A pair of very high quality GM 14 x 9 F flat folding prop blades
, suitable for HyperFlight's and other makes of folding prop yokes and spinners. These blades have less twist than usual, allowing them to fold flatter against a glider fuselage, reducing drag.
These blades are thinner (they have a higher aspect ratio) than normal folding propeller blades, allowing larger diameter blades to be fitted without pulling too much current. This increases the propulsive efficiency of the powertrain. The reduced twist (flatness) also allows them to fold closer to the fuselage, and cause less drag when folded than other props. The flatness does reduce the efficiency slightly, but this is more than offset by the improved glide. See photos 3 and 4 for a visual comparison of GM, RF and Aeronaut props, kindly produced by Andre Jeber Demetrio.
Note this product consists of two carbon propeller blades only. The central spinner/yoke assembly is not included. Also it is common for prop blades to not fit all spinner/yokes perfectly as supplied. It is often necessary to reduce the width the blade root slightly to ensure free folding movement. Also the cut out in the spinner cone often needs to be increased to allow the blades to fully extend. The root of the blade should not touch the spinner cone when the prop is fully opened.
|GM Flat 14x9 Folding Propeller Blade Specifications|
|| 14 in
|| 9 in
|Weight of 2 blades
|Width of blade root
|Hinge pin hole dia