Title:
AEROFOIL SURFACE FOR CONTROLLING SPIN
Document Type and Number:
WIPO Patent Application WO2006100526
Kind Code:
A3
Abstract:
The invention concerns craft of the type in which a fan directs a jet of fluid (4) over a curved canopy (1). The canopy (1) is shaped to divert the flow from a radial to an axial direction to produce lift. A problem is that rotation of the fan causes unwanted rotation of the canopy (1). The problem is solved using vanes (6) on the canopy (1) that have an adjustable surface area; and by providing a control system to adjust the effective surface area so as to compensate for the tendency of the rotor to rotate the canopy. The vanes (6) can be designed to slide in and out of the canopy (1) to obtain the required adjustment. In a preferred arrangement the vanes are arranged between upstream and downstream ends of the flow at a position where the effects of changes in swirl angle with varying rotor speed at least partially compensate for consequential changes in the tendancy for the canopy to spin.
Inventors:
HATTON GEOFFREY (GB)
MCINTOSH SIMON (GB)
MCINTOSH SIMON (GB)
Application Number:
PCT/GB2006/050067
Publication Date:
November 23, 2006
Filing Date:
March 23, 2006
Export Citation:
Assignee:
GFS PROJECTS LTD (GB)
HATTON GEOFFREY (GB)
MCINTOSH SIMON (GB)
HATTON GEOFFREY (GB)
MCINTOSH SIMON (GB)
International Classes:
B64C39/06; B64C5/12; B64C5/18
Foreign References:
| US5203521A | 1993-04-20 | |||
| GB915515A | 1963-01-16 | |||
| US2997254A | 1961-08-22 | |||
| US6450446B1 | 2002-09-17 | |||
| US20040129831A1 | 2004-07-08 | |||
| DE29914928U1 | 2001-02-08 | |||
| GB942856A | 1963-11-27 |
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