Hi Leon! I was wondering if you'd be interested in looking at designing/adding a stub wing and box tail to your tandem design? I've been looking at ways to improve speeds, improve COG issues, and increase fuel tank sizes. I think I've got an idea that would add 20-30 gallons of fuel, improve yaw control, reduce PIO, and increase speeds 20-40%. This is based on work done a long time ago on winged gyros back in the day. This would make your tandems one of a kinds instead of just really nice low cost alternates. Let me know! -- Matt