Pete, I am glad you made it back to Leander! I missed you at Oshkosh. I walked and walked and walked, by Thursday this Old Man had had enough!
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Pete, I am glad you made it back to Leander! I missed you at Oshkosh. I walked and walked and walked, by Thursday this Old Man had had enough!
Paul, I stopped by, but you were out. I loved your plane. I want one when I grow up.
If you think the vibrations come at certain RPM, check you engine mount.
Sometimes it is hard to find the source of vibrations.
I walked by your plane. Sorry I missed you. I will probably be flying to San Antonio to see my sister soon, maybe we can get together on my trip down to Dirty SA.Quote:
Originally Posted by Peteohms
I will try the half flap trick. After some thought, I'm going to also try running the engine at various RPMs on the ground and see if I can find a range that excites some movement. With the damping from sitting on the gear it shouldn't shake as much but I think I'd observe something. If there is a consistent RPM range, I'll put a yellow arc on the tach.
And I will check the motor mount, fasteners etc again. Maybe the rubber bushings have gone soft. Thanks for all the advice, folks.
Haven't found any problems w engine mount, etc, fixed all looseness in the control system - but I think I have a harmonic with the engine/prop at about 3600 - 3800 RPM. Ground runs in that range cause some wing tip movement. The wiggle looks a lot less severe at 0 feet than 3000! :) I'm sure that's all perception on my part. My changing RPM and airspeed stopping it makes sense, low airspeed occurrence is when the RPM would be that low, and all I really needed to do was move the throttle. Looks like I need a yellow line on the tach. I'm running an HKS with the lower reduction ratio (2.47:1, I think) and an IVO 2 blade. I don't think that's a common combo, so that's probably why others haven't seen it..
Cheers,
Larry