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1. 04:16 AM - Re: RotaxEngines-List Digest: rpm-prop pitch-vne (Thom Riddle)
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| Subject: | Re: RotaxEngines-List Digest: rpm-prop pitch-vne |
--> RotaxEngines-List message posted by: Thom Riddle <jtriddle@adelphia.net>
John,
For the sake of accuracy, the 912S produces 100 hp at 5,800 rpm and 95
hp at 5,500 rpm. Pitching the prop for a max of 5,5800 gives you 5.3%
more power. The 912UL is 81 hp at 5,800 and 79 hp at 5,500 or an
increase of only 2.5%. Is it worth it? Yes, if you operate at high
density altitudes, near gross weight, or from short air fields.
Otherwise, maybe not.
Each owner gets to decide for himself. Since we don't operate often in
those conditions, we like the extra security of knowing that the engine
will never go over redline without doing a full throttle descent, which
in our airplane would risk going over Vne as well. Have you read what
Rotax says you are supposed to do if you go over redline? Not worth the
risk in my book when the little extra power will not make a meaningful
difference in our normal ops.
Thom in Buffalo
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