larywil(at)comcast.net
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 Posted: Tue May 17, 2011 10:15 am Post subject: Engine Operation |
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Hi gang,
I have had a question about the operation of my RV-4, IO-360, with
old style Hartzell prop for the past ten years. I posed this question
to the list once before, but received little response. I talked to
Lycoming yesterday, and got an interesting, but not definitive, response.
So here goes: The older Hartzell prop has a limitation of 2100 - 2350
continuous RPM ( due to harmonics), and I have always kept the RPM in
the 2400+ range when slow cruising at 18"-21" MP. A very experienced
co-pilot felt this was a "sweet spot" when flying my plane. Only
recently, have I experimented with 18"- 21" x 2100 RPM. Yes, its
quieter. But it feels strange. Lycombing assures me that this is
perfectly fine. They also say that my original 2400 RPM settings are
fine, and do not impair the life of the engine. It feels as though I
am lugging the engine. Lycoming assures me I am not. My gauges assure
me I am not.
I just want to know what other RV pilots have experienced, and how
they like to fly behind this engine/prop combination.
Thank you, and good flying.
Louis
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