The Rival 34 Sailboat
The Rival 34, a masthead sloop, was designed by Peter Brett and built in the UK by Southern Shipbuilding Ltd.
The Rival 34 was a further development of the Rival 32 with a slightly deeper afterbody and longer overhangs to give improved steadiness in a seaway.
Published Specification for the Rival 34
Underwater Profile: Fin keel with skeg-hung rudder
Hull Material: GRP (Fibreglass)
Length Overall: 34'0" (10.4m)
Waterline Length: 24'10" (7.6m)
Beam: 9'8" (3.0m)
Draft: 5'10" (1.8m) - Shoal draft version: 4'8" (1.4m)
Rig Type: Masthead sloop
Displacement: 11,900lb (5,398kg)
Designer: Peter Brett
Builder: Southern Shipbuilding (UK)
Year First Built: 1972
Number Built: 174
Owners Association: Rival Owners Association
Published Design Ratios for the Rival 34
1. Sail Area/Displacement Ratio: 13.9
- 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: 39.5
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 347
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 32.5
- 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: 1.7
- 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 34
1. A Sail Area/Displacement Ratio of just 13.9 suggests that the Rival 34 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.
2. A Ballast/Displacement Ratio of 39.5 means that the Rival 34 will initially stand up reasonably well to her canvas in a moderate breeze, but she'll need a reef in the main to avoid heeling excessively in a gust.
3. A Displacement/Length Ratio of 347, tells us the Rival 34 is clearly a heavy displacement cruising boat. You can load her down with all your cruising gear and equipment and it will hardly affect her waterline. Not an ideal choice for coastal sailing, but she'll come into her own on an offshore passage in testing conditions.
4. Ted Brewer's Comfort Ratio of 32.5 suggests that crew comfort of a Rival 34 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 1.7 tells us that a Rival 34 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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