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:
Sep. 21, 1999
Filed:
Nov. 29, 1997
Ronald A Smith, Ventura, CA (US);
Other;
Abstract
A twin engine, coaxial, dual-propeller propulsion system employing a unique transmission having two independent drive trains. The first of the two engines exclusively drives a first drive train, which in turn rotates a forward multi-bladed propeller assembly. The second engine exclusively drives a second drive train, which in turn rotates an aft multi-bladed propeller assembly. Thus, the propellers of this propulsion system, even though coaxial, are driven by separate engines. The propulsion system also enjoys the increased propulsive efficiency of a coaxial dual-propeller design as the first drive train rotates the forward propeller assembly in a first rotational direction and the second drive train rotates the aft propeller assembly in the opposite direction. Further, the propulsion system employs pitch change control mechanisms which independently control the respective pitch of the blades of the two propeller assemblies. Specifically, a first pitch change controller exclusively controls the pitch of the blades of the forward propeller assembly and a second pitch change controller exclusively controls the pitch of the blades of the aft propeller assembly.