Hi all, I'm new here but have been flying an ARC Jupiter (before Thunder Tiger took over production for a few years) since July 2005. Managed over 1,500 flights with the original fuselage & wing and 2 Irvine 53 engines.
Last time she flew the very tired fuselage didn't take the strain of a forced landing (engine failure), but the wing was unmarked. So, having a spare "shell" fuselage, I went big - transferred servos, linkages, battery & receiver, fuel tank, vertical fin & stabilizer from the old fuselage, but instead of the .53 engine, I made a custom firewall out of 10mm thick multi-layer plywood and fitted a nearly-unused Irvine .72 engine in her, with a 14x6 prop. Today just balanced her, only needed some 75 gramms at the bottom of the vertical fin, and she balanced fine, battery was brought just in front of the wing support bulkhead instead of normally being underneath the fuel tank.
Worth mentioning, I introduced about 2.5 degrees right - side thrust to counteract the significantly increased torque of the Irvine .72, but left the down-thrust unaltered.
Engine runs will commence soon hopefully, adjustments etc... cannot post a video link showing her amazing maneuverability here when balanced @ 90mm because I've got only one post...