For over 50 years propeller nozzles (guards) have been successfully used worldwide on canal boats, river boats and commercial fishing vessels to achieve greater propeller thrust and better fuel savings. Now prop safety guards are available to the pleasure boater as well to reduce line entanglement and safety to humans and wildlife.
Marine Propeller Safety Guards available in 9.9 to 250hp. Durable plastic guard for protecting the propeller from simple objects; It also protects people from the propeller. To achieve optimal performance out of your motor, you may need to change your propeller diameter ½” smaller than inside diameter of propeller guard. The closer the prop blades are to the guard rings will optimize your performance and handling. Your motor will also have to be trimmed to a setting of optimal performance.