Abstract: An arrangement is provided for providing a vacuum for the brake power assist unit of a motor vehicle having a vacuum pump which can be connected as required as a function of the operating conditions, and at least one other additional pump being provided for the buildup of a sufficient vacuum in the brake power assist unit. The additional pump is a secondary air pump already present in the vehicle, the controlling of the vacuum pump taking place simultaneously with the switching-on of the secondary air pump.

Abstract: A helicopter equipped with a reciprocating piston internal combustion engine in which an override clutch is arranged in a drive connection between the internal combustion engine and a rotor drive, is equipped with separate first and second electric motor starter devices (screw-push starters). A starter operation takes place in two phases whereby in a first phase initially the rotor drive is brought to a rotor synchronous rotational speed syn by means of the first starter device and in a second phase the internal combustion engine is started by means of the second starter device. When the internal combustion engine exceeds the idling rotational speed nl, the override clutch establishes the power-flow connection between the internal combustion engine and the rotor drive. Both phases can be carried out manually as also by a partly automatic or fully automatic control system on the basis of key depression.

Abstract: A drive arrangement for an aircraft with a propeller, especially a thrust propeller arranged in the rear fuselage of an aircraft frame which is connected with a drive unit. The drive unit is connected with a longitudinally installed tubular support member supportingly receiving a central shaft. The tubular support member as well as the drive unit are supported on the side of the fuselage by way of at least three elastic bearing supports. One bearing support is provided at the aircraft rear end of the tubular support member and the two other bearing supports are provided within the area of the drive unit.

Abstract: An adjusting device is provided for an airplane propulsion system using the reciprocating piston combustion engine and a propeller, which adjusting device simultaneously adjusts the throttle valve and the propeller pitch of the propellers. The adjusting device is formed with a connecting rod and a carrier rod connected thereto. The connecting rod is provided as an adjusting cable whereby the cable core is under spring pretensioning in lower rotational speeds of the motor.