Hey everyone, I've got a dilemma. I'm in a quad-copter competition and the specifications look very odd. b. Rotors i.Maximum length (tip to tip) = 6 in. ii.Metallic materials are not permitted. iii.Rotors must not be sharpened to a point. c. Motors i. Maximum angular speed at rated voltage (no load) = 7200 rpm. ii. Maximum propeller to motor gear ratio = 5. d. Power: i. Maximum output voltage = 24 V. ii. Maximum capacity = 2400 mAh. Simply, with those rotor sizes and that maximum RPM, we don't see any way to get lift on this. Gearing is not an option for my team. We have a 250 quad kit with a 2 cell battery, 920kv motors (aprox. 6600 RPM), and 5-inch 6-bladed props and we get no liftoff. Some insight would be greatly appreciated! This is for the Science Olympiad Quadrotor event.