ChopperAddict's Hints & Tips


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   INFORMATION - How tightly should you pinch the main rotor bolts

There is quite a bit of misunderstanding about just how tightly the bolts that hold the main rotors to the head should be.

Some people are surprised that it even matters, but believe me, it is a very important setting, and one that you need to check regularly if you do not remove your main rotors each time after flying. (Why don't you, its a safety check)

The best rule of thumb as to how tight these bolts should be is a test most of us use today.  To perform this test, attach your main blades, and then turn the head so that the blades are at 90 degrees to the helicopter frame.  Pick the helicopter up and then hold it by the tail.  Both main blades should NOT DROP BY THEMSELVES.

If they do drop by themselves, tighten them a little and try again.

If they don't drop by themselves, give the helicopter a single little shake down and then up, and see if they start to fall then.  If they do, you have it just right, if not, loosen them and try both tests again.

Why is this so important you may be asking ?

The first reason is that if they are TOO LOOSE, they will probably lag behind the blade grips as you spool the helicopter up, and this is quite likely to lead to both blades hitting your boom.  To prove this, rotate one of the blades in the grip as far as it  will go in one or other direction and then repeat with the other in the opposite direction.  Now slowly rotate the head with your hand and look where the blade tips are !!!!!!  The same will happen as you spool down again after landing.

The second reason is that the blades are a very important part of the aerodynamics of a helicopter, and they need to be able to adjust themselves to be at exactly the correct angle in the grips as you spool the motor up.  If they are to TIGHT, they will not be able to do this, which will lead to bad vibrations, very poor lift characteristics, bad rotor blade tracking, and a generally very unhappy helicopter.


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