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Selkie 1978 Tartan 30 Purchased new at Hartge Yacht Harbor Only two owners since new
Equipment: Boat details:
Sails: Main with Dutchman 155 Genoa 100 Jib Asymmetrical Spinnaker with Sock
Engine: Atomic 4 Electronic ignition 2017 New alternator Upgraded water pump 2018 New Cutlass bearing
Electronics: 2020 New gauges ($1,000) 2015 Raymarine depth Datamarine Speed Datamarine Wind 2018 new compass 2 - 100 Amp AGM Batteries 2016
Canvas and Rigging: 2017 New Bimini/dodger 2017 New sail cover Canvas shade extensions for cockpit Tiller Starboard Lazarettes 2 Upgraded mainsheet Lewmar self-tailing winches 2 Danforth anchors 85ft Anchor chain with 100ft rode Chrome dorads 2 Midship Cleats Spinnaker Pole 2017 all new cockpit cushions with Phifertex
Cabin/Head 2011 All upgraded cushions and new upholstery Upgraded cabin headliner New Jabsco head 2019 Almost all LED interior lighting Upgraded larger sink 2018 new galley brass through hull
Other: Complete set of boat and equipment manuals Some spare parts (spark plugs, impeller, tiller handle, etc.) 2019 Hull bottom painted June 1, 2020 Hull and prop cleaned by diver
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)
S&S (#2016)
One of Tartans most successful models. Two hull and two interior configurations were available. The standard rig includes a fin keel with skeg hung rudder with draft as shown here.
The tall rig has an extra 3 feet of mast, 5.5’ of draft and an extra 500 pounds of lead.(Sometimes referred to as TARTAN 30C.)
The interiors came in a center galley and aft galley version. Standard power was the Atomic 4 while some came with a Faryman Diesel.
Thanks to ‘callmecrazy’ for supplying additional layout details.
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