The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 1989
Filed:
Sep. 21, 1988
Staas Gietzen, Leonberg, DE;
Hans Weiner, Muhlacker, DE;
Klaus Hain, Leonberg, DE;
August Hofbauer, Pforzheim, DE;
Juergen Hawener, Moglingen, DE;
Dr. Ing. h.c.F. Porsche AG, Stuttgart, DE;
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.