Baw... I just tried testing my new helicopter, which has both rotors free, and it started going every which way, crashed into a wall, and the top prop hook came off. Thankfully the rotors themselves stayed intact (rotors are so much sturdier than they look!). I'm just not sure why the top hook wasn't strong enough; I glued it the exact same way I've glued them before.
Also, do you find it sort of awkward to launch a helicopter with both rotors free? When one is fixed you just hold onto the motor stick with one hand and the top rotor with the other, but with this kind you need to keep both rotors from spinning...
(avatar is by xamag)
Favorite events: Anatomy, Microbe Mission, Ornithology, Circuit Lab, Helicopter