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:
Apr. 17, 2018
Filed:
Sep. 16, 2015
Bradford C. Stahl, Jackson, CA (US);
Bradford C. Stahl, Jackson, CA (US);
Other;
Abstract
An efficient reverse-thrusting modular propeller combines a center hub and a set of identical and replaceable blades. Each such blade has a radially and laterally symmetrical hydrofoil cross-section but disposed along a full wave (360°) sinusoidal mean camber line. The blades all feature a very strong thicker symmetric hydrofoil cross-section at the propeller root which widens with a longer sinusoidal mean camber line wavelength, and thins in amplitude moving outward, and then the blades narrow again in shorter wavelength and thin more in diminishing amplitudes progressing toward the distal tip. Localized cupping on the leading or trailing edges is ruled-out as undesirable and counterproductive.