In a bubble test, air is blown in front of the spinning propeller to visualize the flow of the water. This revealed some stalling on the bi-blade and the toroidal design too, which would explain ...

Both modes have been used with the air propeller being favored for high speed record attempts in still water ... For human powered systems the efficiency must be as high as possible and the design of ...

The use of a bicycle power train in conjunction with a large air propeller also became the favored mode of power transfer in the record setting Decavitator hydrofoils. The photograph and diagram show ...

The system is powered by an air motor-mounted propeller fed by an onboard compressed ... More information: Abdul Hai Alami et al, Experimental design and testing of a pneumatic propulsion system ...

Researchers have developed an innovative propeller system to replace the electric and diesel engines currently powering ferries on fixed sea routes. The system is powered by an air motor-mounted ...