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US20060201721 Rotary propeller  
Disclosed is a rotary propeller having a rotor 3 rotating in a duct 1 and a plurality of blades 5, 7 secured to the rotor. The blades comprise apertured blades 5A, 5B, 5C and non-apertured blades...
US20060207808 Counterintuitive Physics Demonstration Mechanism  
A vehicle designed to harness the kinetic energy of a stream of gas or liquid aimed in a constant direction toward its front end, with the surprising and educational result that it moves into the...
Matches 1 - 2 out of 2