In addition to the problems described in the last article, there are many other things that could go wrong with your RC helicopter. If your helicopter starts to vibrate and shake when flying at low speeds, it can look a bit disconcerting. There are a few things you could check out though, to locate the problem.
Again, you should first check the balance and tracking of your helicopter’s rotor blades. Also, you should check that the blade grips are spaced evenly away from the head, and that the blade grips haven’t shifted too much.
You can also check the flybar to measure the distance out from the centre, making sure the paddles are screwed in the same too. Check that the head, flybar or spindle have not been damaged or bent in any way. The main shaft may be bent, but it would have to be removed for you to check this out.
If you have been experiencing shaking when flying the helicopter at a higher frequency (100-300Hz) then there are just a few things that could be causing this to happen. These include;
• The crank shaft or the start shaft may be bent
• The clutch may be damaged or unbalanced
• The cooling fan may not be balanced correctly
• There may be a problem with the tail blades or tail mast
• You may have damaged the pinions or drive gears.