What does a neoprene hub do upon impact?

A neoprene hub is designed to serve as a protective component in the propeller system of an outboard motor. Upon impact, such as when hitting an underwater object, the neoprene hub is engineered to break or "shear" at a predetermined torque. This action is crucial as it prevents damage to the more expensive and sensitive components of the outboard motor, particularly the drive shaft and engine itself.

By sacrificing itself in the event of an impact, the neoprene hub essentially acts as a safety feature, allowing the propeller to disengage in a controlled manner. This ensures that the motor can withstand sudden shocks without incurring significant damage that could result in costly repairs or potential engine failure.