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Seller's Description

This 1977 Dufour 31 may be vintage, but it’s packed with charm and functionality. Perfect for cruising or couples seeking a cozy liveaboard experience! She is well kept and turn key ready, as well as beamy, which makes it deceptively roomy down under. The cockpit is well designed and can easily be single handedly sailed.

We have lived on the Condor for 7 years now and really don’t want to let her go, but it is time to upgrade to something bigger. She has been all up and down the east coast and Caribbean. Note that we are looking to sign her over to a new owner around the last week of April, we will still need to live on the Condor until then. The slip it’s currently in at Sunset Marina in Key West and is transferable which is huge. At $1355 a month, that’s the cheapest you can find around here, and for a couple living aboard, the difference of having a traditional apartment may very well save you as much as the boat is worth in a couple years. Also fun fact, in Florida the Condor is considered an antique, meaning you will save hundreds a year on property tax.

Maintenance and Upgrades: We’ve spared no expense in keeping the Condor shipshape with regular maintenance, and with upgrades including new rigging, batteries, and instrumentation.

West Marine 12’ Dinghy and 8hp M outboard is included, starts every time and title in hand.

Addressing Concerns: While she’s in great condition overall, there are a few aesthetic issues and minor repairs to consider. We’re transparent about these and happy to discuss solutions with potential buyers.

Equipment: Maintenance and Upgrades: -All new standing rigging 2023 (everything) -New Lithium ion batteries 2023 -victron bluetooth monitoring for batteries 2023 -New exhaust elbow 2022 -New raw water pump 2023 -New Thermostat 2022 -New genoa (however is slightly too large, would be easy to trade/ replace) -New 2018 Ray marine instruments (50% installed, remaining parts on board and ready) -LED remote controlled light strips 2020 -Garmin GPS -gps/cellular Ipad for navionics -New Ipe handrails 2019 (brazilian walnut, easy to care for vs teak, very strong) - West Marine 10 inflatable dinghy, title in hand - Mercury 15hp 2 stroke outboard for dinghy - Toshiba air conditioner window unit that keeps it nice and cool in the Florida heat

Other notes about the Condors systems - Original Volvo Penta MD7a, works wonderfully, 13.5 hp -180 watt solar panel (plenty of room above bimini for extra) 300ah LiPO batteries (space for another 300 as well) - 8 Gal diesel fuel tank (can last around 24hrs at cruising speed) - Danfoss compressor, keeps the fridge colder than your ex’s heart - 30 gal fresh water tank - 30 gal black water tank - typical jabsco marine head with Y valve for black water tank/ overboard discharge - 2 foot pedal operated sinks with high quality filtration - Icom VHF radio - AIS instruments installed but not set up - Colman 2 burner camping stove

Addressing Concerns: While she’s in great condition overall, there are a few aesthetic issues and minor repairs to consider. We’re transparent about these and happy to discuss solutions with potential buyers. Most issues are just aesthetic Deck paint Accent hull paint Older bimini canvas and sail cover Last haul out was 2016. You may want to think about taking her out and re painting bottom in the next couple years The jib furler pops out of socket from time to time, still functions, but might be something worth replacing eventually Genoa is slightly too large, will have to sell or trade for a smaller one The spreader lights need to be re wired if desired

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Specs

Designer
Michel Dufour
Builder
Dufour Yachts
Associations
?
# Built
900
Hull
Monohull
Keel
Fin
Rudder
Skeg
Construction
FG

Dimensions

Length Overall
31 0 / 9.5 m
Waterline Length
22 11 / 7 m
Beam
12 0 / 3.7 m
Draft
4 11 / 1.5 m
Displacement
9,600 lb / 4,354 kg
Ballast
3,690 lb / 1,676 kg

Rig and Sails

Type
Sloop
Reported Sail Area
395′² / 36.7 m²
Total Sail Area
395′² / 36.7 m²
Mainsail
Sail Area
170′² / 15.8 m²
P
33 3 / 10.2 m
E
10 2 / 3.1 m
Air Draft
?
Foresail
Sail Area
225′² / 20.9 m²
I
37 7 / 11.5 m
J
11 11 / 3.7 m
Forestay Length
39 5 / 12 m

Auxilary Power

Make
Volvo
Model
MD7A/MD2B
HP
?
Fuel Type
Diesel
Fuel Capacity
13 gal / 49 l
Engine Hours
?

Accomodations

Water Capacity
20 gal / 76 l
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
6.4 kn
Classic: 6.43 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

6.39 knots
Classic formula: 6.43 knots
Sail Area/Displacement
14.0
<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.
13.99
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
38.5
<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

38.49
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
352.3
>350: ultraheavy

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
352.26
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
25.4
20-30: coastal cruiser

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
25.36
<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
<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
1.98
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Not to be confused with the DUFOUR 3800 AKA DUFOUR 31 FRERS (1980).
Tall Rig-
I: 41.20’
J: 11.97’
P: 36.90’
E: 10.20’

Shallow draft: 4.75’
One owner reports Volvo MD2B as original engine.

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