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builders of the
Sea Pearl 21 and
Sea Pearl 21 Trimaran

Important Features of the Sea Pearl 21 Monohull and Trimaran

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General specifications

Mast system

Hull design and construction


Convertible cabin


Water ballast


More information



  • LOA: 21'-0"
  • LWL: 19'-0"
  • Beam: 5'- 6"
  • Draft (board up): 6"
  • Draft (board down): 2'-6"
  • Trailering weight: 600 lbs. (approx.) monohull
  • Trailering weight: 1000-1500 lbs. (approx.) trimaran
  • Sail area (standard rig): 136 Sq. Ft.
  • Sail area (vertical battens): 180 Sq.Ft.
  • Aft cockpit length: 6' - 6"
  • Center cockpit length: 10' - 0"
  • Mast height above waterline: 19' - 6"
  • Headroom under convertible cabin top: 3' - 6"

Outstanding Features of the Sea Pearl 21:

The unstayed cat-ketch rig is a pleasure to sail and offers many advantages over a sloop rig in terms of convenience, safety, and even in performance. Although it is not considered a racing boat, it does perform extremely well. It points well and tacking is no problem.

This rig will allow you to "heave to" by merely sheeting in the mizzen and releasing the main. This puts her into irons and keeps her bow pointing toward the wind unattended, yet you can easily sail off by simply backing the main, which is right at your fingertips.

This feature is invaluable when it comes time to reef, fix a sandwich, get a cold drink, wet a fishing line or just take a break. This boat will take care of itself and you!

Wing on wing beats fooling around with a spinnaker, and presents 100% of your total sail area to unspoiled wind. No poles to position or jibs flapping uselessly.

When wing on wing, the unstayed rig allows the booms to be sheeted out beyond 90 degrees to the centerline of the boat, which gives you more than 180 degrees of steering latitude before an accidental jibe. (An accidental jibe is perhaps the most dangerous possibility when running before the wind.)


Our unique mast/sail system makes setup and sailing simple. First, because the Sea Pearl uses two masts, it can achieve good sail area with a low-aspect sailplan that is also more flexible. Unlike most day sailors where the masts overhang the bow and stern by a considerable amount when being trailered, the Sea Pearl masts fit precisely inside the boat, stowed on deck.

The masts are in two parts each, though they are rarely disassembled. This not only provides some taper to them but permits you to break them down for long-range travel and stow them entirely below the forward cockpit and out of the way. Most owners never do this, preferring to leave masts and sails in the on-deck position while trailering and ready to use quickly. But we give you the added option.

The heart of our mast system is our special rotating gooseneck (the fitting that attaches the boom to the mast). This—and the fact that the masts are freestanding with no stays and shrouds—permits you to rotate the masts 360 degrees while they are upright and in place.

To reef, you simply rotate the masts, rolling the sails up like vertical windowshades. This takes only seconds.

This Sea Pearl has the same larger vertical-battened sails as seen in the two boats pictured above, but the sails are rolled up tight around the masts. (Yes, they're really on there!)

The sail is sleeved and slides down over the mast. There are no halyards and the sail is normally stowed wrapped tightly around the rotating mast. (See photo, above, where these vertical-batten sails are left permanently on the masts, secured by small black velcro strips.)

Sails are loose-footed and come in two styles and a variety of colors. Standard sails total 136 square feet. Optional vertical batten sails total 180 square feet and the vertical batten design permits them to be rolled around the masts just as the standard sails are. Standard color is white but you may opt for tanbark or other color.

Our hull design and our construction methods are top-quality. The design dates back to 1929 when famed naval architect L. Francis Herreshoff designed the 18-foot, single-mast Carpenter to be a sturdy and simple tender for a larger boat. We at Marine Concepts liked the design and the concept of simplicity but made some changes to create a very special day sailor.

For starters, we extended the length by three feet and added a second mast. Today's Sea Pearl is much along the lines of a long whaleboat, with flat bottom for beaching, six-inch all-around coaming to cut down on spray (and keep dropped items from going overboard), and two large cockpits.

The hull is heavily built of hand-laid-up glass cloth over a Corecell foam flooring. There is no balsa wood to rot should a break in the hull let in some water before it is repaired. There is a full deck/liner for a good finished look (and to use to attach some fittings to). The hull/deck joint is covered with a sturdy metal rub rail (standard) or optional wood rail for that classic look. There are wooden fiddleboards for storage to either side of the forward cockpit and added storage under forward and rear decks and under the floorboards that span the bilge.


The boat is half-decked with two cockpits, one between the masts and one aft for the skipper. Water ballast tanks are built-in. Masts step onto the keel through pipes from the deck above and are free-standing. Standard with two aft cleats and one larger bow cleat. Hull/deck options include bow anchor package and fittings, added side cleats, rowlock points and rowing seat, and much more. See our parts and accessories page for more details and more options.

