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Seller's Description

Fast stable and durable Jim Brown designed trimaran. Former dealer demo boat in excellent condition with all the options. Carbon Fiber bowsprit and turbo reacher/drifter kit, motor mount (2hp is lots), fully battened main and roller furling jib with custom jib sock (jib lives on the boat when mast is up), rotating aluminum wing mast. Custom Shorelander trailer in like new condition. All up weight is 400lb and is easily towed by a regular car and setup by one person. Boat was used at Boat shows and only sailed lightly. Kept this boat when Windrider dropped their dealer channel and moved it to the cottage but it’s only been sailed about a half dozen times in the past 6 years (too many toys) so time to let someone else enjoy it. You won’t find one in better condition and includes all my dealer spare parts. Older colored boats tended to fade, the white you just have to clean periodically. The Windrider 17 is a great learn to sail boat, provides a good turn of speed in this configuration for the experienced sailor and has lots of enthusiasts worldwide. Cockpit room for 2 and trampolines for a couple more. Pedal Steering and all control lines lead to aft cockpit. Lots of Youtube Videos of Windrider adventures. Can deliver and/or facilitate.

Specs

Designer
Jim Brown/Windrider
Builder
Windrider Sailing Trimarans
Associations
?
# Built
?
Hull
Trimaran
Keel
?
Rudder
?
Construction
Roto molded Poly.

Dimensions

Length Overall
16 11 / 5.2 m
Waterline Length
?
Beam
?
Draft
1 6 / 0.5 m
Displacement
400 lb / 181 kg
Ballast
?

Rig and Sails

Type
Cat
Reported Sail Area
96′² / 8.9 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
?

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
28.3
>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.
28.34
<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
7.0
>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
7.02
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Beam on trailer: 8.5’
Trimaran w/fixed keel.

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