Steve: My Alon is also a little rough in this range with either a 71-49 or a 71-52. The Alon manuals don't say anything about restricting operation in this range. My mechanic says that the engine mounts on the 'coupes and Alons are very primative compared to the ones on later aircraft and don't damp out vibration very well.
Give me an e-mail buzz and I'll be glad to give you a ride. David N6359V Alon A2 At 09:37 PM 9/30/98 -0700, Steve Dold wrote: >2) This engine has an rpm range at around 1800-2000 where it acts like the >prop is slightly unbalanced, but at other speeds it is smooth. The engine is >a C-90 with a 70-48 (I'g guessing on the 70, I don't have the book handy) >prop that has been re-pitched to 70-50. Maybe this has something to do >with it, I don't know. > >Does anyone else have this resonant vibration at this RPM range? > >When I had the prop off, I checked the balance in an amateurish way, and it >seemed perfect, certainly waaay better than the prop on my C-65, which >doesn't >have any obvious resonant shaking at any speed. > >Anyhow, just wondered if this is "normal". > > > > >------------------------------- >[EMAIL PROTECTED] >Say NO to useless over-quoting >------------------------------- > >
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