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2010 Union River Presto 30 Sharpie

Listed

Seller's Description

Union River Presto 30 Sharpie Cat Ketch

Formerly named “Thorfinn”

This award winning Cat Ketch design by Rodger Martin was built by the Union River Boat Company in 2010. Extraordinarily innovative, this sailboat draws only 13” with centerboard, rudder and outboard retracted; making her one of the only truly “beachable” 30’ sailboats available. Her interior accommodations include sleeping for 4, and enclosed head and basic galley. Her 8’6” beam allows her to travel over the road on her custom trailer without the need for wide load permits. Her twin carbon, wishbone rigs have a low center of effort, making her extremely stable and fast.

Her masts and can be stepped on her trailer or in the water with the included gin-pole. 10’6” long cockpit comfortably seats 8 people.

Construction is incredible for her size:

Hull: Hull is built with vinylester resin, NCS (non-crimp structural) E-glass, and Corecell A500 core. Bow reinforced with aramid patches in case of accidental collisions. VARTM,also called vacuum infusion, is a closed-molding technique that increases the glass-to-resin ratio, ensures the laminate is consistent and free of voids, and produces a lighter, stronger part.

Deck: Hand-laid deck built with polyester resin, NCS E-glass, and vacuum-bagged Corecell A-500. High-density core is used in way of highly-loaded, through-bolted hardware, and epoxy (G-10) plates are laminated into the deck for tapped fittings.

Hull-to-deck joint: The modified shoebox hull-to-deck joint is bonded with Plexus (methacrylate structural adhesive) and through-bolted with -inch stainless-steel bolts.

Keel and rudder: Centerboard and rudder are vinylester/E-glass composite construction. The centerboard has 90 pounds of lead embedded in syntactic putty to add enough weight to keep the centerboard down while underway. The rudder gudgeons and rudder head are carbon-fiber/epoxy construction.

Rig: Two bilge-stepped, carbon-fiber, free-standing spars.

Equipment: Custom 2010 Dual Axle Launching Trailer, Disc Brakes Hall Spars Carbon Fiber Masts 2 Sets of Full-Batten Sails Mizzen Staysail Gin Pole for Mast Stepping Dodger Anchor and Tackle 8-Person Life Raft Bilge Pumps Boarding Ladder Galley with Stove and Sink Fully Enclosed Head with Composting Toilet Flexible Water Tanks Assorted Safety Equipment Kick-Up Rudder 9.9 Hp Honda in vertically lifting motor well 12V electrical system with running lights, cabin lights, etc.

Full surveys from 2018 and 2013 available.

Specs

Designers
?
Builders
?
Associations
?
# Built
?
Hull
Monohull
Keel
?
Rudder
?
Construction
?

Dimensions

Length Overall
29 11 / 9.1 m
Waterline Length
?
Beam
8 5 / 2.6 m
Draft
0 11 / 0.3 m
Displacement
?
Ballast
?

Rig and Sails

Type
?
Reported Sail Area
?
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
?

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

?
Classic formula: ?
Sail Area/Displacement
?

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: 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
?

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
?
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
?

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
?
<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
?

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: better suited for ocean passages
>2: better suited for coastal cruising

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

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