The RM-1050 Sailboat
Specs & Key Performance Indicators
The RM-1050, a plywood-hulled cutter, was designed by Marc Lombard and built in France by RM-Fora Marine.
Published Specification for the RM-1050
Underwater Profile: Twin keel & spade rudder*
Hull Material: Multi-chine plywood
Length Overall: 34'4" (10.5m)
Waterline Length: 32'2" (9.8m)
Beam: 13'0" (4.0m)
Draft: 5'3" (1.6m)
Rig Type: Cutter
Displacement: 10,362lb (4,700kg)
Designer: Marc Lombard
Builder: RM-Fora Marine (France)
Year First Built: 1998
Year Last Built: 2011
* An alternative version was produced with a single fin keel and twin rudders
Published Design Ratios for the RM-1050
1. Sail Area/Displacement Ratio: 23.0
- 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: 38.3
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 139
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 16.1
- 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: 2.4
- Under 2.0 (the lower the better): Better suited for ocean passages
- Over 2.0: Less suited for ocean passages
Read more about these Key Performance Indicators...
Summary Analysis of the Design Ratios for the RM-1050
1. A Sail Area/Displacement Ratio of 23.0 suggests that, in the right hands, the RM-1050 will have enough performance to leave most other sailboats of similar waterline length well astern.
2. A Ballast/Displacement Ratio of 38.3 would usually mean that the RM-1050 would have a tendency to heel uncomfortably in a gust, and need to be reefed early to keep her sailing upright in a moderate breeze.
However, as she has much of her ballast concentrated in the bulbs at the foot of her keels, she's likely to be considerably stiffer than her published Ballast/Displacement Ratio might suggest.
3. A Displacement/Length Ratio of 139, tells us the RM-1050 is clearly a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer to a degree.
4. Ted Brewer's Comfort Ratio of 16.1 suggests that the RM-1050 will have the motion underway to that of a lightweight racing boat. Crew comfort will often be memorable for all the wrong reasons. Upwind in lively conditions the RM-1050 will slam enough to shake your fillings out with a motion that most cruising sailors have no desire to get used to.
5. The Capsize Screening Formula of 2.4 tells us that a RM-1050 would not be as good a choice of sailboat for ocean passage-making, owing to the increased risk of capsize in strong winds and heavy seas when compared to a sailboat with a CSF of less than 2.0.
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