Ron.McGann(at)thalesgroup
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 Posted: Tue Aug 18, 2009 7:54 pm Post subject: Low MP/Hi RPM |
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Read an article on Vansairforce about pulling power and going full fine to slow down. Following is my question to that forum:
“Hi folks,
Following is an extract from the Lycoming IO 540 operators manual:
"These engines are equipped with a dynamic counterweight system and must be operated accordingly; avoid high engine speed, low manifold pressure operation. Use a smooth steady movement of the throttle (avoid rapid opening and closing). If this warning is not heeded, there could be severe damage to the counterweights, roller and bushings."
So, if we use full fine pitch (high RPM) with the throttle all the way off to slow down, aren't we inducing the condition we are warned against?
I am a philistine when it comes to engine technology, and I'm on a serious learning exercise on the proper management of my engine. But I would have one **** of a time slowing down my -10 without the throttle seriously retarded while maintaining cruise rpm.
A lot has been said about climb and cruise RPM/MP settings. But what are acceptable RPM/MP settings for low speed/deceleration ops and how long can these be sustained before the damage preempted in the Operators Manual is realised??”
This list has been a mine of info for me, so would appreciate your feedback on this one.
cheers,
Ron
RV-10
VH-XRM, flying in Oz
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