Seller's Description
1975 D&M Thistle 3390 Asking $2400 OBO (no trades) Milan, OH (near Sandusky)
The boat is ready to sail right now as it is, but it would need a few minor upgrades if you wanted to race competitively. I have the Ohio title for the boat in my name, and its registration is good until 2024. The trailer is currently unregistered, but it’s very easy to register a small trailer in Ohio with no title needed (Just need to weigh the trailer on a certified scale and bring the weight slip to the BMV).
Functionally, the boat is in very good condition. It has high quality Harken hardware, teak rails, and black aluminum spars. The tanks are water-tight, and the centerboard trunk has been reinforced. Aesthetically, the gel coat is faded and has a few scratches, but it could be brought back to 90% with polish and wax. The teak is in solid condition, but it needs cleaned and oiled.
Needs… - Spinnaker sheets - OH number stickers
Equipment: - Aluminum trailer with good condition tires and axles (light enough to tow with a Honda Fit lol) - Very good condition North Sails main and jib for racing (always stored inside, only used 4-5 times, need re-numbered for racing) - Spinnaker and spinnaker pole (also needs re-numbered for racing) - Not as good condition set of practice sails (shown in pictures) - Poor condition mast-up mooring cover (has a few tears, but it still works to keep the sun off)
Specs
- Designer
- Gordon K. (Sandy) Douglass
- Association
- Thistle Class (USA)
- # Built
- 4000
- Hull
- Monohull Dinghy
- Keel
- Centerboard
- Rudder
- ?
- Construction
- Molded Ply/FG
Dimensions
- Length Overall
- 16′ 11″ / 5.2 m
- Waterline Length
- 16′ 11″ / 5.2 m
- Beam
- 6′ 0″ / 1.8 m
- Draft
- 0′ 5″ / 0.2 m — 4′ 5″ / 1.4 m
- Displacement
- 520 lb / 234 kg
- Ballast
- ?
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 191′² / 17.7 m²
- Total Sail Area
- ?
Mainsail
- Sail Area
- ?
- P
- ?
- E
- ?
- Air Draft
- ?
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
- 0
Calculations
- Hull Speed
-
10.3 kn
Classic: 5.52 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
- Sail Area/Displacement
-
47.5
>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.
- 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
- Displacement/Length
-
46.9
<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
- Comfort Ratio
-
4.3
<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
- Capsize Screening
-
3.0
>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
Notes
Spin area: 220 sq ft.
Other builders:
Northwest One Design
Great Midwest Yacht Company
Doug Laber
Box 364
140 E Granville Street
Sunbury, OH 43074
740-965-4511
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