RE: Balsa USA 1/3 Scale Sopwith Pup
here is what i found with mine,
1. dont use the supplied clevises for the flying wires, they will come loose in flight during aerobatics use dubro # 302 instead
2. silver solder the flying wire fittings-not silver bearing solder, and not your normal acid core solder
3. change the flying wire fittings at the cockpit (upper wing rear wire attachment at the fuse) as designed they are attached at the ply sides, and will pull out, either add a bracket inside to the fuse former or run a support clear across the fuse to the other side
4. mine started at 31 lbs rtf was tough on windy days, once i increased it to 37 lbs rtf it totally changed the windy day effects, i have flown in 25 mph winds with gusts to 35. tail up landings work best keep speed up and chop throttle when on the ground. blip throttle if it trys to nose over. i will now even do cross wind take offs and landings. get used to using that rudder ALOT, this plane LOVES rudder, much more effective then ailerons.
hope this helps