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REDUCED PRICE. 1973 Fiberglass Vanguard International 470. 16’ Long. Hull No.185. Comes with sail-spinnakers and 1975 Royal Carrier Trailer. All For $1,000. Boat and trailer will need to be repaired. Selling As Is & Where Is. No warranty of any kinds. Must include your local phone number with all inquires. Principal Only. Will show it in any day of the week. Please No Scams/Marketing/Services inquires of any kinds. Thanks
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
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
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
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
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
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 Beam1.33)
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)
Spinnaker (typical size) 32 sq. m.
Dimensions are only based on class limits.
The International 14 is a high performance 2-Man, development racing dinghy with a long history of performance developments that often been adopted in the design of later boats.
For example it became one the earliest trapeze dinghys in 1938. Twin trapezes were adopted in 1984 to increase the sail carrying power and ease the handling of the large asymmetric spinnakers.
In 1996, the international version merged with the ‘Aussie’ version(orginally with slightly diferent rules). Today, with hiking racks, a giant flat head main, and it’s ‘skiff’ like hull, an up-to-date racing model bears little resemblance to the boats of even 20 years ago.
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