Hi Mark,

 

You have several projects in works…getting your drive plate back together, building the PP 20B.  How are you progressing?  How about an update?  On both projects.

 

Regards the rivets loosening.  You are one of the few with a constant speed prop.  I am assuming that when you dial from takeoff prop to cruise prop, the plane would surge forward with acceleration and the engine would reduce rpm as the prop starts to bite.  That would have put a lot of force on the rivets.  This, along with you more powerful engine, could have been a player???  If so, those quarter inch bolts should move the weak spot up the chain to wherever the next weakest link is.  That, hopefully, may be above your operating envelope.   :>)

 

Bill B