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Beware of tail blade drive shafts that are not
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 ?
SORRY - WRONG.....
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
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.
I HOPE THIS
SAVES ANYONE ELSE FROM EXPERIENCING A TAIL BLOW UP