cwalke32477 -> Balance/Vibration Issue on Blade 400 (6/4/2010 5:43 PM)
I have been flying RC planes for about 15 years now. I got bored with them, and the the whole hassle associated with flying such big birds; so I recently stepped into helicopter ;)
I purchased, what looked like a decent quality heli with a good price, and started flying. 4 crashes later I have hovering, forward/backwards/sidways flight, and even loops down pat.
My latest rebuild the heli has a really bad vibration, with associated noise. That I cannot pinpoint.
The blades I purchased are CF blades, and are identical in weight. They also track much better than the woodies ever did.
The Flybar is equal length, also with CF paddles.
And the tail rotor is also CF now.
Crash part replacements:
tail rotor shaft
tail drive gear
I had upgraded everything to CF, thinking maybe the cheap plastic and wood was off balance, creating the vibration and noise. However, I was wrong. It is still there.
At lower head speeds, this does not occur, and the heli flies very stable. But whe =n I kick into 3d mode, it becomes squirelly and makes an awfull noise. You can tail the tail vibrating
severely. At the level of vibration I get, I would imagine it will wear out and damage parts on the heli.
Does anyone have any pointers for me to weed out this vibration? I would like to start practicing some 3d stuff, however, when the vibration kicks in, it makes the heli very hard to control. Perhaps it is affecting the gyro?