Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Ketch
LOA: 42.00 ft / 12.80 m
LWL: 30.33 ft / 9.24 m
S.A. (reported): 640.00 ft² / 59.46 m²
Beam: 12.25 ft / 3.73 m
Displacement: 16,500.00 lb / 7,484 kg
Ballast: 7,163.00 lb / 3,249 kg
Max Draft: 6.00 ft / 1.83 m
Construction: FG
First Built: 1978
Builder: Tyler Boat Works (UK)
Designer: Robin Chadworth-Musters/Alan Gurney

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Fuel: 114 gals / 432 L


Water: 115 gals / 435 L

Sailboat Calculations

S.A. / Displ.: 15.86
Bal. / Displ.: 43.41
Disp: / Len: 264.01
Comfort Ratio: 26.79
Capsize Screening Formula: 1.93
Hull Speed: 7.38 kn
Pounds/Inch Immersion: 1,327.56 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Sailboat Links

Designers: Alan Gurney
Builders: Tyler Boat Co. Ltd. (UK)
Download Boat Record:


This from Robin Musters: (courtesy of 'sailorman_john')
"The Slipper 42 started life as the RANCHER 41, for which Tyler Boat Works acquired the molds.
We raised the topsides about a foot and discarded the bolt on keel and spade rudder in favour of internal ballast and a skeg rudder. This converted a racing hull into a cruising boat. As well as the keel and rudder, I drew the interior layout and the new deck."