I posted this in the wrong thread.. but nobody noticed anyways
For the sake of continuity I copied it over here where it belongs.
Let the butchering begin. The engine looks a lot bigger when I place it in the mount, that's encouraging. The airframe seems more and more suitable the more I putz with it.
I have to get out the epoxy filler and very slightly blister out the sides to accommodate the mounting lugs. Then to form the half cowl underside the engine, then an exhaust tunnel, then time to get out the profile plates and plasticine to form the plug for the top cowl. Should look like something in about 6 weeks..
Update: this morning, said a bad word or two, then scraped out all the semi-cured epoxy filler and backshelfed the containers - too much settling and crystallization so it ended up off-ratio. Should have reconstituted it properly first. Cleaned off with solvent and sandpaper and started again. Mixed up a different batch of lite epoxy filler and redid it. It's curing suspended over the woodstove at the moment, it's overnight cure rate stuff so now to patiently wait until the morning to break out the sanding block.
[ATTACH=CONFIG]1954298[/ATTACH] Hurry up...!
It was very evident from this placement that mounting to the stock firewall would have resulted in a forward CG even with the battery and elevator servos stuffed as far back as possible. So a bit of extra work is worth it. Net I'll cut a ply profile plate to screw to the mount, that tapers parabolically to the prop driver OD, screw it down and use it to shape the lower section of the cowl from lite balsa. No need to go silly with composite for this part, I'll just hollow it and apply 3/4oz glass.
I still think a very small Al spinner would be better, but the smallest I can find is the 1" from Brodak. For 3.8"-4.2" dia this is a bit big I think.