I have the new version on this Phoenix Extra and the manual is for an OS 91. My engine is just a little larger than an OS 91 but the stock motor mount that came with the ARF did not look like it would hold up to the Magnum 108A so I went ahead and used a GP adjustable mount. I just had to relocate the bottom 2 blind nuts. I could nut get the 120mm location with this mount and the engine is at 135mm out from the firewall. I will have to move everything inside the fuselarge back some to get the proper CG. The new version has the CG at 100mm and not 120mm.
