O-200 in BC12D; Motor Mount

[barnstmr]

Re: O-200 in BC12D; Motor Mount

Terry,
How hard would it be to get approval for a motor mount that instead of being 4" longer than the short mount, was only 3 3/8" longer? As part of the STC I got from Mr. Harer before he passed away, I received a drawing to make my own motor mount. Even without the drawing it isn't hard to do if you use the original short mount bolt pattern as a guide. I bet if you could get approval for this, it would sell like hotcakes. Then you could use the original O-200 motor mounts and still fit within the cowl.

Richard...
This approval could be done, but as with any FAA approval would require substantiation. Help me understand your issue because I don't follow your logic. The original F19 (O-200) mounts are 4 inches longer than the BC12D mount/cowl. As I see it, 4 inches or 3-3/8 inches... either way you have to extend your BC12D cowling. I sell the drawings for the mount also as you have, but people rarely buy the drawing because you can purchase a BC12D-4-85/model 19 PMA mount from Univair or Wag Aero.

The discussion here really pertains to using a short mount as used on a BC12D-85. In this case you can use these adapters being discussed to have minimal baffle and cowling changes from a stock BC12D

[Robert Lees]

Re: O-200 in BC12D; Motor Mount

Back when I started this thread, I wanted to fit a brand new O-200 which I had bought.

The idea was to fit it on the existing A65 mount, using 337 data that I acquired from folks on here and the mounts to which Terry refers (which are, or were, available on ebay).

The 1969 Rolls-Royce O-200 I bought was in pieces (literally) but had never been used. It was in perfect condition.

The UK didn't allow it (requiring a design study of the horsepower/torque upon the forward fuselage structure) . In the interim, requiring new cowls anyway, I designed my new cowls to be 1/4 inch fatter and a gauge thicker for additional durability.

In the end and due to the paperwork difficulties, I went for the 85. and sold the RR O-200 for a reasonable profit, having had it reassembled & certified..

I think the end result might probably be the best outcome, performance- and financially-wise.

Rob