Could you take a measurement from the cranck centerline to the fuse? I have been thinking that a couple of RCV 90sp's would be great in this airframe along with a Kelo (sp) exhaust system. They swing a big prop at lower rpm's, but the props that they want (3 blade) may actually be too big. If not the 90sp then maybe the normal RCV 91 as it still has a short crank-to-head dimention due to the rotary valve system that they use and as such could possibley be totally cowled in. Thanks!