Abstract: Disclosed is a two-stroke engine, especially for landcraft, watercraft, or aircraft models, comprising a piston which can be moved up and down within a bush, defines a combination chamber at the top, and is connected to a crankshaft via a con-rod at the bottom, said crankshaft being rotatably mounted in a crank housing located below the bush. In order to reduce friction of the piston in the bush of such a two-stroke engine, the bottom end of the bush, which adjoins the crank housing is provided with means that increase the temperature-related radial expansion of the bush.

Abstract: A two-stroke engine has a piston, mounted to be displaced in a cylinder, connected by means of a connecting rod to a crankshaft mounted to rotate about an axis in a crankcase that defines a crankcase chamber. The crankshaft includes a crankshaft duct that opens into the crankcase chamber which is, depending on the angle of rotation of the crankshaft, connected by way of an inlet opening in the crankshaft to an inlet manifold for an air/fuel mixture. The cylinder includes a transfer port, by way of which, the air/fuel mixture flows from the crankcase chamber past the piston into the working chamber based on the position of the piston in the cylinder. An increase in engine power is achieved by a gas mixing duct, a slot or a deflecting element arranged within the crankcase which improve(s) the filling of the crankcase chamber with the air/fuel mixture.

Abstract: Disclosed is a two-stroke engine, especially for landcraft, watercraft, or aircraft models, comprising a piston which can be moved up and down within a bush, defines a combination chamber at the top, and is connected to a crankshaft via a con-rod at the bottom, said crankshaft being rotatably mounted in a crank housing located below the bush. In order to reduce friction of the piston in the bush of such a two-stroke engine, the bottom end of the bush, which adjoins the crank housing is provided with means that increase the temperature-related radial expansion of the bush.

Abstract: A DC motor includes a rotor which is mounted in a housing so that it can rotate about an axis. The rotor includes at least one winding to which direct current is applied from the outside in alternating directions via a commutator, which is arranged on the rotor. Brushes are seated on the commutator and are mounted whereupon they can move relative to the commutator while being pushed by spring pressure onto the commutator.