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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.
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.
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
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.
SA/D = SA ÷ (D ÷ 64)2/3
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.
Ballast / Displacement * 100
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.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
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.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
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.
CSV = Beam ÷ ³√(D / 64)
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