IO originally stated;
“The performance is about the same as other fixed gear planes of that HP and weight and cockpit cross-sectional area.”
englishal if your figures are right then the thing is massively slower! A DR400 would be 17kn faster on the same power! My tests were run at 75%, but it was back in the 90’s and the TB was in very good shape. The prop appears to add complexity without making up for what I assume is poor aerodynamics. I do not remember the w & b, is the TB a true 4 seater ?
Rod1