Hi Paul,

          A friend of mine recently bought a single rotor 13B from America. It is out of a quickie two, the unfortunate owner ground looped it during a high speed taxying manoeuvre, breaking the canard. I think it scared him. The rotary was mounted "plugs up" (why do they do it?). It has a ross box on it and we needed to turn it thru 90 deg. It is the first ross box I have seen that turns the same way, so while it was off I thought I'd take a look to see how he did it. It was not good. It has three bolts holding the planet carrier to the drive plate, all of which were loose, VERY loose !!! I suspect they would have worked loose during idle as the bolts go down thru these rectangular slots in the carrier with just a thick washer on top, NO locking system at all. I shall make up 3 stepped spacers of the correct length for the 7/16 NF bolt and wire the heads, what do

you think ? As you can see the ring is retained by four roll pins, is this a good idea ?

          cheers Chris Hoskins.

The role pins are a good idea. They act like 3 keyways. At that radius the load is
low. This was back in the days when people were lucky to get 150 HP.

Paul Lamar

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