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- Sailboat Guide
1986 Marine Concepts Sea Pearl 21 Trimaran
- Description
Seller's Description
1986 Marine Concepts Sea Pearl 21 sailboat, refitted at the factory in 1996, converted to full trimaran with wing decks and battened sails.
Cat ketch rig. 2 identical masts and sails.
Rigged by 1 person in 45 minutes, 30 minutes with 2 people. Nothing heavier than 40 lbs.
Great warm weather daysailer; fast, stable, tons of room. Ive sailed her with 6 people plus gear aboard.
Designed for easy single handed rigging and sailing.
The double outriggers (Amas) collapse inward for trailering (8.5 ft beam). When extended, the boat is almost 14 feet wide; making for level FAST sailing.
Painted 4 years ago and always stored on the dry, under cover. Sails, two biminis, and tent top included and in great condition.
Could use new lines at some point in the future. Currently in the process of replacing running rigging.
Road ready trailer is ready to go with new lights and greased hubs. Hasn’t been officially weighed on the trailer but should be roughly 2,500 lbs on the trailer. Most 6 cylinder cars can pull and launch it.
Search YouTube for “sea pearl trimaran” to see the features of these really cool camp cruisers.
I love this boat. Only reason for selling is because baby #3 is taking up more time than we thought.
Equipment: Road ready trailer
200 AH battery with SAE plug
1 small Bimini
1 large bimini
1 cabin/tent cover
1 16 watt solar panel
Rig and Sails
Auxilary power, accomodations, calculations.
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
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
Sail Area / Displacement Ratio
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
- SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D : Displacement in pounds.
Ballast / Displacement Ratio
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
Displacement / Length Ratio
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
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
Comfort Ratio
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 Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
Capsize Screening Formula
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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