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Bunyip 20
Designer: Lock Crowther  ·  Builder: Plans For Home Builder  ·  First built: 1962
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About the Bunyip 20

Named after the legendary Australian water creature, this compact sailboat represents an intriguing entry in the small boat market, though detailed information about its specifications and design history remains elusive. The Bunyip 20 appears to be positioned as a versatile coastal cruiser, suitable for weekend adventures and day sailing in protected waters. With limited technical data available, prospective buyers should approach this model with careful research and thorough inspection. The boat's 20-foot length suggests it's designed for intimate sailing experiences, likely accommodating a small crew or couple seeking an affordable entry into sailing. Given its size constraints, the Bunyip 20 would be best suited for coastal exploration rather than extended offshore passages. The scarcity of readily available specifications may indicate either limited production numbers or a regional design that hasn't gained widespread international recognition. Potential owners should focus on evaluating the boat's construction quality, hull condition, and sailing characteristics through hands-on inspection and sea trials. For those considering this model, connecting with existing owners or local sailing communities familiar with the design would provide valuable insights into its real-world performance and reliability.

Core Dimensions
LOA (Length Overall) 20.00 ft / 6.10 m
LWL (Waterline Length) 18.60 ft / 5.67 m
Beam 11.00 ft / 3.35 m
Max Draft 3.00 ft / 0.91 m
Displacement 700.00 lb / 318 kg
Design & Construction
Hull Type Trimaran Dbrd.
Rigging Type Masthead Sloop
Construction Plywood
Designer Lock Crowther
Builder Plans for home builder
First Built 1962
Owner Reviews

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Performance Ratios
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
48.56
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
2.32
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
4.96
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. 5.78 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. 4.38 pounds/inch
Rig Dimensions
I (Foretriangle Height) 0.80 ft / 0.24 m
P (Mainsail Luff) 227.00 ft² / 21.09 m²
E (Mainsail Foot) 48.56
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