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Seller's Description

1979 Nacra 5.5 SL (sloop) also comes with Uni-rig (main only) stays and bridle. Older, modified boat, but ready to sail! Started life as an 18sq, converted to a 5.5 Uni, then hull-to-hull spreader, bridle and jib added to make it a sloop. I put a lot of love into this boat as my first cat. Built it up from a damaged project boat about 6 years ago. So hoping someone will love it and sail it. Please don’t buy this to part out … but at the same time I do need to move this. It’s also not a total beginner boat. This boat is in Northern California - happy to bring it to a serious nearby buyer and spend time rigging the boat or even sailing with them if they needed guidance. These Nacras were quick and popular for their day and share similarities and parts with Nacra 5.2, 5.8 and 6.0. Not a real competitive boat, but I’ve raced at a lot of regattas in the open multihull class and had fun. It’s an older boat for sure with thin glass layup - so it needs to be treated gently. This is not a drag it up the beach Hobie 16. Ideally you would have or source some beach wheels. It can be moved/carried by two people bare - but fully rigged, wheels are ideal. The hulls are in decent shape - no leaks, no deep gouges - tho it’s an older boat and gel coat has lost some shine. Hulls have had repairs over the years (not by me) including adding glassed-in width-wise supports in hulls to stiffen the boat. There’s a lot of inspection ports - ten!!! So access is easy almost everywhere on hulls. Mainsail is in very good shape, two jibs w/ one in decent (off a Nacra 5.8,), mast and spreaders in great shape, standing rigging is fine. Comes with the Uni-rig stays (twin forestays, no bridle) if you want to run it Uni (mainsail only) by removing bow spreader and bridle. Tramp is old but has been re-sewn and has some life left. Blocks and sheets all good shape. Rudders and dagger boards in good shape. Comes with spare set of rudder blades and a spare set of daggerboards. Trailer is custom made by me. Nice lengthy carpeted hull supports, mast supports with rear one drop-down out of way if you pull a pin. All lights work. Trailer and boat are both registered with papers.

Specs

Designers
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Builders
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Associations
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# Built
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Hull
Catamaran
Keel
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Rudder
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Construction
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Dimensions

Length Overall
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Waterline Length
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Beam
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Draft
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Displacement
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Ballast
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Rig and Sails

Type
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Reported Sail Area
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Total Sail Area
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Mainsail
Sail Area
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P
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E
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Air Draft
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Foresail
Sail Area
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I
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J
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Forestay Length
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Auxilary Power

Make
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Model
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HP
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Fuel Type
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Fuel Capacity
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Engine Hours
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Accomodations

Water Capacity
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Holding Tank Capacity
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Headroom
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Cabins
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Calculations

Hull Speed
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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

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Classic formula: ?
Sail Area/Displacement
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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.
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<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
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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

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<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
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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
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<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
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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
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<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
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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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<2: better suited for ocean passages
>2: better suited for coastal cruising

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

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