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PRICE REDUCED: $5,000 Ted Irwin designed two 30-foot models: The Citation and the Competition. Impromptu is a Citation and she has proven to be fast enough to win in competition. Offered in a fin or shoal keel with centerboard, Impromtu sports the centerboard which lowers quite deep for good windward performance. Her spacious interior is lavish for a boat her size. Moderately designed in a continental motif and handcrafted with teak throughout, she sleeps 5 in comfort ad style. Her layout is pretty traditional with a forward forepeak double cabin. The head lies just aft to port and it is completely enclosed for privacy. The main salon has port and starboard settee berths and a drop leaf table which folds against the main bulkhead when not needed. There is a teak floor throughout. The stylish wrap-around U-Shaped galley is on the starboard side. Across is the navigation table and just aft of it is a large quarter berth to finish off the sleeping arrangements. On deck there are two hatches, deck stepped mast and anchor locker forward. Wheel steering controls the inboard spade rudder. The boat has been sailed on Lake Superior since she was new. The current owner has had her for 5 years and now has moved up into a 38-footer. He remarks that this is a fun boat to sail and with the shoal draft, you can get into most anywhere. Impromptu is a good, solid vessel that needs some cosmetic work, but is ready to sail and is a very affordable way to get into a nice boat with cruising comfort and great sailing characteristics.
Equipment: 12 HP Yanmar Diesel w/35 gal fuel tank 2010 UK Mainsail w/Red Sail Cover 2017 UK 135% Furling Genoa 150% Furling Genoa (Original) Harken Roller Furling Unit Wheel Steering Whisker Pole Midship Mainsheet Traveler 2 Lewmar #8 Halyard Winches 2 Lewmar #25 2-spd Primary Winches Bow & Stern Rail w/Double Life Lines Transom Mount Swim Ladder Bimini KVH Azimuth Compass VHF Marine Radio Lowrance Chart Plotter DataMarine Wind Machine Windex Spar Fly 2 Fire Extinguishers Life Ring Life Sling MOB Pole 30A Shore Power Dual Battery 12v Electrical System 2 Burner Alcohol Stove 2 Fresh Water tanks totaling 85 gallons Hot Water Heater Dish Locker Galley Ice Box 4 Opening Ports 3 Deck Hatches Teak Handrails Marine Head w/Holding Tank Hanging Locker Deck Anchor Locker Anchor Rode & Chain Dock Lines & Boat Fenders
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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)
Shoal draft version std.
Opt. deep keel: 5.33’.
keel/cb BU:4.0’ BD: 8.08’.
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