Blade 400 - Good Good Good, Vibrations.....not :)

[dam74]

Well since my crash a couple of weeks ago I've replaced a lot of parts but since doing so I've noticed tail boom vibration when getting close to lift off throttle/pitch. I took it down to the Southampton meet and Dan tightened my belt which I was hoping was going to eliminate this vibration but it still exists. Since then I've managed to hover it but while doing so I can notice a definate vibration in the tail. Tonight while watching TV I decided to remove the main rotor head and just leave the tail assembly attached. Throttled up to easily past center stick and there was no vibrations whatsoever. What do you think could be the problem, should I try another head to see if that is the cause? Or could imbalanced blades do this? I'm extremely new to this hobby and any help would be appreciated. I know I've been quite opionated about the MSR but that was because I annoyed about bang for buck. Anything in regards to larger size helis I'd appreciate your input.

[spunkmyer]

Just a long shot have you checked things like the flybar is equal lenths the paddles are level, main blades are balanced, main gear is not warped also check to make sure the motor pinon is not loose.

[dam74]

Spunkmyer, I've remove the head and there is no vibration so I'm guessing motor pinion is out of the equation. I'm going to replace the head minus the blades, which should mean either flybar/paddles, the cage, the head or the blades. Will put back on until the vibration returns.

[dam74]

Just performed a test with head on with flybar no blades. Very very minute vibration as opposed to no head. I will try another test with the blades, my guess is the blades are out of balance?

[spunkmyer]

Keep at it you'll get there, are these new blades

[dam74]

Yes I replaced the stocks with new woodies as I had a crashed. The new woodies have no balancing tape.

Just put the new on and revved up on my coffee table. Vibrations galour. Changed them over for the stocks which I've banged about and split the shrink film. I've glued this film back down. Revved the original blades back up and they sounded different but zero vibration. I guess I need to get a balancing tool and some tape to tweak my new woodies.

[3d_willz]

hi i would make sure that the main mast and the feathering spindle are not bent either of these will cause a vibration you wont need to replace all the head.
mark

[dam74]

After a stack I've replaced the feathering and main shaft as they were bent. I changed quite a few things such as o-rings and main blades also. No bearings. It's a good possibliy that this vibration could be due to unbalanced blades.

[3d_willz]

yes it could be the blades are they wood or carbon also make sure the blades stay in track while the heli gets into hover.

[dam74]

Willz, they're woodies and they seem to be tracking OK from looking sideon with low throttle. Nice collection that you have by the way