Sricketts

I have a raptor 50, that i have recently repaired after a minor crash. However when i took the helicopter out to fine tune it yesterday, i observed a vibration at a little less than half throttle. At lower throttle settings there was no vibration to be observed, however as the throttle is increased past a certain point a relatively violent vibration develops, violent enuff to render the helicopter un-airworthy. I was hoping some one could help shed some light on what might be the cause of this vibration. I don't believe that the fly bar or feathering shaft are bent, as i checked these when i repaired it. However, I have not checked the main rotor shaft as yet, but i wanted to get some feed back before i do such a drastic disassembly, as i don't believe that is the cause for the vibration as it doesn't seem to be present at lower RPM's. But I could be wrong. I would appreciate the help again guys.

thecheatscalc

check the blades, that can cause a load of problems (pitch, legnth). if it's not that I think you got a bent main shaft, of your tail could be screwed up try looking at those things, and I think you'll find your problem.

BarracudaHockey

My Feedback: (11)

Sounds like a feathering shaft. Pull it and roll it on a piece of glass, if it goes tap tap tap, thats your problem.

Main shaft bent you "should" be able to see when your spooling it up.

What did you replace when you crashed it?