Mamo Models Variable Pitch Propellor 9"
Upside-Down Variable Pitch Propellor (VPP) Units – Mamo Models of Germany makes an elegant, light, well-engineered (and simple) device which can use almost any motor and servo to provide for 'extreme' 3D (4D?) flying like we've never seen before! Unlike other designs, no hollow shaft is required for the motor and the servo has it relatively easy with simple mounting procedures and a high leverage linkage arrangement. The Units come with one set of 8" blades and one set of 9" blades. 9" is typically run with 2S and 8" are typically run with 3S. Pilots Stateside are 50/50 on what they are running right now... Some insist on 8" and some insist on 9"!