Thanks for all of the replies.

The RCU link was just what I was after, Ralph.

Will, I am looking at it for the whole fleet of piped engines that I get to play with. First there is my OS61VF 11x7 in a scratch built Subarashii (a mix of some of the Bridi designs and a hint of curare), My father-in-laws OS61VF 11x7 in the Phoenix ARF, an OS46VF to go into an aurora, an OS25VF that is in a Skymaster 20, The Hanno special in a Leo 110, and a mates Thunder Tiger 61 side exhaust in a Curare. Then of course there is my un-finished Beetle with OS61RF-P.

Matt, the info about the 20 degree dive is most useful. It is always hard to know how steep someone means when they say "a dive" shallow or steep or vertical. The angle makes it clear.

Thanks very much.

T