I am in the final stages of purchasing a flying RV with a modified O-320 engine and Sensenich propeller (2600 RPM propeller redline). The engine was built by a (supposedly) reputable engine builder (not an advertiser on this site) and furnished with a dyno sheet that makes no sense to me. My formal training is as a mechanical engineer, my experience is automotive engineering design, test and development and I have personally been involved in dyno testing. I also forwarded a copy to an engineering friend who has spent his entire career in engine development and the dyno information didn't make sense to him either.
The builder has refused to return 3 (polite) telephone calls and 6 e-mails requesting an expanation of the information.
I do not believe that the current propeller is a good match for the engine/airframe because of the RPM restriction. There are many folks on this forum who have done a lot of testing. Since this is a flying airplane, could you knowledgable people please chime in with some advice regarding how I might conduct some flight tests to help a propeller manufacturer furnish me with a prop that is a better match.
For example could I seek altitudes where the plane would run WOT at various engine RPM, say 2200 - 2600 in 100 RPM increments and deduce horsepower from measured air temp and baro data?
Thanks a lot,
Larry
The builder has refused to return 3 (polite) telephone calls and 6 e-mails requesting an expanation of the information.
I do not believe that the current propeller is a good match for the engine/airframe because of the RPM restriction. There are many folks on this forum who have done a lot of testing. Since this is a flying airplane, could you knowledgable people please chime in with some advice regarding how I might conduct some flight tests to help a propeller manufacturer furnish me with a prop that is a better match.
For example could I seek altitudes where the plane would run WOT at various engine RPM, say 2200 - 2600 in 100 RPM increments and deduce horsepower from measured air temp and baro data?
Thanks a lot,
Larry