contest 25 sailboat

• Yachting Monthly
• Digital edition

• July 9, 2009

The early Contests by U van Essen scarcely registered in this country. In the early 1970s, Dick Zaal designed a new range of cruiser-racers, which also included this Contest 25, a replacement for the company’s first yacht. She was imported in some numbers by Interyacht of Woodbridge. She is full-bodied with a shallow fin, skeg-hung rudder and moderate masthead rig. Former YM editor Des Sleightholme described her as ‘well-built and handsome… equally suitable as a family cruiser for beginners or for passage racing.’ She may not make the grade in racing anymore, but her five-berth layout with good headroom, practical galley and heads amidships, is comfortable and spacious, though simple in construction. She is light and stable on the helm and a good sea-boat.

LOA 7.54m (24ft 8in), LWL 6.10m (20ft), beam 2.5m (8ft 3in), draught 1.25m (4ft 1in), displacement 2,350kg (5,160lb). Price guide: £9,000 to £13,000. YM Test Report May 1973.

Contest 25 1

The contest 25 1 is a 25.0ft masthead sloop designed by g. luyten and built in fiberglass by contest yachts - conyplex between 1959 and 1969., 300 units have been built..

The Contest 25 1 is a moderate weight sailboat which is under powered. It is stable / stiff and has an excellent righting capability if capsized. It is best suited as a coastal cruiser. The fuel capacity is originally very small. There is a very short water supply range.

Contest 25 1 for sale elsewhere on the web:

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Contest 25 OC

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About the contest 25 oc  .

The Contest 25 OC is a recreational keelboat, built predominantly of fibreglass, with wood trim. It has a 7/8 fractional sloop rig with a deck-stepped mast with no spreaders, wire standing rigging and aluminum spars. The hull has a raked stem, a plumb transom, an internally mounted spade-type rudder controlled by a tiller and a fixed fin keel. It displaces 3,788 lb (1,718 kg) and carries 1,510 lb (685 kg) of cast iron ballast. The boat has a draft of 4.92 ft (1.50 m) with the standard keel. The boat is fitted with a Swedish Volvo Penta diesel engine of 7 hp (5 kW) for docking and manoeuvring. The fuel tank holds 20.4 U.S. gallons (77 L; 17.0 imp gal) and the fresh water tank has a capacity of 26 U.S. gallons (98 L; 22 imp gal). The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and two straight settees in the main cabin. The galley is located on the port side just aft of the bow cabin. The galley is equipped with a two-burner stove and a sink. The head is located just aft of the bow cabin on both sides. Cabin headroom is 64 in (160 cm). For sailing downwind the design may be equipped with a spinnaker of 420 sq ft (39 m2). The boat has a PHRF racing average handicap of 264 and a hull speed of 6.2 kn (11.5 km/h).

Netherlands

3,788 lb (1,718 kg)

4.92 ft (1.50 m)

Jacques De Ridder

24.61 ft (7.50 m)

20.51 ft (6.25 m)

9.02 ft (2.75 m)

Volvo Penta 7 hp (5 kW) diesel engine

1,510 lb (685 kg)

internally-mounted spade-type rudder

Rig / Sails

Bermuda rig

170 sq ft (16 m2)

136 sq ft (12.6 m2)

totalSailArea

iForetriangleHeight

jForetriangleBase

pMainsailLuff

eMainsailFoot

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• Sailboat Guide

Contest 25-1

Contest 25-1 is a 25 ′ 0 ″ / 7.6 m monohull sailboat designed by G. Luyten and built by Contest Yachts - Conyplex between 1959 and 1969.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

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Contest 25 - Conyplex / STW002040

cabin cruiser

Ruggerini 18 cv

overall length

hull length

waterline length

standard draft

minimum draft

displacement

diesel tank

mast height

Accomodation layouts

standard version

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