38mm GM F5J Spinner (No Collet)

The GM F5J Carbon 38mm Spinner Assembly for 8 mm root folding propeller blades is suitable for all electric gliders requiring a 38 mm diameter spinner. The spinner assembly consists of a very nicely molded carbon fibre spinner cone, a 7075 alloy CNC yoke (centre piece), two polished steel hinge pins for mounting the prop blades and a hex end conical spinner retailing screw. The end of the hinge pins are threaded for securing them into the yoke. The spinner and prop assembly attach to the motor shaft using a conical split collet (purchased separately) which is clamped to the shaft by tightening the front clamping screw.

The GM F5J Carbon 38mm Spinner Assembly does not include the collet to attach the assembly to the motor or gearbox output shaft. This must be purchased separately, according to the diameter of the output shaft.

Benefits of the GM F5J Carbon 38mm Spinner Assembly include:

• The accurately CNC machined 7075 aluminium yoke is generously proportioned, for maximum safety and power handling.
• The straight yoke design reduces the force on the root of the prop blades, and is safer for high power/high RPM setups.
• Supplied with a beautiful moulded carbon spinner cone.
• Split collet mounting reduced vibration and avoids the need for flats on the motor shaft.
• By switching collets it can be used on most powertrains.

See the last two photos to see how well the spinner works, especially when fitted with GM pro blades, and how closely the blades fold to the fuselage on this Infinity F5J model. Also please read this great customer review to see how well people like these spinners in real life.

To fit the folding propeller blades unscrew the retaining/clamping bolt completely with a 3mm Allen key (not included). Remove the nosecone, easing it over the yoke, then unscrew the threaded hinge pins, and fit prop blades. If they don’t hinge freely it is okay to remove a small amount of material from the blade root. Finally reassemble the spinner and secure the head of the bolt with Loctite Threadlocker Blue 242.

To fit the prop/spinner assembly to the gearbox output shaft (or to the motor shaft in direct drive installations) unscrew the retaining/clamping bolt a few turns with a 3mm Allen key (not included). This will loosen the collet and allow it to slide over the shaft. Then tighten the retaining/clamping bolt until the prop assembly is firmly attached. Up to 4.5 Nm of torque can be safely used when tightening the Allen key.

GM F5J 38mm/38mm Spinner Assembly Specification
Diameter	38 mm
Distance across hinge pins	38 mm
Prop hinge pin diameter	3 mm
Prop blade root width	8 mm
Weight	16 g