ChopperAddict's Hints & Tips


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      SAFETY  Beware of tail blade drive shafts that are not strong enough
I suspect that many of us take it for granted that the parts supplied with our helicopters are strong enough to perform the job they are there to perform ?


Over the last few months in my heli hospital, when repairing other peoples helicopters, I have noticed a problem with the tails when spinning them up on the turntable.

There are 2 symptoms I have seen.

1 - The tail starts to make a "burr" type of noise at around 40-50% throttle

2 - On examination, I noticed that at that point, you can see that the outer end of the tail drive shaft is no longer rotating evenly and centrally, but is instead rotating in a larger circle.

What this means is that entire tail assembly and blades are describing a circle as well as rotating, which clearly means the tail drive shaft is actually flexing at the outer end.

The only cure I have found, other than acquiring a stronger tail shaft that is, is to move the entire tail blade hub assembly INWARDS on the tail drive shaft to REDUCE its overall length from the bearing.  You need to experiment with this to find the point where the circling ceases.  The "burring" sound will also  stop when you find that spot.

This problem has caused tail blades to FLY OFF if you increase the throttle any further, plus the horizontal stabilizer can also be seen to be vibrating very rapidly.

Don't forget to reset your tail up after doing this, as you will have shortened the overall movement possible, and may need to reset the limit on your gyro as well.


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