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B2 - Belt
CP - How
do you change the Feathering shaft ?
feathering shafts are designed to deform (bend)
on a crash or even heavy landing where the main blades can be forced
down far further than you might expect.
On the Belt
CP, the first thing to do is to remove the main blades by undoing
the single socket headed bolt that holds each of them in place. Make
sure that you also remove the nylock nut underneath, as this is only
a light press fit into the bottom of the blade holder, and can
easily fall out and get lost.
blades have been removed, disconnect the arm that goes to the main blade
the blade grips, and you will see a small 1.5mm cap holt that holds
each end of the feathering shaft. Loosen and
remove one of the cap head bolts, and pull the blade holder outwards
until it comes off. Normally you will see that there are one or more
small spacer washers left on the feathering shaft, so carefully remove
them as well and put them aside carefully and keep them together. The next thing is to simply pull the other blade holder
out complete with the feathering shaft. Now this can be a
problem if the bend in the feathering shaft is on the side of the
blade holder you have already removed. If it will not come out, hold
that end of the feathering shaft with a mole wrench or similar tool
and then undo fully the cap head screw on the other end so that you
remove that main blade holder first, and then simply pull the
feathering shaft out from the other end. Don't forget to find
the little spacers on that side as well. Finally, check
to see that the damper rubber rings ( "O" rings) are still
in the main head casting. There are 2 of the damper rings, one
on each side. If they are still in the head, remove them carefully
so that you can inspect them.
damper rubbers carefully for any signs of excessive softening, or
cuts caused by the carbon spacer. If you think they need replacing -
DO IT, these are important.
Take your new
feathering shaft and put a cap head screw on one end and wind it in
about 1/2 way. Don't forget to put some thread lock on it as it is
screwing into metal. Next take one of the
main blade holders and slide the feathering shaft through from the
outer side (blade side).
Once the blade
first holder is on the feathering shaft, put one one set of the
small spacers on the shaft. Have a good look at them for you
will notice that the one that was sitting nearest tot he blade grip
has a small ridge on it. This ridge MUST be placed so that it
runs against the blade grip bearing. The other spacers go on AFTER
that ridged spacer.
Check that you have
a new or good damper ring in
place in the head, or else put them on the feathering shaft as the
last item so that the spacers will push them into the head
recess. Push the feathering shaft all the way in. Now put a damper
ring on the other end of the feathering shaft if they are
not already in place in the head followed by a the NON ridged spacers
and then the ridged spacer, again with the ridge facing the blade
grip bearing. and then slide on the other blade grip. Use a
1.5mm hex driver to
start the other cap head nut into that end of the feathering shaft.
Don't forget the threadlock !
gently tighten both bolts up while constantly checking the free
movement of both blade grips. You
will need TWO 1.5mm hex drivers to do this job. Once the blade
grips start to feel a little tight, back them off very slightly. The
blade grips should be able to rotate freely but there should not be
too much "rock" of the feathering shaft across it's length
Finally reconnect the connecting rod to each blade
holder and refit the main blades.
DONE - IT REALLY IS THAT SIMPLE.
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