Hi,

The flat rotor blades don't add much lift, however they do add a lot of stability. If you put lifting rotor blades, like clark Y or the SG6042 profile you may have more problems. For some reason, the air over the wing will cause one or both rotors to stop spinning. If they both stop that is OK, however one usually stops before the other and the gyro will roll over. If you want to use lifting blades, you need to eliminate the wing. Build some booms to hold the rotors from 1/2" square hard balsa. I've built many and they work well.

What kind of problem did you have that caused the crash because the Tango usually flies well as designed.

Phil