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2020 Refit including removal and re-bed of all top side hardware and rigging, removal of headliner and speckle paint of cabin. New custom rudder built and installed in 2020 Continuous upgrade of top-side hardware All Running Rigging is NEB Endura Braid Euro (Dyneema 12-strand core) in last 3 years all removed each winter Backstay cascade with Harken blocks Raymarine 2000 Tiller Pilot Autohelm Carbon Fiber Spin Pole Perfect running 11 HP Yanmar Tacktick Wireless Micronet Race Master System Sails: New Main Sail Cover 2020 Spinnaker (S 1.5 - AP shape, AirX 600) Doyle Built July 2022 Hoisted 3 times Dacron Main Sail Recut for Heavy Air Quantum Main Sail Carbon Fiber Radial Construction 2018 Quantum Light #1 2015 Quantum #2 2017 Doyle #3 - 2012 Dacron storm trysail 1.5 oz Chicken Chute Alley Cat comes with full original documentation including original MORC Rating Sheet, Original Specification record, Original Manual/Marketing Documents. Alley Cat is laying at Spurgeon Yachts in Stockton, Missouri.
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)
Shorter rig.
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