Your thread link was interesting but much of it is a little over my head with out some serious effort. What I got out of it is that there is a lot of theory in propeller designing and the "proof is in the pudding".

help me out with this terminal velocity of a Patriot. Maybe it is me in the land of Oz.
Here are my #'s and I think they are very conservative in favor of slow speed.
6 lbs - aircraft weight
.75 sq ft - cross section - my delta is .25 so I tripled that
.08 drag Coefficient - With retracts it is fairly clean but I still almost doubled a typical wing drag coefficient.
1740' altitude - Monterrey Mexico
Terminal velocity is 297 ft sec or 202 mph
Where am I going wrong?