Shellydog, I have built and still fly this plane. I also have built the trainer. Both fly very well, and can take one heck of a beating. I strongly suggest that you build your colt with the 58" sport wing option, makes it much more aerobatic. Fly with low rate elevator and high rate ailerons settings. Put the rudder to the max throw and with 2 oz weight in the tail. At these settings this bird will do the best flat spin ever seen at half throttle. Give yourself plenty of time to pull out of it though. If I can be of any help, please just ask. I love this plane, my first plane after my trainer. Also I have the OS 46 FX with a 11 X 4 APC prop on it with the baffle removed from the muffler. I have a tuned pipe on the way, can't wait to try it. Sorry I do not have the details on the wing spar, but if I can be of any other help, just ask.

Richard