Yes there were three wing set ups. The straight wing set up was for a two stroke and the top swept or both top and bottom swept wing was for four strokes??? Don't quote me on that, I'm running off of brain power and my battrey may be a bit low?
Don, I made up my N-struts fron 2-56 wire and used snap ball links on the ends. They held very well and you could adjust them if you changed incidence.
About N-struts and do you need them. I had one friend that flew his without them and had an OS .70FS for power. It was an outstanding slow moving stunt plane and he never had wing problems.
I used the SK .91 two stroke in mine and had my home made struts. Mine was a pretty fast little plane and I tended to really get with it when I was stunting!! I could do flat spins and hold them forever.
Thing was after I landed I would often, very often find the 2-56 wire N-struts broken!!! I'm talking snapped in half.
I wonder what would have happened to the top wing if I didn't have the struts??
I may do the repairs and get mine back up again this winter if nothing else ends up on my bench.
Other thing, it was time to celabrate when I landed without bouncing. I even turned my LG around so they are thrust more forward and it still bounced. The one time I didn't bounce {it's last flight} I was so pleased with myself I wasn't watching the plane on roll out and I ran into the pin board!! So much for patting myself on the back!!