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Custom Roake 50 Catamaran For Sale By Owner Location: Rio Dulce Asking: $325,000 (USD)
S/V Panta Rhei is a 2012 Custom Custom Roake Guenter 50 catamaran, for sale by owner. The design concept for Panta Rhei was formulated in 1981. We wanted a fast sailing catamaran with comfortable but minimal accommodation capable of cruising the oceans of the world and at the time couldnt find anything that suited our needs. The design and construction of Panta Rhei was an evolution that occurred over a number of years and involved a cast of naval architects, a variety of construction methods, what at the time were cutting edge technologies and the development of novel approaches to implementing the smooth working of all components. Panta Rhei has been our only home since 2014 and part time prior to that. While we never did sail the oceans of the world as hoped, we cruised extensively from Nova Scotia to the Bahamas and throughout the Caribbean. During that time, Panta Rhei proved her sea keeping abilities, potential for speed and ease of handling. She is a capable world cruiser and all that has prevented us from venturing further afield is our advancing maturity. While Panta Rhei will not appeal to those who desire a spacious catamaran suitable for families or entertaining, she is perfect for an individual or couple who is minimalist in accommodation needs, wants the option for speed and who appreciates safe and easy sailing.
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)
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