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:
Aug. 19, 2003
Filed:
Feb. 07, 2002
Clyde Warsop, Gloucestershire, GB;
Mike Woods, Bath, GB;
James Henderson, Gloucestershire, GB;
Gary Lock, Bath, GB;
BAE Systems plc, Hampshire, GB;
Abstract
A ring-wing aircraft suited particularly, although not exclusively, to use in micro-unmanned air vehicles (UAV's) with ring-wings. An aircraft ( ) according to the invention comprises a ring-wing ( ) defining a duct ( ) with a longitudinally-extending central axis ( ), propulsion element ( ) located within the duct and moveable aerofoils ( ) for controlling the aircraft in flight, the ring-wing being truncated obliquely at one end, that end being the rear ( ) when in horizontal flight, to form a ring-wing with opposed sides of unequal length. This arrangement produces center of mass offset from the central axis of the ring-wing, the pendulum effect will ensure that the aircraft will roll so that its center of mass will always be at the lowest height possible when the aircraft is airborne. Therefore the aircraft has a preferred orientation, and the control surfaces can be oriented with respect to this preferred orientation. In addition, the oblique truncation at the rear keeps the center of mass towards the front of the aircraft thereby giving improved stability in all three axes.