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A4 - Interceptor
400 - How
do I change the direction of rotation of the tail rotor ?
direction the that the tail rotor moves can be done in two different
In my view by
far the easiest way is to change it at the front by removing the
boom from the helicopter completely. To remove the boom you just
need to undo the two long screws that hold the bottom of the boom
clamp together. These have 2mm nuts, usually on the right side
of the frame. Next undo the 2 screws that holds the horizontal
stabilizer in place so that the boom can slip through it, and
finally disconnect the plastic tail pitch control rod connector that
you will find at the back under the tail casing.
who built your particular Interceptor, you may also need to remove
the 2 self tapping screws that hold the INNER of the two boom
supports frames in lace so that the complete boom support can move
back and forwards as well.
Now that the
boom is loose, push it inwards a little so that you can lift the
tail drive belt off the small gear that it goes around behind the
mainshaft. Pull the boom backwards until it clears the 2 boom
You will be
able to see that the drive belt is sticking out of the front of the
boom. Care needs to to be taken here, as the belt has to be
rotated through 90 degrees (and no more) in the correct direction so
that when lying horizontal at the front, and rotated /ANTI
CLOCKWISE, the tail rotates ANTI CLOCKWISE as well when viewed from
the right side of the helicopter.
If you happen
to turn the belt more than 90 degrees, you can usually feel the
teeth catching each other. If so, turn it back until it is vertical
and does not show any tendency to want to turn by itself, which
usually indicates it is then parallel all the way down the boom.
I like to try
pulling the bottom of the belt at the front and watch the tail
rotate. If the belt seems free, and the tail rotors are turning ANTI
CLOCKWISE, then simply turn the belt 90 degrees CLOCKWISE when
looking at the boom from the BACK. This will be the correct position
for the belt to be fitted over the drive pulley.
Refit the boom
carefully, making sure the belt dos not turn any more, push the boom
in as far as it will go and carefully fit the belt over the tail
driven gear pulley. Now pull the boom backwards to tension it so
that when pressed gently together at the front, the two sides of the
belt cannot quite touch. Tighten the boom support clamps fully, and
refit and tighten the horizontal stabilizer.
all there is to it....
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