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Amazingly refitted Irwin Citation during 2020/2021/2022: Mast rebedded/ standing-running rigging replaced/2nd spreader added along w/ Engine rebuild w/new motor mounts-repacked stuffing box. 4’8” shoal draft. Sanitary hoses/macerator pump replaced. Hauled-hull painted, navigation lights now LED, VHF radio/autopilot, depth transducer AM/FM Radio/4 speakers. Isotherm refrigeration, “Force 10” 3 burner gimbaled stove/oven. Mantus (44lb) anchor w/mantus swivel-125’ 5/16 G4 anchor chain/150’ anchor rope-manual windless. Additional 22lb. Delta anchor. Main sail w/stack pack and built in reefing points. Stack pack-new line 175’. Inside decking replaced w/ teak and holly(easy access to bilge compartments). 50’ 30 amp power cord. 8’4” roll up dinghy (West Marine) w/3.3 HP Mercury outboard. Main sail and roller furling genoa not new but in good working order. Additional electronics: radar, GPS plotter, wind instrument hand held VHF radio, battery-pack/inverter. Swimmer and Divers favorite: Transom lowers to make steps into water off stern. Please contact me for detailed information and additional photos….or call: 704-941-7747
Equipment: See above
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)
Shoal draft: 4.58’
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