Abstract: The engine includes at least two cylinders 2 laid out flat and opposed one to the other, a crankshaft 9 to transmit to the output shaft of the engine the energy provided by the explosions in cylinders 2. A rigid connecting rod assembly 18 connects crankshaft 9 to the pistons 17 mobiles in cylinders 2. Connecting rod assembly 18 is assembled directly on the crankshaft 9 which is cast solid, without sliding shoe. The bottom of each cylinder 2 ends in a trunked cone whose top determines, with an end of piston 17, an exhaust port which is closed before the lights of transfer, by starting a strong depression and a overfeeding of the engine.

Abstract: A device consisting of two piston pumps for supplying two separate liquid systems, particularly a fuel injection system and an oil system in an internal combustion engine.

Abstract: According to the invention, the valve comprises a cylindrical body (21) in a housing (21), for receiving one end of a return spring while the end is in contact with the case. The valve also includes two ribs (22, 23) for connection to a sealing plate (25) contacting the inner surface of an annular chamber (27) above an opening (26) thereof. The annular chamber is arranged to shorten the distance between the valve and the corresponding transfer port. The air valve of the invention is for spark ignition engines, in particular two-stroke engines.

Abstract: A propeller unit, each blade (1) being fixed to a blade foot (2) rendered integral with a hub (3) rotating around an axis but mobile with respect to the hub on translation in the direction of the axis and rotating around a second axis orthogonal to the first axis, this foot (2) being moreover rendered integral with an arch (5) in translation but free with respect to the arch on rotation; a pitch modifier is linked to the arch to translate the arch along the spin axis of the hub (3); the hub (3) and each blade foot (2) have members (8, 23) for activating the feet in rotation provoking from translation of the arch (5) the rotation of the blade feet around an axis mobile on translation in the same direction and orthogonal to the blade feet.

Abstract: The piston is composed of three independent elements including a lower element 3 which bears in a housing 4 a gasket segment 5, an intermediate element 2 secured to the lower element 3 so as to retain the segment 5, and a piston head 1 secured to the lower element 3. The imperviousness on the piston head 1 is ensured by a static segment 20 placed in a housing 19 of a segment holder 18 secured to the upper portion of the cylinder 17. The cooling and lubrication of the segment 20 are embodied by an oil circulation in the annular clearance 23 provided between the segment holder 18 and the segment 20.

Abstract: A film retaining and tensioning element is provided in which the film passes between a pair of facing channel members adapted to be embedded one within the other and having complementary sinuous profiles whereby the inner channel pivots on the outer during assembly and progressively pinches and stretches the film. As tension on the film increases the locking effect further increases.