Hi All,
Statistics: RV-7, Superior IO-360, Hartzell C/S, dual Slick mags, 490 hours on all.
Recently had mags rebuilt, plugs changed, hub greased. The plane has an aluminum spinner. I didn't build the plane so I'm not sure where the builder got it from.
I have previously had dynamic prop balancing and at cruise setting (22 MP, 2350 prop) all is wonderful. All flight parameters are smooth but between 800 - 900 RPM there is a pretty significant shake.
At idle all is smooth, above 1000 RPM all is smooth but when on the ground and I pull the power back to that 850 RPM zone, shake, shake, shake.
The spinner is the original one from 2006, there was no shake prior to the engine work. When I remove the spinner and ground run the engine, no shake, just like it use to be.
My mechanic says to change the spinner but I would like to try something before I scrap it. Some say live with it as it is only in that small range that the problem occurs. I bugs me though as the engine was never like this. Usually upon start up the engine would run like a sewing machine!!
How do I dynamically balance the spinner ? Probably can't ?
Will doing another dynamic prop balance help at this low RPM ? Or is that primarily for cruise settings ?
Is it a result of the recent engine work and some harmonics at this RPM ?
Has anyone else with an aluminum spinner had this issue ? I've inspected the spinner and hub for cracks and there aren't any. All screws are tight too.
I need some help and some ideas if anyone has any.
Thanks,
Darren
Statistics: RV-7, Superior IO-360, Hartzell C/S, dual Slick mags, 490 hours on all.
Recently had mags rebuilt, plugs changed, hub greased. The plane has an aluminum spinner. I didn't build the plane so I'm not sure where the builder got it from.
I have previously had dynamic prop balancing and at cruise setting (22 MP, 2350 prop) all is wonderful. All flight parameters are smooth but between 800 - 900 RPM there is a pretty significant shake.
At idle all is smooth, above 1000 RPM all is smooth but when on the ground and I pull the power back to that 850 RPM zone, shake, shake, shake.
The spinner is the original one from 2006, there was no shake prior to the engine work. When I remove the spinner and ground run the engine, no shake, just like it use to be.
My mechanic says to change the spinner but I would like to try something before I scrap it. Some say live with it as it is only in that small range that the problem occurs. I bugs me though as the engine was never like this. Usually upon start up the engine would run like a sewing machine!!
How do I dynamically balance the spinner ? Probably can't ?
Will doing another dynamic prop balance help at this low RPM ? Or is that primarily for cruise settings ?
Is it a result of the recent engine work and some harmonics at this RPM ?
Has anyone else with an aluminum spinner had this issue ? I've inspected the spinner and hub for cracks and there aren't any. All screws are tight too.
I need some help and some ideas if anyone has any.
Thanks,
Darren