Abstract: An improved propeller blade is presented. The improved blade has a slot near the tip. This improved blade outperforms and is more efficient than other modified and unmodified blade tip configurations.

Abstract: The invention is directed to an improved internal combustion engine, having a symmetric cylindrical arrangement and using a bevel gear train to join multiple crankshaft sections. It provides for a naturally smoother operation with less vibration than in-line engines. Better efficiency is expected with the engine than with comparable in-line engines. Manufacturing is expected to be simpler and gasket-sealing better than the in-line and V types of engines. Compactness will add to the engine's utility.

Abstract: Provided is an aerodynamic body having rhomboid wings and internal torsion bars which can be twisted to affect a change in the shape of a wing. Individual or multiple swings can slide relative to the fuselage body to affect a change in sweep angle and aspect ratio. Provided is a method of controlling the aerodynamic properties, in order to affect stability and maneuvering, of an aerodynamic body by warping the wings by twisting one or more torsion bars located internal to one or more wings. Additional control can be exercized by sliding one of more wings relative to the fuselage to change the sweep angle and aspect ratio.