Home / Equipment / Propellers / Hubs & Spinners

Hubs & Spinners

F5B props are designed for very high speeds and so often have a very high pitch which will prevent them from folding flat to the fuselage. This creates more drag on the glide which we definitely don’t want.If a prop hub is made with the blades offset from the centre line it will help the blades fold flatter against the side of a circular fuselage.

Another approach is to make the prop blades with a lower pitch than required so they will fold flatter, but use them on a special hub with extra “twist” at the blade mounting to get the right pitch when open. For example the RFM 17×18 props are only 17×18 when used with a hub that has a blade twist of +5 degrees.
Hubs with both twist and offset are quite common in F5B.The RFM site explains which of their blades need the special hubs.

About Alan Flockhart

Check Also

Removing Spinner

Hub Removal

Sometimes a prop hub will seem to get stuck on the motor shaft – this ...