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Seller's Description

1977 Gulfstar 37 Sailboat Sirenia

This is a rare single-family boat. Originally custom fitted out by Ted Hood himself, it has been owned, since new, by a single family of professional mariners and yachtsmen. This trusted and proven bluewater boat has called Marblehead, MA; Boothbay, ME, and now Lake Champlain her ports of call and has ventured to the Bahamas, Florida, most of the Atlantic seaboard, the islands, and New Zealand, to name a few.

We love this boat. We are sad to see her go, but she deserves to be used and sailed and enjoyed more than we are. We want to see her go to a good home where she will be loved and cared for and maintained- and sailed.

Dont be fooled. Gulfstar made a number of motor-sailers and other boats that are not considered good sailors. This is not one of them. The 37 is a true fin-keeled, skeg hung rudder sloop with above average sailing performance for its age and size.

This is a cruisers, couple/family boat. Huge cockpit and cockpit lockers; roomy salon and head, comfortable stateroom. Tons of storage. Wide beam carried aft, comfortable in heavy seas and higher breeze. Surefooted, easy to manage, sails well, comfortable, and affordable. This well maintained 37 is a lot of boat for the money, and an excellent step up, possible live-a-board.

Ready to sail and use as she sits.

Many more pictures and much more information available. Sirenia has been a passion project of ours, happy to teach and guide new owners to learn all about her.

Price: $48,000 or best reasonable offer. Might consider partial trades for center console or lobster/picnic style boats.

Additional Options:

Inclusion of a Walker Bay 8 rowable/sailable dinghy is negotiable. A summer mooring at the Three Island Sailing Club in Colchester is negotiable. Winter storage at Champlain Marina in Colchester, VT is paid. Spring Launch is paid. For sale separately, Walker Bay 10 RIB with Honda 15 outboard on a trailer. $3,500. Pre-refit survey (2017) is available.

Equipment: Equipment/Features

Comfortable cruiser for a couple or family. Sleeps two comfortably, 4 for fun, and 5 or more underway as needed. Furlex headsail furling system Harken Self-tailing winches 6 sails, all in working/cruising condition: Main; Staysail, 150%, 135%, 130%, Working Jib. Newer A-sym Spinnaker in sock. AutoHelm ST6000 autopilot Well designed galley with Sea Frost chiller (2017) and Shipmate 2 burner stove/oven, easy to use underway. Repowered to Westerbeke 44 in 2017. Fewer than 100 hrs on the new engine. Professionally installed and maintained. Custom solid aluminum bronze alloy automatic feather prop by PF Luke of Boothbay, ME. Excellent handling in forward and reverse under power. Custom additional aft fuel tank with inline fuel pump to extend cruising range Custom additional forward water tank under v-berth Wide and easy companionway stairs, dog and human friendly. Exhaustive parts, manuals, and sourcing lists. Beautiful teak and veneer interior New halyards and running rigging (2016) New standing rigging (2016) Kerosene cabin heater Manual windlass Battery Charger and 30 am shore power Extra large dodger/bimini set up with matching sail covers and seat cushions

Upgrades/work: New Natures Head Composting toilet installed, with full solar power venting (2018) New Additional bilge pumps (Rule 2000 and 1100) installed (2018) New Starting and House batteries Comes with an extra large dog ladder (removable) for dogs to swim and board. New Inverter hardwired and installed (2018) New (bluetooth capable) stereo installed with additional cockpit speakers (2018) Installed 5 cabin Fans (2018) New solar vent van in v-berth (2019) New power oil lift pump (2018) Westerbeke 44 complete full repower/ professional installation (2018). Regularly professionally maintained since. New anchor rode and chain (2018) Complete bottom paint job (2022). Down to the glass, faired, new barrier coat, new bottom paint. No signs of blistering or osmosis. LED bulbs and spares/replacements throughout. Enormous parts and spares inventory. Lazy Jack System parts purchased and included, not yet installed. There are some known issues, nothing unusual or major, which we will happily point out.

Specs

Designer
Vince & Richard Lazarra
Builder
Gulfstar Yachts
Associations
?
# Built
151
Hull
Monohull
Keel
Fin
Rudder
Skeg
Construction
FG

Dimensions

Length Overall
37 0 / 11.3 m
Waterline Length
31 11 / 9.8 m
Beam
10 11 / 3.4 m
Draft
4 11 / 1.5 m
Displacement
19,500 lb / 8,845 kg
Ballast
8,000 lb / 3,629 kg

Rig and Sails

Type
Sloop
Reported Sail Area
614′² / 57 m²
Total Sail Area
650′² / 60.3 m²
Mainsail
Sail Area
285′² / 26.5 m²
P
39 3 / 12 m
E
14 6 / 4.4 m
Air Draft
?
Foresail
Sail Area
365′² / 33.9 m²
I
46 1 / 14.1 m
J
15 9 / 4.8 m
Forestay Length
48 9 / 14.9 m

Auxilary Power

Make
Perkins
Model
4-108
HP
50
Fuel Type
Diesel
Fuel Capacity
30 gal / 114 l
Engine Hours
?

Accomodations

Water Capacity
80 gal / 303 l
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
8.2 kn
Classic: 7.58 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

8.23 knots
Classic formula: 7.58 knots
Sail Area/Displacement
13.6
<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.
13.56
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
41.0
>40: stiffer, more 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

41.03
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
266.0
200-300: 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
265.96
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
33.2
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.

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
33.2
<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
1.8
<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
1.76
<2: better suited for ocean passages
>2: better suited for coastal cruising

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