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2017 Shell Schooner Catamaran 18

Expired
$12,500 USD

Seller's Description

Shell Schooner Catamaran 18, 2017 and trailer This boat never ceases to turn heads. Great day sailor/overnight camping boat designed by Fred Shell boatworks of St. Albans, VT. Asking $12,500 obo. Fun aft cabin for sleeping or retreating from the weather. Large cushioned fore deck for Sunning, lounging and/or sundowners! Make: Shell Boats Model: Schooner Cat 18 Year: 2017 Condition: very good used boat Material: Marine plywood and epoxy

LOA: 18ft Beam: 8ft Draft: 15 inches Weight: Approx. 1200lbs Location: Melbourne, Florida Keel: fixed along full length of pontoons with stainless steel skid plate along full length of keel Helm: wheel, located in cabin Sails: sprit rig, white with red accent. Super easy to reef sails by rotating masts. Masts: Free standing. 24ft and 18ft Aux power: 2018 4-stroke Tohatsu 9.8 with remote shifter/throttle and electric tilt. 6 gallon fuel tank. Four step stainless steel boarding ladder located on bow

Trailer: galvanized Loadrite trailer. Brand new class C tires and new upgraded springs New class C spare tire and tire rack Battery: new AGM Can be towed by small SUV’s Rigged and launched in less than 15 min. Watch the video of launching one of these boats can be found on Shell boats website https://youtu.be/q6HjjrrvQIc

This is a fun little shallow draft boat your family will love. A unique and rare find. Please don’t hesitate to ask any questions.

or phone 321-419-3202

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Specs

Designers
J.R. (Rod) Macalpine-Downie
Dick Gibbs
Builders
Gibbs Boat Co.
Plastrend / Composite Technologies
MFG Boat Company
Association
Shark Catamaran Association
# Built
500
Hull
Catamaran
Keel
Twin Centerboard
Rudder
?
Construction
Wood/FG

Dimensions

Length Overall
20 0 / 6.1 m
Waterline Length
16 11 / 5.2 m
Beam
10 0 / 3.1 m
Draft
0 5 / 0.1 m 2 5 / 0.8 m
Displacement
300 lb / 136 kg
Ballast
?

Rig and Sails

Type
Sloop
Reported Sail Area
235′² / 21.8 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
?

Calculations

Hull Speed
12.2 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

12.18 knots
Classic formula: 5.52 knots
Sail Area/Displacement
83.9
>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.
83.93
<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
27.3
<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
27.27
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
1.2
<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
1.2
<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
6.0
>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
5.98
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Though he had already designed a number of successful catamarans, (including the first Little Americas Cup winner, ‘Hellcat’), Rod MacAlpine-Downie gave his business partner, Dick Gibbs, credit as the designer of the SHARK. Early boats were also built by Gibbs.
The first SHARK gained notice by winning the ‘Yachting’ One-of-a-kind regatta of 1963, held in Miami, FL (USA).
A unique feature of the SHARK catamaran is it’s ability to be folded down the middle, allowing it to be towed using a standard width trailer.

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

View on SailingTexas.com

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