Graupner,Hydro-Antrieb III,3341

Hydro-Antrieb III Graupner 3341 Completely assembled. The HYDRO III drive is mainly suitable for driving and steering catamarans and hydro racing boats. Thanks to the adjustable shaft shank the height of the propeller relative to the surface of the water can be optimized. The hingedly mounted rudder can swing backwards when passing over obstacles in the water. A pressure spring returns the rudder to its initial position after clearing the obstacle. Designed for electric motors and com-bustion engines having an output of up to 1 kW. Dimensions (nom.) Length 110 mm, height 110 mm

This novel propulsion system is used to drive and steer boats of the hydroplane type. Thrust is provided by a HYDRO surface-propeller which operates semi-submerged in the water, when the boat is planing. Semi-submerged propellers are mainly used on fast racers. In the case of model boating they are tethered-running NAVIGA A class racers, HYDRO racing boats and catamarans. The blades of the semi-submerged propeller, immersed at one time of a revolution, above the water in the next one, throw up a most impressive plume of spray water behind the boat, sure sign of optimum propeller efficiency.