FlyBoy1960

I know the aircraft was an absolute disaster for everyone but to think a two cylinder two stroke engine producing 70 hp could send this along at 200 kn and get nearly 2000 ft/m climb rate at sea level, just amazing

Not blaming you, just saying it doesnt make any sense.  You would expect it to be at least another 1,000 fpm on top of what is written otherwise with a hang glider on the back it would only do 100 fpm, hardy an efficient launch vehicle. 

there must be something wrong in the specifications. It says that the aircraft is designed for Aero towing and the 80 hp engine is the minimum but the climb rate is terrible. 550 ft/m with one person. This would certainly not make a good aircraft to tow hang gliders. Perhaps it is a mistake in the specifications?