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US 4,296,704 AGranted
Anti-gravity spinnaker
OwnerJohn G. Bridgeinventor
Life of this patent
Estimating the term…
Abstract
This invention relates to an improved spinnaker which is lighter-than-air and designed to float ahead of the boat and to retain its shape when subject to wind variations.
Claims8
A spinnaker large enough to aid a sailboat when sailing with the wind behind the boat, comprising:
- a piece of flexible sail fabric having a top end, a bottom end and at least two sides, an interior surface and an exterior surface;
- a plurality of tubular shaped inflatable bags of variable widths attached to the exterior surface of the fabric and containing a lighter-than-air gas;
- stabilizing lines extending from the corners of the interior surface of the fabric said lines joined above the surface of the fabric at about the mid-point of the interior surface;
- and
- means at three pointss on the spinnaker for attaching riggings from the spinnaker to both sides of the hull of the boat and to the top of the mast.
2 more elements
Dependencies are inferred from the claim text.