Seller's Description
I have decided to sell my Hobie 18SX. The reason I am selling is due to a crack in the port hull near the rear cross bar that I do not have the fiberglass skills to fix. Other than the crack the boat is in excellent condition. I included some pictures of the boat along with a close up of the crack. Below is some more info on the boat and what comes with it. This boat is made up from parts from two boats I have owned. I will try and list the model year of the parts.•Hulls are 1981 that were professionally regel coated in 2009. I bought them in 2012. No soft spots anywhere. •I have kept the boat covered when parked the entire time I have owned it. •Mast: SX mast from a 1989 boat. 29.5’ long •SX style wing seats with seat tramps purchased in 2009 and are in excellent condition •Cross bars (Black Anodized) from 1989 boat •Boom (Black Anodized) 2009. •Sails o SX Square top mainsail (including battens) purchased 4 years ago from Whirlwind Sails in great condition o SX Pin head main (including battens) purchased from Whirlwind in 2007 in fair condition o Both mains made of mylar material used on the Hobie 20 sails o White SX Jib purchased from Whirlwind in 2015 good condition. Same material as the main o White SX jib purchased pre 2007 (Hobie sail) poor condition •Jib is roller furling •Rudders are EPO2 fiberglass models •Tiller connection has been upgraded to the H20 style for easy removal •Tiller extension is the longest Hot stick they make allowing the skipper to trap out off the wings. •Standard Hobie double trapeze lines •Main blocks – Harken 7:1. Lines in excellent condition •Jib Blocks – Harken 2:1. Lines in excellent condition •Downhaul blocks – 4:1. Line is in average condition •Tramp is black and was installed in 2009 and is in good condition •Comes with a fat bag storage bag that goes in the inspection port •Dagger boards are from 1981 and come with padded bags for storage •Rolco catamaran trailer from 1989 included o Includes coffin style cat box and auxiliary storage box on the tongue. o Replaced rollers with cradles in 2011 o Brake lights are sketchy o Includes spare tire Let me know if you would like more pictures or want a see it.
Specs
- Designer
- Hobie Alter
- Builder
- Hobie Cat
- Associations
- ?
- # Built
- ?
- Hull
- Catamaran
- Keel
- Twin Daggerboard
- Rudder
- ?
- Construction
- FG
Dimensions
- Length Overall
- 18′ 0″ / 5.5 m
- Waterline Length
- ?
- Beam
- 8′ 0″ / 2.4 m
- Draft
- 0′ 7″ / 0.2 m — 2′ 5″ / 0.8 m
- Displacement
- 400 lb / 181 kg
- Ballast
- ?
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 240′² / 22.3 m²
- Total Sail Area
- ?
Mainsail
- Sail Area
- ?
- P
- ?
- E
- ?
- Air Draft
- 27′ 11″ / 8.5 m
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
- Sail Area/Displacement
-
70.9
>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.
- 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
- ?
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
- ?
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
-
4.4
>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
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