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After a hard crash with Radical g 20 I have problems with vibration on the vertical stabilizer.In crash has gone a lot of parts but I've replaced all but after that it is no longer the same helicopter.
At the start the vibrations on the vertical stabilizer were terrible so I again separated helicopter and I started to replace all sorts of parts to find the cause of vibration.I have replaced every possible parts that came to mind but have not accomplished anything.I checked all the bearings,I checked the clutch and it spins freely and I checked that the clutch alignment and I didn`t find anything wrong.I replaced main shaft,feathering shaft,flybar,tail output shaft,starting shaft,all of what I have thought that could create problems but now have no more idea what to do.
Is it possible that that engine shaft bent and therefore I have a vibration?I know that the vibrations of the vertical stabilizer can be caused by engine.
It is the only thing I did not check.
And just to remind you that the helicopter before it crashed was excellent vibration-free.
Can you guys make suggestions on what to do,where to find the cause of vibration.