The Trapper 501 Sailboat
The Trapper 501, a masthead sloop, was designed by Rob Ball and built in the UK by Trapper Yachts Ltd.
A Trapper 501 sailing in the River Tamar, Devon, UK
Both the Trapper 500 and the 501 were based on the C&C 37. The 501 differed from the 500 by a different coach roof and interior mouldings
Published Specification for the Trapper 501
Underwater Configuration: Fin with spade rudder
Hull Material: GRP (fibreglass)
Length Overall: 27' 4" / 8.33m
Waterline Length: 22' 2" / 6.76m
Beam: 9' 2" / 2.80m
Draft: 4' 3" / 1.30m
Rig Type: Masthead Sloop
Displacement: 5,180lb / 2,350kg
Designer: Rob Ball (Camper & Nicholson)
Builder: Trapper Yachts Ltd (UK)
Year First Built: 1977
Year Last Built: 1987
Number Built: 600
Owners Association: Trapper Owners Association
Published Design Ratios for the Trapper 501
1. Sail Area/Displacement Ratio: 18.4
- 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: 48.5
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 212
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 17.6
- 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: 2.1
- 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 Published Design Ratios for the Trapper 501
A Sail Area/Displacement Ratio of 18.4 suggests that she'll approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.
A Ballast/Displacement Ratio of 48.5 means that she'll stand up well to her canvas in a blow, enabling her to power through the waves.
A Displacement/Length Ratio of 212, tells us she's 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.
Ted Brewer's Comfort Ratio of 17.6 suggests that crew comfort in a seaway is similar to what you would associate with the motion of a lightweight racing boat. Upwind she'll slam enough to shake your fillings out with a motion that cruising sailors have no desire to get used to.
Her Capsize Screening Formula of 2.1 tells us that she would not be a good choice of sailboat for ocean passage-making.
Sailboats in the Trapper range include:
- Trapper 28
- Trapper 300
- Trapper 400
- Trapper 42
- Trapper 500/501
- Trapper 950
- Trapper T250
- Trapper T250s
- Trapper TS240
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