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Belt CP answers

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B2 - Belt CP - How do you change the Feathering shaft ?

First off, 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.

Once the blades have been removed, disconnect the arm that goes to the main blade holders themselves.

Look inside 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.

Check the 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 !

Continue to 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.

JOB DONE - IT REALLY IS THAT SIMPLE.

 

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