Had a BeeTween several years back. Had a Black Widow on it with lots of throw on the controls. Flew well except when pulling a high-G turn, that single spar on the wing bottom folded like an umbrella. Exit one BeeTween. Strongly suggest that 3/16 or 1/4 inch top and bottom spars be substituted for the half height single bottom spar with full depth shear webs to 2/3 rd span. Or a full depth spar with 1/2 depth cut outs in top of spar for ribs with 1/2 depth cut outs in bottom of ribs to fit together. Also found like many of Randy R planes that the nose could be extended by 1/2 inch to ease tail heavy condition.

Easy to build. A sure start today with a 5x3 Cox prop and a film can tank and it would be a real fun flyer. But change the wing spar.

Jim H