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1991 Nacra 5.5SL 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.
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)
The NACARA 5.5 SLOOP uses the hulls of the NACRA 5.5 18 SQ. METER, with less beam and a sloop rig.
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