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Seller's Description

Nacra 5.5SL 1991 Sails: Sq top Main 2018 (EP) Radial cut with harken clew traveler, fiberglass battens. Jib good shape – class legal EP, no tears, damage, or repairs Jib system: 4-way jib adjustment (standard on 5.5SL) 8:1 main sheet, 8:1 downhaul, 2:1 rudder pull down Beams, mast, hard parts (like bridle foil) all good. Dolphin striker rod & hardware replaced (Murrays) Trampoline replaced SLO sail (with added zipper pouch) Standing rigging (stays), Trapeze wires, & diamond wires replaced New roller furling rig kit (Murrays) Rudders & daggers: have some glass in repaired area. But solid with no chunks missing or split areas. Comes with dagger board bag and rudder covers. Rudders modified & glassed – tuck under boat further (needed for sq top as uni - to balance tiller feel) Rudder/tiller tie bar kit (for anti-rotation) (Murrays) Hulls are solid. One professional repair area – can tell from slight gel coat color match. Hull decks are perfect with no damage or cosmetic issues Access ports replaced (Murrays) Various harken cam cleats replaced (Harken, Murrays) Can’t miss trapeze handles added (Murrays) EVA foam added for comfort/safety (Murrays) Standard mast rotator and over-rotator Older bag launch spinnaker (I have never used came with boat) Cat Trax and trailer included – both good condition Cosmetic items: some glass repair areas on daggers. And a few stress cracks in the hulls. These stress cracks are in the gel coat only. And are in top of hulls towards the front. My guess is they were caused by the old school “Big” spinnaker that previous owner ran. On the front beam I had a self tacking jib rail and it is removed. However, I left the jib track mounts on the beam. Spinnaker is red/yellow/orange and is 26’luff, 22’leach, 16’foot. Boat was kept in Dallas area before I purchased and re-conditioned it. The Nacra dealer who sold the boat new is La Vida Starships (Lewisville, TX). They sold it new, and also sold it to me. Titled and registered in Texas. Some Note: Some pix show NACRA decal on the hull. I added then recently removed it for a cleaner more classic look. “Wildthing” decal on inside of hulls will be removed. I kept the original sail number (#189) for the new sq top by Skip at EP.

Specs

Designer
Tom Roland
Builder
NACRA Catamarans
Associations
?
# Built
?
Hull
Catamaran
Keel
Twin Daggerboard
Rudder
?
Construction
FG

Dimensions

Length Overall
18 0 / 5.5 m
Waterline Length
?
Beam
8 5 / 2.6 m
Draft
0 5 / 0.1 m 2 9 / 0.9 m
Displacement
370 lb / 170 kg
Ballast
?

Rig and Sails

Type
Sloop
Reported Sail Area
241′² / 22.4 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
74.2
>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.
74.18
<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
4.7
>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
4.71
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

The NACARA 5.5 SLOOP uses the hulls of the NACRA 5.5 18 SQ. METER, with less beam and a sloop rig.

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

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