The leeboards are trouble-free and open to inspection, unlike centerboards. They drastically improve the windward performance and help balance the helm to allow the Sea Pearl to self steer to windward. There is no obtrusive centerboard trunk inside the boat. This gives you more usable space and a large flat surface to walk, sit, or sleep on. You can even sit in lawn chairs if you wish.

Leeboards are common in the Netherlands and other areas where shoal water makes keels and even centerboards either useless or too vulnerable to damage. The Sea Pearl's leeboards are fiberglass, airfoil-shaped, and have a large lead "shoe" on the bottom to add weight down low and to absorb impacts with rocks or sandy bottoms. They weigh about 35 pounds apiece and each is hauled up by a pennant/cam cleat arrangement.

You may sail with both boards down all the time, though the boat will pick up some speed if you use only the downwind board. (The "lee" board—thus the name.

No centerboard slot and trunk in the hull means no leaks around the trunk base or spray out of the top of the trunk, and no drag when running downwind with the boards up. The forward cockpit remains totally open ad uncluttered for sleeping under the convertible cabin.

The leeboards are attached to the boat with sturdy through-the-coaming bolts. Our unique universal-joint fitting permits a leeboard to "wing-out" away from the boat to relieve excess sideways stress. You can actually lift the board yourself and hold it away from the boat at a 90-degree angle. This eliminates the need for a leeboard trunk to protect the board—while keeping the entire board visible for inspection.

Sail in less than one foot of water, and sail right up onto the beach with no harm done. Some owners "park" their beached boats by dropping both leeboards to hold the boat in place.

The Convertible Cabin is a real convenience feature. In two minutes it transforms a roomy day sailor into a great overnighter. With a few items of camping gear you suddenly have a cruising sailboat. You carry this cabin folded forward on the front of the forward cockpit, ready for instant deployment, or tucked away below.

It can be used for privacy with a portable toilet, or a place to get out of the weather.

Doors at either end of the tent have bug screens and weather flaps which, when open with the screens in place, give you more bug proof ventilation than any fixed cabins. Large windows on each side let in light. Drop the optional rowing seat into place to have a secure table.

Since the boat can be sailed with the cabin up, you can use the cabin to keep out rain during a storm. (If you do not opt for the convertable cabin, the standard tonneau cover can also keep out rain, even while underway.) Imagine sleeping in a tent that is anchored away from buggy camp areas, aims itself into the wind so you always have a breeze if you wish it, and that rocks you gently to sleep!


Beach the boat without concern. These boats are intended for running onto sandy beaches. The bottoms are sturdy and flat. Leeboards and rudder may be left down all the way in (they will kick up on their own).

Once on the beach, raise the rudder, drop the leeboards to lock the boat in place, furl the sails if the wind so dictates, put out the bow—and sometimes a small stern—anchor. And eat lunch.

Our water-ballast system gives you security with flexibility. The Sea Pearl has two water-ballast tanks running the length of the forward cockpit, one either side. Not only are these provided for added stability but the tanks, in conjunction with the floorboards that span the space between them, give you a good-sized bilge area to use for storage and also a flat floor to walk, stand or sit on.

To use the ballast tanks, simply open the access ports on the tops of the tanks, reach inside and open the bronze through-hull plugs. Wait a few minutes until the tanks are full, screw in the plugs and replace the access port covers.

You have just added about 350 pounds* of ballast, effectively increasing the boat's weight by fifty percent. This will make for a smoother ride in a choppy sea.

*varies slightly with fresh versus salt water and how saline the salt water is.

To empty the tanks you may pump them dry with a hand-operated bilge pump or do as most owners do, and wait until the boat is up on its trailer and then open the through-hull fittings. The boat can be loaded onto the trailer with the water ballast in place.

Our approach to trailering makes use of all of these features to make this part of your sailing experience as painless as possible. The rig is simple, quick and easy for one person to raise.

Set-up takes about ten minutes (as compared to as much as 45 minutes for boats with stays and shrouds to rig). It is quite possible to launch the boat with the masts still stowed on deck, and put them up after pulling away from the boat ramp.

In normal use, everything except the masts stows below under the standard tonneau cover, while the masts fit within the length of the boat. For long-distance traveling, you may remove the sails, break down the masts, and stow those below as well.

The fact that there is no cabin lowers the overall height and greatly improves towing visibility. No fixed cabin and no deck sweeping jib greatly improves visibility when sailing as well. The tilt trailer with strategically placed rollers makes for easy launching from the beach or a ramp.


More Information:

Read our TESTIMONIALS from Sea Pearl owners


See more PHOTOS

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