The Boehm Freewheel Clutch was invented by Chris Boehm and is a positive free-weeler (it will automatically re-engage). It mounts on the prop shaft BEHIND the prop and the bail pushes on the side of the prop (as shown). The METAL version is machined from aluminum and weighs about 1/2 gram - fairly light. It is suitable for Peanuts and Dimers. You MUST grind or file a notch on the prop shaft to capture the set screw. The set screw (2-56) and allen wrench is tiny (0.035") and cannot withstand a lot of torque, so the notch is important. The bail works best on plastic props with a thin hub area. Wider props, like wood props will interfere with the bail operation. You will need to re-bend the bail wire to free-wheel wider props. If needed, you can replace the bail with 0.032" or 0.025" wire to suit your needs. Each clutch includes a properly sized allen wrench! AND now with retainers!
