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Sirius 727
Designer: H. Streuer  ·  Builder: Grell Werft (Germany)
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About the Sirius 727

German builder Grell Werft partnered with designer H. Streuer to create this compact 24-footer that punches above its weight in both performance and seaworthiness. The Sirius 727's fractional sloop rig and moderate displacement of 3,131 pounds deliver a sail area-to-displacement ratio of 18.8, indicating spirited performance that will satisfy sailors seeking responsive handling without sacrificing stability. With a comfort ratio of 13.26, this fiberglass cruiser strikes an excellent balance between motion comfort and sailing ability, making it well-suited for coastal cruising and weekend adventures. The fin keel with rudder on skeg configuration provides reliable directional control while maintaining good upwind performance. At 4.10 feet of draft, the boat can access shallow anchorages while the substantial ballast ratio ensures confident stability in challenging conditions. The capsize screening formula of 2.24 falls within acceptable limits for offshore sailing, though the 727 truly excels in coastal and inland waters where its 6.20-knot hull speed and nimble handling shine. German construction standards from Grell Werft contribute to the boat's reputation for solid build quality, while the fractional rig offers excellent sail shape control and manageable sail handling for shorthanded crews.

Core Dimensions
LOA (Length Overall) 23.85 ft / 7.27 m
LWL (Waterline Length) 21.39 ft / 6.52 m
Beam 8.20 ft / 2.50 m
Max Draft 4.10 ft / 1.25 m
Displacement 3,131.00 lb / 1,420 kg
Ballast 1,345.00 lb / 610 kg
Sail Area (Reported) 250.80 ft² / 23.30 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Fractional Sloop
Construction FG
Designer H. Streuer
Builder Grell Werft (GERMANY)
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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
 18.8
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
 42.96
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
 142.82
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
 13.26
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
 2.24
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. 6.20 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 3.58
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. 626.72 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 17.68
Rig Dimensions
I (Foretriangle Height) 26.25 ft / 8.00 m
J (Foretriangle Base) 8.86 ft / 2.70 m
P (Mainsail Luff) 25.59 ft / 7.80 m
E (Mainsail Foot) 9.35 ft / 2.85 m
SA Fore 116.29 ft² / 10.80 m²
SA Main 119.63 ft² / 11.11 m²
SA Total (100%) 235.92 ft² / 21.92 m²
Est. Forestay Length 27.70 ft / 8.44 m
Engine & Accommodations
Water Capacity 16 gals / 60 L
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