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1981 Catalina 27
Tiller steering, Dodger, North main with sail cover and 130% roller furling Genoa (2015) in excellent condition. 1 symmetrical spinnaker, pole, all sheets and rigging 30 HP Atomic 4, electronic ignition, electric fuel pump, new impeller, alternator belt, temperature sending sensor, & coil (2019) quiet and fast AC shore power, Plastimo bulkhead lit compass, Depth and Speed indicators, Navico TP10 Tiller Pilot, VHS Radio; Standard Horizon Matrix AIS/GPS GX2200; If you send a distress call this tells the Coast Guard your exact GPS position. No search necessary, just rescue. 2 Batteries w/selector, good condition, battery charger/maintainer CO2 Detector 2 burner alcohol stove, pressure water, ice box with upgraded insulation Enclosed head w/20 gallon holding tank Extras; All standing rigging, turnbuckels and lifelines replaced 2012 Topsides painted 2018, Bottom painted Spring 2020, no Catalina smile, 2 Danforth anchors and 2-150 ft. rodes New cockpit manual bilge pump, 12 volt 2 speed cabin fan, Fitted Tufted Topper mattress pad in v-berth, Cutlass bearing and stuffing box renewed 2017, Martec folding prop, Lazy Jacks on mainsail, Solar pwd vent above V-berth, All windows removed and resealed with Catalina Direct kit 2017 Passed US Coast Guard vessel safety check 2019, decal is on mast Sleeps 5 Turnkey, ready to sail! Can be delivered within 400 miles with trailer for a fee. Can be seen at Barker’s Island Marina, dock D slip 37 Includes original photo of breaching Orca taken July 3rd, 2010 in San Juan Islands by owner. Includes; Custom fit 2005 Cradle Ride Trailer, Surge Brakes Thanks for your interest. All reasonable offers considered.
Don 608-516-3855
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)
Originally called CAPRI 18. (before 2000).
Photo courtesy Adam Hunt.
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