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Rm 900
Designer: Bruno Devriese  ·  Builder: Sysba Marine (Fra)  ·  First built: 1989
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About the Rm 900

Designed by Bruno Devriese and built by French manufacturer Sysba Marine starting in 1989, this 30-foot sailboat represents a thoughtful approach to coastal cruising with shallow-water capability. The twin keel configuration sets the Rm 900 apart from conventional monohulls, allowing it to sit upright when beached or in drying harbors while maintaining reasonable sailing performance with its fractional sloop rig. With plywood and marine epoxy construction, the Rm 900 offers a robust yet relatively lightweight platform at 7,275 pounds displacement. The twin keels provide excellent directional stability and reduce draft to just over four feet, making this boat ideal for exploring shallow bays, rivers, and tidal waters where deeper-keeled vessels cannot venture. The moderate sail area of 608 square feet delivers respectable performance while remaining manageable for small crews. The comfort ratio of 15.14 suggests a boat optimized more for cruising than racing, while the capsize screening formula of 2.4 indicates good stability for coastal waters. With only 43 hulls produced, the Rm 900 remains a rare find that appeals to sailors seeking the unique advantages of twin keel design for gunkholing and shallow-water exploration along protected coastlines.

Core Dimensions
LOA (Length Overall) 30.58 ft / 9.32 m
LWL (Waterline Length) 27.40 ft / 8.35 m
Beam 11.61 ft / 3.54 m
Max Draft 4.27 ft / 1.30 m
Displacement 7,275.25 lb / 3,300 kg
Ballast 2,866.01 lb / 1,300 kg
Ballast Type Cast iron
Sail Area (Reported) 608.16 ft² / 56.50 m²
Headroom 5.97 ft / 1.82 m
Design & Construction
Hull Type Twin Keel
Rigging Type Fractional Sloop
Construction Plywood/marine epoxy
Designer Bruno Devriese
Builder Sysba Marine (FRA)
First Built 1989
Number Built 43
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
26
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
39.39
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
157.89
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
15.14
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2.4
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 7.01 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 1,136.66 pounds/inch
Rig Dimensions
Mast Height (DWL) 41.34 ft / 12.60 m
Engine & Accommodations
Engine Type Diesel; Saildrive
Horsepower 20
Fuel Capacity 13 gals / 50 L
Water Capacity 106 gals / 400 L
LOD 30.31 ft / 9.24 m
How It Compares

vs. Dominant 95, First 30 E Beneteau Berret, Neptune Cruiser, Suspens Archambault, Yankee One Design

This boat Similar boats
Dimensions
LOA
Rm 900 ★
30.6 ft
Dominant 95
31.2 ft
First 30 E Beneteau Berret
30.5 ft
Neptune Cruiser
29.5 ft
Suspens Archambault
30.4 ft
Yankee One Design
30.5 ft
LWL
Rm 900 ★
27.4 ft
Dominant 95
26.3 ft
First 30 E Beneteau Berret
27.0 ft
Neptune Cruiser
19.2 ft
Suspens Archambault
25.6 ft
Yankee One Design
24.0 ft
Beam
Rm 900 ★
11.6 ft
Dominant 95
9.2 ft
First 30 E Beneteau Berret
10.7 ft
Neptune Cruiser
6.3 ft
Suspens Archambault
9.8 ft
Yankee One Design
6.5 ft
Displacement
Rm 900 ★
7 lbs
Dominant 95
6 lbs
First 30 E Beneteau Berret
7 lbs
Neptune Cruiser
2 lbs
Suspens Archambault
6 lbs
Yankee One Design
4 lbs
Ballast
Rm 900 ★
2 lbs
Dominant 95
2 lbs
First 30 E Beneteau Berret
2 lbs
Neptune Cruiser
1 lbs
Suspens Archambault
1 lbs
Yankee One Design
2 lbs
Sail Area
Rm 900 ★
608 sq ft
Dominant 95
First 30 E Beneteau Berret
Neptune Cruiser
Suspens Archambault
450 sq ft
Yankee One Design
Performance
SA / Displacement (higher = more powerful)
Rm 900 ★
26.0
Dominant 95
First 30 E Beneteau Berret
Neptune Cruiser
Suspens Archambault
21.6
Yankee One Design
Ballast / Disp (higher = stiffer)
Rm 900 ★
39.4 %
Dominant 95
44.8 %
First 30 E Beneteau Berret
40.6 %
Neptune Cruiser
47.0 %
Suspens Archambault
29.9 %
Yankee One Design
53.4 %
Comfort Ratio (higher = more comfortable offshore)
Rm 900 ★
15.1
Dominant 95
First 30 E Beneteau Berret
Neptune Cruiser
15.1
Suspens Archambault
16.7
Yankee One Design
Capsize Screening (lower = safer)
Rm 900 ★
2.40
Dominant 95
First 30 E Beneteau Berret
Neptune Cruiser
1.85
Suspens Archambault
2.16
Yankee One Design
Displacement / Length (lower = lighter)
Rm 900 ★
157
Dominant 95
157
First 30 E Beneteau Berret
160
Neptune Cruiser
160
Suspens Archambault
162
Yankee One Design
154
Hull Speed
Rm 900 ★
7.0 kts
Dominant 95
First 30 E Beneteau Berret
Neptune Cruiser
5.9 kts
Suspens Archambault
6.8 kts
Yankee One Design
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