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Classic & Clean, ‘Altair’ Hull #191 has been well-maintained with several 2021 updates and upgrades.
Altair is a classic, well-built, straightforward cruiser/racer with ample storage and simple, accessible systems. The T33 was designed by revered Sparkman & Stephens as a comfortable cruising boat with good sailing performance in deep and shallow water. Comfortable enough for four, the T33 is very easy to sail which makes it a great choice for a cruising couple.
Specifications LOA: 33’ 8” LWL: 28’ 10” Beam: 10’ 11” Keel: Scheel Keel Draft: 4’ 6” Ballast: 4,400 lbs. Displacement: 10,000 lbs. Mast above water: 51’
2021 Updates & Upgrades Reinforced stern pulpit Backstay adjuster, hardware, cables & 2 cars/rollers Buff and wax hull, deck, and cockpit Lifeline cushions Refurbished rudder Re-sealed cabin windows Re-sealed binnacle at base Re-sealed starboard handrail Re-bedded all starboard lifeline stanchions Replaced all belts & hoses Installed 2 new bilge pumps and 1 new sump pump LED lighting throughout Additional 110V outlet by navigation station 2 Group 27 Dual-purpose AGM batteries Prosport HD20 Marina 20-amp 2 bank battery charger Garmin GPSMAP Multifunction 9” Display w/ BlueChart G3 and LakeVu G3 Fusion MS-RA55 Marine AM/FM Stereo Bluetooth Receiver Galley sink faucet 360-degree foldable design Head sink faucet with retractable shower nozzle
Sails & Rigging Fractional rigging Aluminum mast & boom Spinnaker pole Preventer Kent main sail (excellent condition!): 7.38 oz Dacron, 5 full battens, 2 reefs, 5 Sailman Luff Cars, Lazy Jack System Kent genoa (excellent condition!): 150%, 5.18 oz Dacron, Sunbrella RF cover, foam luff tape, marked for reefs at 130% & 100%, Roller Furling headstay system by North/Harken Symmetrical spinnaker Winches: 2 #42 Chrome Lewmar self-tailing cockpit sheet winches 2 #30 Chrome Lewmar cabin top winches 1 #26 Chrome Lewmar self-tailing cabin top winch 1 #16 Chrome Lewmar cabin top winch Additional sails: racing main & foresail, storm jib
Equipment: Additional Equipment Custom 3-piece waterproof winter cover (refurbished 2021) Dodger (refurbished 2021) Bimini (refurbished 2021) 22 lb. Danforth anchor with 35 chain and 3/4-250 rode in anchor locker 12H lb. Danforth anchor with 3/8 X 150 rode in cockpit locker Stern pulpit anchor mounting bracket Bow anchor roller (store Danforth anchor with chain, etc. attached) Garhaver outboard engine hoist (new, not mounted) Leather stitched helm wheel cover Folding swim ladder
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)
Deep keel: 6.25’
Sheel keel was standard.
Earlier boats have a shorter fore-triangle with the following dimensions:
I: 36.50’ J: 12.5’ P: 41.75’ E: 14.50’.
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