Pascal
Senior Heliman
Location: Paris, France
| The best way to prevent it to fall is to eliminate sources of vibrations.
On the 3DNT I saw, some had small vibrations because :
The AC belt was not tight enough, this one is the most common,
The rotor speed was not right, there seems to be a resonance around 1600-1650 rpm, so if you see small vibrations, try to increase slightly the speed of the rotor
The AC belt is twisted inside the boom, 1/4 of turn is required, but I saw more than once 3/4...
The flybar is unbalanced, due to mispositionning of weights or of the paddles,
the paddles are misaligned...
Last, the fin falled already at least once and was glued again without cleaning and removing the old glue.
It is anyhow a good idea to drill to holes in the vertical fins and add two tie-wrap to secure it.
Pascal
Pascal |
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in fact there was no shake at all except in the highest head speed where it was visibly present and that was only used for 'extreme hot doggin' which I don't really do all that much of 
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i might give this a go
