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 √LWLA 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)
The Valiant 42 is a 1992 evolution of Bob Perry’s groundbreaking Valiant 40 design by Valiant Yachts. The boat was sold as a low volume semi-custom long distance cruiser.
The original Valiant 40 hull remained unchanged while the deck mold was updated to offer more options to the interior layout. The original Valiant 40 layout with an offset companionway was complemented by a center entry options. Berths arrangements were updated into two flavors – a large queen berth in the forward peak or a pullman style double-berth offset to port.
After gathering feedback from the Valiant 40 owner community and two decades of sailing experience, the rig was updated sporting a two foot bowsprit to bring the center of pressure further forward. There were also some small tweaks to the keel.
The Valiant 42 ceased production in 2011 when Valiant Yachts closed its doors due to an economic downturn. For a full breakdown and history check out the Valiant 40 article.
Shoal draft: 5.5'.
Deck salon version, VALIANT 42RS, was also available at this time.
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