Danny Starkey, the king of .21 powered jets, did a conversion of this to a .21. There's an article about him and his .21 planes (with lots of picts of the .21 rafale) in RCJI a few issues ago. He's been known to get 150mph+ out of his .21 jets.
Email him at
[email protected] or check out his website at
http://www.dannystarkey.freeserve.co.uk/
Good luck!
Russ
[email protected]