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Seller's Description

1975 Dufour 34 Excellent sailing boat built by iconic French designer Michel Dufour and a larger version of the very successful Arpege 30. Dufour has an excellent track record that stands for more than 50 years. They are still making boats and remained building boats when others have folded. SIREN is a turnkey cruiser / racer with a Disp./Len ratio of 299.59 which makes her a safe boat for blue water adventures. She has been cruised to Mexico several times by the prior owner. This boat is in great condition and very clean. New cushion covers, interior in excellent condition, new head, all thru hulls in excellent condition, new bilge pump, new thru hull hoses replaced, swim ladder, Chart plotter, davit, Raymarine Auto Pilot, Roller furl, 2 new head sails with UV protective cover, Ice box, new bottom job, all hatches painted, engine in good working condition. She was raced a great deal and has a great sail inventory with a selection of racing sails and cruising sails some being brand new and a spinnaker. The interior is a full liner attached to the hull making it virtually waterproof saving you from the pesky leaks many other designs have. I have a Survey from 10/2018, all major items on survey have been attended to. See full inventory below. The boat is turnkey and sailed most every weekend on the bay with some costal cruising. This would make a great cruising boat which was my initial intention. It is a great performer and seaworthy. Moving out of state forces sale. I will miss this boat immensely it has been a fun boat to sail.

Equipment: Specs: Builder: Dufour Designer: Michel Dufour Keel: Fin Skeg Rudder Hull Shape: Monohull

Dimensions: LOA: 34 Beam: 10 9 Draft: 5 10 Displacement: 10,300 LBS Hull Construction: Fiberglass

Engine: Brand: Volvo Penta (Rebuilt Injectors) Year: 1975 Type: Inboard Fuel: Diesel Prop: 2 blade Prop Engine Power: 25HP Hours: Unknown Good Condition

Tanks: Freshwater: 2 Bladder 70 gal. Fuel Tank: Stainless 21 gal. Holding Tank: Bladder 15 gal.

Accommodations: Number of Single Berths: 2 Number of Double Berths: 2 V berth and dinette Number of Heads: 1 Table: 1 Storage: many, foul weather gear locker (NEW) Cushion covers. (red)

Electronics / Electrical VHF JRC RADAR 1800 CHART PLOTTER Compass Aquameter Log Speedometer (non functional) Signet Depth Sounder (water logged display) Signet Wind Speed and Direction (erratic) Raymarine Autopilot Batteries: 2 Deep cell 2018 Smart Charger 2 Sears 12V fixture lighting, and main breaker system

Pluming: Whale foot pump: Galley: 1 fresh H20 1 sea water Head: 1 fresh H20 Water Filter: inline (not used) Electrical Water Pump: Galley sink and Head Shower and Sink Bildge pump: 2 total #1-Electric: (NEW) (not installed) and #2 High Volume Manual Pump Head (NEW) Macerator head overboard pump

Galley: Ice Box and Sink Three Burner Eno LPG stove with Oven Propane tank with shut off valve at stove

Sail Inventory: Main Sail: 2 #1 Good 2 reefs #2: older Head Sail: 2 (NEW) with sumbrella protecting, 2 racing (good & excellent), 1 older good, 1 great-excellent condition only loose sumbrella stiching. Spinnaker: good (spinnaker pole) Jib Furling: Harken Lazy Jacks

Deck Equipment: Stainless 6 step removable ladder 25# CQR anchor Chain to 3 Strand Nylon rode 300ft aprox. Radar Mast Small Davit (engine lift) Boom Brake

Miscellaneous: PFDs Safety equipment Fire Extinguishers Boat hook Various lines Fenders

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Specs

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

Dimensions

Length Overall
33 7 / 10.2 m
Waterline Length
111 6 / 34 m
Beam
32 9 / 10 m
Draft
16 4 / 5 m
Displacement
11,400 lb / 5,171 kg
Ballast
4,000 lb / 1,814 kg

Rig and Sails

Type
Sloop
Reported Sail Area
516′² / 47.9 m²
Total Sail Area
516′² / 48 m²
Mainsail
Sail Area
220′² / 20.4 m²
P
38 2 / 11.6 m
E
11 6 / 3.5 m
Air Draft
?
Foresail
Sail Area
296′² / 27.5 m²
I
43 7 / 13.3 m
J
13 7 / 4.2 m
Forestay Length
45 8 / 13.9 m

Auxilary Power

Make
Volvo Penta
Model
MD 28
HP
25
Fuel Type
Diesel
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
7.0 kn
Classic: 6.76 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

7.0 knots
Classic formula: 6.76 knots
Sail Area/Displacement
16.3
16-20: good 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.
16.3
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
35.1
<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

35.08
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
309.6
275-350: heavy

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
309.6
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
26.5
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
26.5
<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
1.9
<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
1.91
<2: better suited for ocean passages
>2: better suited for coastal cruising

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