Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

We will occasionally send you relevant updates. You can opt out or contact us any time.
  • 1 / 13
  • 2 / 13
  • 3 / 13
  • 4 / 13
  • 5 / 13
  • 6 / 13
  • 7 / 13
  • 8 / 13
  • 9 / 13
  • 10 / 13
  • 11 / 13
  • 12 / 13
  • 13 / 13

1979 Gulfstar Sailmaster 47 Ketch Motorsailer

Listed
Expired
$99,000 USD

Seller's Description

We have traveled around and lived aboard EscapeCaye in Gulfport, MS since Covid. We’re moving on and she needs a new owner with the time and motivation to finish her refit.

Unique starboard walk-through cockpit coaming makes boarding or provisioning a pleasure instead of a chore. Full standing height throughout. Large swim platform made of StarBoard. 2 full baths with 300 gallons of fresh water, macerating freshwater head forward, and a composting head aft (she was never equipped with a holding tank so the LectraSan can be serviced or there’s room for a holding tank below). With 2 onboard she goes about 3 weeks between water and composting media reloads. 200 gallon fuel capacity using approx 1.25 gallons per hour motoring at 7 knots. 16000BTU reverse cycle AC, exterior window shades, and blinds keep her liveable year round.

Take delivery in Gulfport or I will deliver her to Zern in Pensacola at buyer’s request.

Equipment: 3 x Kilovault 12V 180Ah 12V PLC AGM lead carbon bank (tolerant of partial state of charge and approx 5kWh usable power due to lead carbon technology), 60A shore charger, and 2kW inverter installed. AGM charging is sped up and optimized by a 210A Sterling alternator to battery charger and 130A auxilliary alternator. New water heater installed. New faucets installed. Seagull drinking water filtration system. 6 cylinder Perkins was rebuilt by previous owner and looks/runs great. Hull was painted with Awlgrip epoxy.

Masts are off and undergoing refit/upgrades from in-mast furler to track system at Zern Rigging in Pensacola. Work is underway with more than $12k of the rig refit cost already paid.

We decided to go electric and refit the galley with induction cook top, inverter microwave, and electric oven chosen for their efficiency. We love how it all works. I have used zero propane in my time aboard except for outdoor grilling.

Extensive list of systems already purchased and ready to be installed include 15kWh 24V lithium bank (specific for the inverter), Magnum 4kW hybrid inverter-charger with advanced control panel, fuel efficient 3kW Yanmar marine diesel generator, new chainplates, new furler, 6000BTU AC for aft cabin, Victron battery monitor, 700W of solar with Victron controller, wind generator, and more.

The hybrid AC electrical was designed with off-grid life in mind. 4kW hybrid inverter-charger fed by a 24V 15kWh (600Ah) lithium bank provides more than 30A at any time with power to spare. With the 3kW Yanmar marine diesel generator running there should be more than 50A available to power the boat, or the generator should fully charge the lithium bank in a 4-5 hour duty cycle.

Advertisement

Specs

Designer
Vince & Richard Lazarra
Builder
Gulfstar Yachts
Associations
?
# Built
79
Hull
Monohull
Keel
Fin
Rudder
Skeg
Construction
FG

Dimensions

Length Overall
47 4 / 14.5 m
Waterline Length
40 5 / 12.3 m
Beam
13 9 / 4.2 m
Draft
5 6 / 1.7 m
Displacement
38,000 lb / 17,237 kg
Ballast
10,500 lb / 4,763 kg (Lead)

Rig and Sails

Type
Ketch
Reported Sail Area
923′² / 85.8 m²
Total Sail Area
800′² / 74.4 m²
Mainsail
Sail Area
318′² / 29.5 m²
P
41 0 / 12.5 m
E
15 5 / 4.7 m
Air Draft
?
Foresail
Sail Area
483′² / 44.8 m²
I
49 6 / 15.1 m
J
19 5 / 5.9 m
Forestay Length
53 2 / 16.2 m

Auxilary Power

Make
Perkins
Model
?
HP
?
Fuel Type
Diesel
Fuel Capacity
195 gal / 738 l
Engine Hours
?

Accomodations

Water Capacity
300 gal / 1,136 l
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
9.4 kn
Classic: 8.53 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.

Formula

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

9.37 knots
Classic formula: 8.53 knots
Sail Area/Displacement
13.1
<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.

Formula

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.
13.07
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
27.6
<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.

Formula

Ballast / Displacement * 100

27.63
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
255.7
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.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
255.65
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
41.4
40-50: heavy bluewater 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.

Formula

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
41.35
<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
1.7
<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.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
1.65
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Available as a sloop or ketch.

This listing is presented by SailboatListings.com. Visit their website for more information or to contact the seller.

View on SailboatListings.com

Advertisement

Embed

Embed

Embed this page on your own website by copying and pasting this code.

Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

We will occasionally send you relevant updates. You can opt out or contact us any time.
Measurements:

©2024 Sea Time Tech, LLC

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.