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Seller's Description

The Corsair 31 is a true performance cruiser. It features comfortable accommodations for 4-6 adults, a spacious cockpit, “acres” of deck space and standing headroom below. The performance oriented sailplan provides the experienced sailor with exhilarating performance yet is manageable enough that the boat can easily be handled by virtually anyone. This 31 is a flier, fast and light weight. Originally delivered as a the first Corsair race 31 designated “R”, with only the starboard & port settees, no galley and no head. It was modified to add back a light weight 1/2 wall 1/2 curtain head space with a vanity and sink and a location for a porta potti.

YouTube 360 Video: youtu.be/bbIRslzf9mo

YouTube Video Sailing: youtu.be/VmxLXwC2rWE

Significant upgrades in the past couple years include: 2020 Suzuki 9.9 EFI w/ power tilt 2020 Raymarine ST2000 Tiller Pilot New Dodger & Bimini Garmin AIS module New Forestay New Running Rigging West Marine 810 MCA Group 27 battery

Engines 2020 Suzuki 9.9 EFI w/ power tilt Remote steering, throttle and shift Electric start Alternator 2 x 3 gallon gas tank

Accommodations This boat with its aft cockpit arrangement sleeps 4-5. The v-berth is a large comfortable space for a couple. The main cabin settees convert into a large double bunk. Then main cabin also has a pipe berth that is perfect for children, or an adult sleeping when underway. There is ample storage space behind and under the settees. The head compartment is located to port of the daggerboard trunk in custom built compartment. There is a light weight composite half bulkhead topped with a privacy curtain. Inside is a vanity counter with a sink that discharges overboard. The toilet is a porta potti chemical toilet.

Galley There is no galley. For cruising the owners brings along a portable propane stove and whatever else they need for cooking and eating.

Equipment: Electronics 2019 Garmin GPSMAP 7608 2018 Garmin AIS Receiver Garmin 19x NEMA 2000 receiver/antenna Garmin 18 inch HD radar on mast Raymarine ST2000 Tiller Pilot x 2 AutoBuddy Remote Control for autopilot West Marine VHF radio

Electrical West Marine 810 MCA Group 27 battery (new 2018) Circuit breaker panel with battery charge meter Renology 75W flexible solar panel and BMS Interior LED lights in the main cabin; florescent light in the v-berth Running lights Deck light Steaming light

Sails North Norlam mainsail August 2014 North Norlam jib August 2014 North Norlam Code 65 Screecher May 2019 Lidgard Pentax Jib 2020 Calvert Dacron jib 1998 Calvert Spinnaker 1998, lightly used Calvert Screacher 2009 Tides Marine sail track makes raising, reefing or lowering the main near effortless Mack Pack mainsail cover system Jib roller furling system is a Harken Unit 0 New forestay (2018) Facnor 2500 continuous line furler for the Screacher

Deck 42’ 6” Omohundro carbon rotating mast Aluminum boom and bow sprit Competition Composites (Phil’s Foils) Daggerboard 2010 Custom raised cockpit seats 4 Self-Tailing Harken Halyard/Sheet winches 12:1 Harken mainsheet system Harken Traveler Colligo synthetic capshrouds with 4:1 purchase synthetic adjusters Stainless Steel forestay (new 2018) 2 New Spinlock Quad clutches (2018) All new running rigging - Halyards & Sheets (2018) Gray Sunrise bow, wing and aft nets (2018)

Additional Beige interior carpet liner Dodger / Bimini by Thurston Sails, Bristol, RI (2018) Fortress FX-16 anchor with chain and rode SeaDek on the cabin sole Custom pipe berth in the main cabin (port side) Aft wing nets Boarding ladder Tiller extension Cabin table Docklines Fenders (4 large size) Trailex aluminum trailer with disc brakes (serviced 2015)

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Specs

Designer
Ian Farrier
Builder
Corsair Marine
Associations
?
# Built
?
Hull
Monohull
Keel
?
Rudder
?
Construction
FG

Dimensions

Length Overall
30 10 / 9.4 m
Waterline Length
31 0 / 9.5 m
Beam
22 0 / 6.7 m
Draft
1 4 / 0.4 m 4 11 / 1.5 m
Displacement
4,600 lb / 2,087 kg
Ballast
?

Rig and Sails

Type
Sloop
Reported Sail Area
645′² / 59.9 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
47 6 / 14.5 m
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
11.8 kn
Classic: 7.34 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

11.75 knots
Classic formula: 7.34 knots
Sail Area/Displacement
37.3
>20: high performance

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.
37.31
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
?

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

?
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
76.2
<100: Ultralight

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
76.18
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
3.7
<20: lightweight racing 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
3.71
<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
5.4
>2.0: better suited for coastal cruising

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
5.39
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Beam folded: 8.16’.
Available in aft cockpit (AC) and center cockpit (CC) models. Each available with ‘R’ (racing option) with bowsprit and carbon spar.
This design, of one variant or another, has proved to be one of the most popular of all the Farrier/Cosair designs.
(Evolved from the F-9A, which was offered as a stock plan.)

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