# US 9,751,594 B2 · High stability low drag boat hull

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- Number: US 9,751,594 B2
- Document ID: US9751594B2
- Status: Granted
- Kind: B2
- Application number: 15/071,007
- Filed: 2016-03-15
- Published: 2016-07-07
- Granted: 2017-09-05
- Earliest claimed: 2013-05-16
- Applicants: Chris Rickborn
- Inventors: Chris Rickborn
- Web page: https://patentgrep.com/patent/US9751594B2

## CPC

- B63B 3/38: Keels (movable keels B63B41/00)
- B63B 1/042: {the underpart of which being partly provided with channels or the like, e.g. catamaran shaped}
- B63B 1/20: having more than one planing surface (B63B1/22 takes precedence)
- B63B 5/24: made predominantly of plastics {(surf boards B63B32/57)}
- B63B 2001/201: {divided by longitudinal chines}
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)

## Abstract

A modified V-hull boat has a keel starting at about 20% from the bow ending 75 to 80% aft of the bow and has an inverted airfoil shape. A flat pad blends in aft of the keel assisting planning and attitude at speed. A bracket having a bottom shape and size to float a designated amount of weight and a downward angle facing down at the aft on the bottom to act as a positive planning fixed trim tape that ride's above the water at speed or on plane, and adds stability and positive buoyancy for weight of engines at rest or low speed. Chine's are the outside corner of the boat joining the bottom to the side's. The chine's taper slightly inboard aft to relieve friction and drag. Although they do not come together the chine is no way a straight line the outer edges are slightly more ellipsoidal hence the name.

## Claims

### Claim 1

A keel along the centerline of a V-hull boat comprising:
two symmetric sides and a curved bottom edge;
a front end beginning at a point between 15% and 30% down the length of the hull;
a leading edge having a length extending from the front end to a widest point of the keel,
a trailing edge having a length extending from the widest point of the keel to an end point of the keel;
wherein the widest point of the keel is vertically aligned with the center of gravity of the V-hull; and,
wherein the length of the leading edge is greater than the length of the trailing edge.

### Claim 2 (depends on 1)

The keel of claim 1 wherein the V-hull further comprises a flat keel pad beginning at the end point of the keel.

### Claim 3 (depends on 2)

The keel of claim 2 wherein along the centerline, the leading edge of the keel is convex and the trailing edge of the keel is concave.

### Claim 4 (depends on 3)

The keel of claim 3 wherein, along a horizontal cross section, the leading edge of the keel is convex and the trailing edge is concave.

### Claim 5 (depends on 4)

The keel of claim 4 wherein the length of the leading edge is more than twice the length of trailing edge.

### Claim 6 (depends on 5)

The keel of claim 5 wherein the front end is pointed.

### Claim 7 (depends on 6)

The keel of claim 6 wherein the length of the leading edge is five times the length of trailing edge.

### Claim 8 (depends on 7)

The keel of claim 7 wherein the front end begins at a point between 20% and 25% down the length of the hull and the widest point of the keel is between 65% and 75% down the length of the hull.

### Claim 9 (depends on 3)

The keel of claim 3 wherein, along a horizontal cross section, the leading edge of the keel is convex and the trailing edge is straight.

### Claim 10 (depends on 9)

The keel of claim 9 wherein the length of the leading edge is more than twice the length of trailing edge.

### Claim 11 (depends on 10)

The keel of claim 10 wherein the front end is pointed.

### Claim 12 (depends on 11)

The keel of claim 11 wherein the length of the leading edge is five times the length of trailing edge.

### Claim 13 (depends on 12)

The keel of claim 12 wherein the front end begins at a point between 20% and 25% down the length of the hull and the widest point of the keel is between 65% and 75% down the length of the hull.