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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.
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)
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