Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.
MAIA a 1990 Seaward 23 shoal drafted winged keel sailboat is for sale. She is day sailing or cruiser ready. For the past 12 years, MAIA has sailed fresh water only. The last 6 years she sailed in Angostura Lake in the southern Black Hills of SD. Each year, off season, she was stored in a barn until springtime. We have retired from sailing, so it is time for MAIA to move on to a new owner.
Equipment: Honda 9.9HP 4 stroke long shaft engine Edison wheel steering pedestal with Richie compass Break away rudder 17 lb delta winged anchor Stainless steel lifelines CDI Roller Furler 135 Genoa with sail bag Main sail with battens and sail bag Lazy Jacks Boom tent and sail cover Asymmetrical spinnaker, dousing sock and sail bag Folding cockpit table Hummingbird Piranha Depth/Fish Finder Standard Horizon Marine Radio Kenwood Bluetooth/CD Radio Interstate Marine batteries Ameriteak flooring in cabin and cockpit All interior cushions in excellent condition
Performance dual axle trailer Spare brand-new rudder
Additional pictures available upon request
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)
Also offered with an unstayed cat rig.
Yanmar inboard offered as an option.
This listing is presented by SailboatListings.com. Visit their website for more information or to contact the seller.
Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.
©2025 Sea Time Tech, LLC
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.