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1973 Gulfstar 41 Ketch No Motor


Seller's Description

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.

I’ve listed her twice. One with the electric motor (and equipment) and one without it if you want to install a new diesel.

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: All New since 2020

-16,000 BTU Webasto Reverse Cycle AC (2022) -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. -self tailing Lewmar Winches for Jib. -Victron Battery 712 monitor -New Jib Sheets, Jib Halyard, Main sheet, main halyard, traveller control.

Sails -Hood Main, Mizzen, 150% genoa, working jib all in very good condition -Downwind jib from Australian racing sails

Cockpit Cushions, Bimini.



Gulfstar Yachts
# Built


Length Overall
41 0 / 12.5 m
Waterline Length
33 0 / 10.1 m
12 0 / 3.7 m
6 0 / 1.8 m
22,000 lb / 9,979 kg
7,000 lb / 3,175 kg

Rig and Sails

Reported Sail Area
723′² / 67.2 m²
Total Sail Area
608′² / 56.5 m²
Sail Area
225′² / 20.9 m²
38 3 / 11.7 m
11 8 / 3.6 m
Air Draft
Sail Area
383′² / 35.5 m²
45 0 / 13.7 m
16 11 / 5.2 m
Forestay Length
48 1 / 14.7 m
27 3 / 8.3 m
8 5 / 2.6 m

Auxilary Power

Fuel Type
Fuel Capacity
Engine Hours


Water Capacity
Holding Tank Capacity


Hull Speed
8.3 kn
Classic: 7.7 kn

Hull Speed

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

8.29 knots
Classic formula: 7.7 knots
Sail Area/Displacement
<16: under powered

Sail Area / Displacement Ratio

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

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
<16: under powered
16-20: good performance
>20: high performance
<40: less stiff, less powerful

Ballast / Displacement Ratio

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

<40: less stiff, less powerful
>40: stiffer, more powerful
200-275: moderate

Displacement / Length Ratio

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

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
30-40: moderate bluewater cruising boat

Comfort Ratio

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)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
<2.0: better suited for ocean passages

Capsize Screening Formula

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)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
<2: better suited for ocean passages
>2: better suited for coastal cruising


Dimensions for ketch rig.
See GULFSTAR 41 for more details.

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