Originally posted by CM_Aero
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Trex 150 = 120mm blades
Trex 250 = 205mm blades
Trex 450 = 325mm blades
Trex 500 = 425mm blades
Trex 550 = 550mm blades
Trex 600 = 600mm blades
Trex 700 = 700mm blades
That said, there is no convention whatsoever that would make this a 400 class heli to my knowledge. It is either 180 size (blade size) or maybe 200 size (Align size convention).
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