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Polaris is a sailboat designed by Gary Mull and built by TPI, Rhode Island, USA. Bay sailing or blue water, shes weatherly, stiff and fast and easily handled. She features a large roach mainsail with a fractional self-tacking headsail. Easily single-handled with all lines leading to the cockpit (I have sailed her alone from Portland, Maine to Bristol Rhode Island and several times from Portland, Maine to Penobscot Bay). The large Doyle Slackpack mainsail is raised with the help of a Harken #44 electric winch on her 57 Foot carbon-fiber mast. The sail glides easily with low friction Harken luff slides. The head sail is self-tacking on a custom-made aluminum jib-boom controlled from the cockpit. She also has a Cruising Spinnaker in Sock. Shes an excellent sailor in all airs.
Equipment: FIN KEEL CAT sloop LOA: 38, LWL: 30 7. BEAM: 126, DRAFT: 46 HULL: Fiberglass White with Blue Waterline and Blue Sail Covers ENGINE: Yanmar 3 GMF 3-cylinder diesel and 3-blade Max prop. DESIGNER: Gary Mull Sails and Rigging: Fully battened Doyle “Stack Pac” mainsail with low friction luff slides, “Camber Spar” self-tending jib and jib down haul, Cruising spinnaker in Sock, All sail controls lead to cockpit through stopper banks, Harken #44 electric winch for main halyard and main sheet, Barient #48 winch, Hall Quickvang, ELECTRONICS: Raymarine C125 Multifunction Displays, Raymarine Radar, Autohelm 6000 Autopilot, Autohelm wind, depth, speed, log in cockpit with nav station repeater, all instruments integrated with C125 Display. Icon VHF Radio, “Polaris” has an Edson radar post mounted aft, with Raymarine radar. Deck HW: Simpson Lawrence “Sea Wolf” electric windlass, bow roller with Bruce anchor; swim/boarding platform with shower; radar pole with dinghy, hoist and bracket, dark blue dodger and sail cover. OTHER: 3 batteries in 2 Banks, Racor fuel filter, Marine toilet w/Y-valve and 40 Gal holding tank, Force 10 three burner stove with oven, Grunert 110V/12V refrigeration/freezer, microwave oven, pressurized and manual water.
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)
Free standing sloop rig with ‘Bierig’ jib.
Extended version of the FREEDOM 36.
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