question I've been meaning to ask.
|
|
| "Jim Macklin" wrote
in message
| news:yZS2g.6789$ZW3.6526@dukeread04...
| The prop governor controls within a range and should
hold a
| steady rpm within that range. When the run-up is done
at
| say, 2400 rpm the prop should be cycled to the minimum
rpm
| and allowed to stabilize for a few seconds to check that
the
| governor is working properly. On a multiengine airplane
the
| prop should be reduced to just outside the feather
detent
| and allowed to run for several seconds to be sure that
the
| prop isn't feathering at the minimum governed speed
[usually
| 2000 rpm on most piston engines].
|
| What is the minimum governed speed on a constant speed
prop?
|
| It has been my experience that below 1200-1400 rpm
someplace, a C/s prop
| will no longer cycle. In a glide, the RPM is generally
below that. In
| another thread, some time ago, you(Jim) mentioned that to
get the best glide
| out of a single engine(without the engine), one should
pull the prop control
| out fully. I have tried this in a Mooney 201, and could
not make the RPM
| change a bit, (Power off, best glide).
|
| Have any of you ever been able in influence a glide
with the prop
| control?
|
| Al
|
|
|
|
|