Thrust generating apparatus

Details Thrust generating apparatus Thrust generating apparatus

2006-03-23

2010-12-28

Ellis, Christopher P (Department: 3644)

Aeronautics and astronautics

Aircraft, heavier-than-air

Fluid sustained

C244S012200, C244S03400R

Reexamination Certificate

active

07857256

ABSTRACT:
There have been past proposals for air vehicles employing the Coanda effect. In these proposals, a jet of fluid, usually air, is made to flow radially outwardly over 5 a dome-shaped canopy to create lift. A cross-section through the canopy is curved to follow a segment of a circle or it may have a radius of curvature that increases in the direction of flow. In the invention, the radius (r) of the canopy curve decreases towards the downstream direction (x) in a way that is related to the decrease in the width of 10 the jet as it flows over the surface. This means that the radius of curvature decreases (instead of increasing) towards the downstream direction with the rate of decrease being progressively less rapid towards the downstream direction.

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