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pics coming, my interior ones won’t upload. 1973 Gulfstar 41 Ketch with the deep keel (extremely rare production, estimated 14 made) that much improves performance.
Been refitting her since I bought her in September of 2019. At this point, its finishing the final finishes. I will be continually plugging away at them but have decided to part ways with this boat for personal reasons. The refit has left her with essentially new bones just requiring the finishing bits.
The boat received an entire new barrier coat around 2008, completed by workers of Osprey Marine in Deale. So blistering is not a problem on this boat. At this point, she is a fully electric (minus its heater) sailboat with nearly all new wiring across all voltages.
If you want to return it to a diesel propulsion, still reach out/make offer. I would take the electric motor system with me. The way the boat was redesigned still allows it to be a diesel propelled boat easily.
The layout is modified from original Gulfstar Layout. Aft cabin has been converted from two twins into roughly a Queen size bed, each with night stands on either side. It also was redesigned to accomodate the Refleks 2000KV, which if removed would provide a seat alongside the bed. Aft head has been modified to provide a seat while showering. The hallway has been modified to create a good, large battery bank location which did not exist in the original design (currently has 400AH of 12V, you could likely fit 1000AH). This is also where I’ve designed a dresser that maintains good airflow (no moldy clothes!). The kitchen has a front load fridge and a 3 level pot/plate storage hole (fits a crockpot, full size pot, pans, plates and more, its HUGE). Salon has been reconfigured from the original dinette layout with two bars of seating on either side. table in the middle around the mast, with a drop in piece to make the salon a big U-shaped seating arrangement.
The equipment list of this boat is massive and all new. I’m flexible in the sense that if you don’t want a piece of it, I would gladly remove it and lower the price.
Equipment: Electric Yacht QT 20.0 Motor installed April 2022, 30 hours. - 48V system with regeneration. - Victron Quattro 3000/48V - Victron Cerbo GX - Blue seas inverter switch (allows you to run both 120V Panels (including he AC) n one 30AMP Service) - Four 48V/96ah Dakota Lithium Batteries for a total of 400ah battery bank. - I cannot say how much i love this system and am sad to let it go.
All New since 2020
-16,000 BTU Webasto Reverse Cycle AC (2022) -Refleks 2000KV with 2 rads, this kept the boat above 68F all winter and below 50% humidity. -All new plumbing (pex) -All new 120V Wiring, 12V is almost all new. -LED Lights -All 12 NewFoundMetals Ports. -Jabasco Freshwater Electric Flush, Holding Tank, hoses -All new 120V and 12V panels, -2 30amp smart plugs -Isotherm 4.5 CUFT refrigerator 120V/12V -Dometic Freezer 120V/12V -New bilge pump switch/float -Renogy 40amp solar charge controller 1 12V 100w panel. -New self tailing Lewmar Winches for Jib. -Victron Battery 712 monitor -New Jib Sheets, Jib Halyard, Main sheet, main halyard, traveller control. - New Lewmar jib winches
Sails -Hood Main, Mizzen, 150% genoa, working jib all in very good condition -Downwind jib from Australian racing sails
Cockpit Cushions, Bimini.
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)
Dimensions for ketch rig.
See GULFSTAR 41 for more details.
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