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The Bill Shaw designed P-34 is a comfortable stable cruiser that is a pleasure to sail. It can accommodate 5 or 6. These boats have retained their value over the years, and this is a very economical way to cruise as a couple or family. We have owned Marbella since 2005 and due to advancing age are now selling her to downsize to a daysailer. Recent replacements include rudder 2020, marine batteries 2021, dodger 2017, head 2010, lazy jacks. Fairclough cover. 2005 Zodiac and 8hp Tohatsu included. 2022 launching included. Contact us to discuss or view.
Equipment: Universal diesel 21 HP Sails - main, 150 Genoa, cruising spinnaker - all serviceable Compass, VHF, Depth/Knot/Windspeed Pedestal mounted GPS/Chartfinder 2 burner propane stove Jib roller furling
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)
Keel/CB version also available. Draft BD: 7.6’/BU: 3.83’
Temporarily reintroduced (1995?) under the short lived Cal-Pearson Corporation.
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