So what's wrong with with this 0S 91?

* 2.8 HP
* multiposition NV
* O ring seal on NV prevents setting creep and air leaks
* Low profile = more cooling fins on head
* Dual BB with the larger bearing in front

Build the F-16, install the engine and fly it already.

You might find this useful:

http://www.rcmf.co.uk/4um/index.php?topic=67306.0

Bill