ORIGINAL: RCSUPERCUB
I just bought this plane today brought it home and plugged in the battery to test the motor to what it was like and i get this awfull loud vilent vibration form the motor, when in full power it does this and i can see the nose is moving around a bit, so i took it back to the hobby shop and got them to look at it, they took it all apart and all was good with it, they tested it and it worked fine, so i took it home and tried it again and it does the same thing again any ideas ??
Take your propellor off, and put it over a small screwdriver shaft (the little screwdriver that comes with the plane is good). Make sure it is balanced. If one side drops from level, use fine sandpaper or a small file to file a bit off the length of the edges of that side until it balances. Then reinstall and see if that helps.
The thing does provide a bit of power and may move a bit at full throttle on the bench cause it is "raring" to go. However, violent vibrations indicate an unbalanced propellor or bent motor shaft. The latter is unlikely if you haven't yet crashed it. However, propellers are often out of balance from the factory.
Also, check your motor mount screws to make sure everything is tight and secure. A loose motor mount will cause this.