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2012 9.9 Yamaha outboard engine with a long shaft. Not sure how many hours, but took a couple of trips to the Bahamas and the Keys from St. Augustine. Some of the journeys were of course under sail. Good engine, recent tune up.
Equipment: “Purrfect C.” is Iroquois Catamaran built in England. She comes with a main, 2 jibs and a spinnaker. She was completely re-fit about 8 years ago with all new electric and plumbing.. There is a galley with sink and stove with engine, water tank, head, 2 cabins and table with bench seating. Can sleep 6 semi-comfortably. There is a trampoline up front and lots of storage, 12 volt system with solar panels to charge the battery and to use lights in/out of the boat. Even though she is a 1978 boat, she has been maintained and is solid with a fiberglass over a wood frames. The hulls were painted painted blue and she had a bottom job with the best bottom sealant about 2 years ago.The top deck was recently painted, as well as new floors added, and beautiful custom made varnished hatch. I had a survey about 1.5 years ago. She is fully insured. Please just call if you are interested.
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)
The MKII is a development of the original IROQUOIS 30.
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