If there is limitation published for your airplane (POH),
certainly follow that, but the old wives' tale about
over-square operation is part of this issue. With enough
power applied, a CS prop will reach red-line rpm on the
ground [a fixed pitch won't, it has a published minimum rpm
with a particular prop]. You reach the rpm at less than
full throttle with a CS prop, which is on the low pitch
stop. Pull the rpm back causes the governor to send oil to
the hub which takes the prop off the low pitch stops. This
at about half throttle.
You can cruise at 120 kts {just a number} and minimum rpm at
say 2000 because air loads are reduced and you're using more
power. The rpm will decrease on a ground run because there
isn't enough power to keep the rpm up and you will get to
the high pitch stop.
In any case, you should be checking more than a connection
between the prop control and the prop, does the governor
govern? On a multiengine, will it run at the power rpm as
shown on the green arc and be stable? On a single-engine,
can you set some rpm below the initial run-up and does that
run at a constant speed.


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

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"john smith" wrote in message
...
| In article
,
| "Peter R." wrote:
|
| Jim Macklin
wrote:
|
| Pulling the prop
| control back moves the prop towards the high pitch
stops.
| Most pilots seem to think cycling the prop is just to
| circulate fresh warm oil. Give the system a moment to
have
| the rpm stabilize to see what is happening.
|
| Leave it there a moment? Hmmm, when I transitioned to
the Bonanza, my
| first constant speed prop aircraft, I was told by the
very experienced CFI
| not to let the RPMS drop too much during this
pre-takeoff item or it would
| place a high load on the engine (I believe his analogy
was like shifting a
| car into 4th gear while driving at 25 miles per hour).
| Not true?
|
| I cannot remember where I read it (sometime in the past
year), not to
| allow the rpm to drop more than 500 rpm during the prop
check at runup
| rpm.