The prop shaft needs two bearings to carry radial and moment loads. The rubber joint will not do it for long. A four cylinder four stroke DD Diesel is very tough on props. Stick with wood with a beefier than normal hub and blade shanks.Great Forum! I've learned a great deal from reading through this thread. I too want to be able to use a production automotive engine with these capabilities. I'm a proponent of keeping things as stock as possible and had run across the LH7 turbo diesel and after looking at the hp/torque/rpm chart wondered if this could be used driving a prop directly off of the flange end of the crank through a BMW drive shaft vibration damper. The prop hub would require its own bearing, of course. I'm new to this means of communicating so wondered if we could start a thread specifically for that engine to avoid cluttering this discussion?