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Seller's Description

We’ve been sailing her this year, but have been looking to upgrade to a larger boat for my family. Wyvern is a great racer, with more spartan accommodations and interior, but she has been a great starter boat for us the past 2 years. Two new batteries and fresh bottom painting for this season!

Equipment: The Basics: Fuel tank 10 gal Water tank 10 gal Displacement 6800 pounds Pressure cold water Sleeps 5-6 Volvo 18 hp diesel engine - Unknown hours (Serviced in April 2023)

Sails & Rigging Mainsail (Good Cond), 115% Genoa (Good), Roller Furling foresail, lazy jacks installed on mainsail, Mainsail cover

Deck/Hull (Bottom sanded and painted in April 2023) Cream hull and deck, bow and stern pulpits, traveller and car, 2 Lewmar sheet self tailing winches 2 speed; 2 single speed halyard winches on coachroof, double lifelines, cockpit bimini, wheel steering, swim ladder

Salon and Interior Teak and holly sole, settee berths port and starboard, folding dining table, twin/double aft cabin, bow v-berth, aft head, 2 opening hatches, 1 solar ventilator fan

Galley Stainless steel sink, propane 2 burner stover and oven, icebox, cold pressure water, cupboards and drawer storage

Electronics Tacktick wireless depth and wind speed/direction gauges (Water speed doesn’t register), compass in binnacle, Raymarine ST6000 autopilot (We use Navionics on an iPad for navigation)

Electrical 2 12-volt marine batteries (Both new in June 2023), shore power wiring, cabin lights (some need new bulbs)

Mechanical Auto electrical and hand bilge pumps

General Safety Danforth anchor with chain and rode, anchor roller, 1 fire extinguisher, life ring

Miscellaneous Waste tank is not hooked up for use, but is present Water tank still winterized (not used this year) Small leak at raw water impeller, drips when using engine but does not impact performance - should be looked at in the future.

Specs

Designers
?
Builder
Thames Marine
Association
Snapdragon & Mirage Association
# Built
?
Hull
Monohull
Keel
Twin
Rudder
?
Construction
FG

Dimensions

Length Overall
29 0 / 8.8 m
Waterline Length
25 3 / 7.7 m
Beam
10 5 / 3.2 m
Draft
4 9 / 1.5 m
Displacement
8,270 lb / 3,750 kg
Ballast
3,550 lb / 1,610 kg

Rig and Sails

Type
Sloop
Reported Sail Area
353′² / 32.8 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
Volvo Penta
Model
?
HP
18
Fuel Type
?
Fuel Capacity
25 gal / 95 l
Engine Hours
?

Accomodations

Water Capacity
30 gal / 114 l
Holding Tank Capacity
?
Headroom
?
Cabins
1

Calculations

Hull Speed
7.7 kn
Classic: 6.74 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

7.66 knots
Classic formula: 6.74 knots
Sail Area/Displacement
13.8
<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.
13.81
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
42.9
>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

42.93
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
228.9
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
228.92
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
21.0
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
21.03
<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
2.1
>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
2.08
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Available with fin keel, draft 5ft / 1.52m

This listing is presented by SailboatListings.com. Visit their website for more information or to contact the seller.

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