Abstract: A helicopter rotor system in which a plurality of rotor blades are attached to the rotor mast. Each blade has a spar formed of fibers bundled and bonded together inside a skin. These fibers are divided into two bundles, each of which has a bight with a bend and two arms that double back into the spar. The bights are joined to the mast by spaced-apart attachments. The attachments may be plate-like, and can be shaped to provide initial coning and camber angles.

Abstract: A barrel-type internal combustion engine having a plurality of parallel two stroke piston-cylinder assemblies grouped around a central axis and output shaft. The induction system is from a charge-forming means into intake ports on the outside of the cylinder array, without passage through the crank case. The exhaust ports face inwardly into a central exhaust gas collector. A rotary exhaust valve control the exhaust. Coolant is circulated from a central pump. The induction system can be pressurized by a supercharger or a turbocharger. A swash plate converts axial piston movement to rotary movement of the output shaft.

Abstract: A helicopter rotor system with a plurality of identical rotor blades each of which includes a skin that forms an interior region, a counterweight rod and a bundle of longitudinally-extending fibers in the region. The bundle continues outside of the region, and there it includes a bight portion with a pair of arms and a bend. The fibers in the region are continuations of the fibers in the bight portion. A torque tube is attached to the counterweight rod, and a bearing stabilizes the torque tube relative to the mast, but does not transfer any appreciable centrifugal load. This bearing permits rotation (feathering) of the torque tube around its own axis, and lateral movement in any direction from the torque tube axis, around the center of this bearing (lead lag, and flapping). The bight portion is progressively shaped from a single flat portion bent directly around the mast, through a pair of separate channel sections to a bundle adjacent to the counterbalance rod.

Abstract: A cast composite cylinder head assembly for an internal combustion engine having a cylinder liner cast integrally with a cylinder head, and a process for making the same wherein, as the consequence of a casting process, open continuous passages can be formed inside the cylinder head itself, in a bore in the liner, and in ports through the liner.

Abstract: A rotary drive powered by a piston engine provided with a ring-shaped engine mount which is also a fuel container and can be used as a handle, as a guard, and as part of a "stand" for the drive. Optionally, the rotary drive can be provided with handles, one of which carries a throttle control.