The Rival Bowman 40 Sailboat

The Rival Bowman 40, an aft-cockpit cutter, was designed by Chuck Paine and built in the UK by Southern Boat Building Ltd.

A Rival Bowman 40 at anchorThe Rival Bowman 40 is the boat that many UK sailors hold as the ideal long-distance cruiser...

Published Specification for the Rival Bowman 40

Underwater Profile: Scheel keel and skeg-hung rudder

Hull Material: GRP (fiberglass)

Length Overall: 39'11" (2.2m)

Waterline Length: 32'0" (9.8m)

Beam: 12'7" (3.8m)

Draft: 4'11" (1.5m)

Rig Type: Cutter-rigged sloop

Displacement: 19,000lb (8,618kg)

Designer: Chuck Paine

Builder: Southern Boat Building Ltd (UK)

Year First Built: 1987

Owners Association: Rival Owners Association

Bowman website: Rival Bowman (UK)

Published Design Ratios for the Rival Bowman 40

1. Sail Area/Displacement Ratio: 16.8

  • Less than 16 would be considered under-powered;
  • 16 to 20 would indicate reasonably good performance;
  • Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: Not known

  • Under 40: less stiff, less powerful
  • Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 259

  • Under 100: Ultralight
  • 100 to 200: Light
  • 200 to 275: Moderate
  • 275 to 350: Heavy
  • Over 350: Ultraheavy

4. Comfort Ratio: 31.3

  • Under 20 indicates a lightweight racing boat
  • 20 to 30 indicates a coastal cruiser
  • 30 to 40 indicates a moderate offshore cruising boat
  • 40 to 50 indicates a heavy offshore boat
  • Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 1.9

  • Under 2.0 (the lower the better): Better suited for ocean passages
  • Over 2.0: Less suited for ocean passages

read more about these all-revealing numbers...

Summary Analysis of the Design Ratios for the Rival Bowman 40

1. A Sail Area/Displacement Ratio of 16.8 suggests that the Rival Bowman 40 will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.

2. The Ballast/Displacement Ratio is not known.

3. A Displacement/Length Ratio of 259, tells us the Rival Bowman 40 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 31.3 suggests that crew comfort of a Rival Bowman 40 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.9 tells us that a Rival Bowman 40 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.

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