ryobi vibration??
 

Ok guys this is my second conversion engine a 31cc ryobi to go into a 1/4 spacewalker any thoughts on this plane/combination? but the real question my motor seams to have a heck of a vibration near 3/4 throttle seemingly smooth on the bottom great idle and on top runs out strong. I have faced the flywheel aff and have balenced it in my prop balancer as well as the prop. I know that this is a hard thing to ask as I cant be specific about how much vibration but is this the nature of the beast at this throttle setting or should I keep looking for a cause thanks a bunch for any and all comments

RE: ryobi vibration??
 

looks like a case of plane structure resonance. (or maybe even rich burble)
Engine unbalance will work out over the whole rpm range. Hardly probable with a Ryobi.

RE: ryobi vibration??
 

Try the prop in different positions on engine. Have you also checked the prop tip to see if its running true. If you have a non-wood prop...try a wooden prop. also is the engine running rich at the worst viabration. All things to check. Good turn-out I hope. Capt,n;)

RE: ryobi vibration??
 

thanks for the help guys. I do have a master airscrew prop and do like the romance of wood so maby give that a go. But if it was an imbalance it would show through the entire rpm range and not just rear at the 3/4 throttle setting? Makes sense so could be a tuning issue? ok enough rambling to the shop thanks again guys any other ideas. Will this be a good motor on the spacewalker?

RE: ryobi vibration??
 

It should work out fine. Hope you can tame vibes down. Maybe on airplane...it will seem better???? Capt,n

RE: ryobi vibration??
 

thanks capn the wood prop seems to calm it down a bit and I belive that I may be causing a resonance though the radial moun that I made going to try to stiffen the mount up tomight and tey to get it mounted later or tomarrow again thanks for the help and encouragement

RE: ryobi vibration??
 

Just wanted to update you guys I have found that my radial mount that I had made was allowing a resonance (as was mentioned) made a new mount last night and ran two 16oz tanks out seems great. I am a bit worried that it will be heavy but just fly faster and smile right??

RE: ryobi vibration??
 

If the tail seems to viabrate....make sure to use some kind of braces like from near top of vertical stab to horizontal stab. Good Going Capt,n