kingaltair: In Don's article he cites several negatives of excessively-swept wings. The biggest is an abrupt stall. Not one to be "dragged in" on base to final. In addition the sweep makes it more difficult to spin and snap-roll. He goes on to say the Phoenix 1 balanced according to plan may not spin at all, requiring the cg to be moved rearward slightly. The benefits far outway the negatives, with the penetration you mentioned, increased lateral stability and roll rate, and smooth control "feel". I'm a third of the way through with a scratch-built "1" Looking forward to it......Mark