​The M or Marblehead Class, sometimes called the "50/800", is a medium size high performance development class. It's original concept in the 1930's was to produce the largest model that would conveniently fit in the standard American car of the time. The class is a development class with the main restrictions being a hull length of 50 inches and a sail area of 800 square inches. The class has been highly developed over the years to produce a high performance model that can be sailed in a wide range of conditions, assuming the owner has the appropriate rigs. Today's M weighs around ten pounds and carries an 85 inch rig in most conditions. The hull and rigs tend to use advanced materials and techniques. Boats are available from several suppliers who can provide them from basic kit form to fully assembled. There is also an active used boat market at the local level.

The M Class has a large base, with over four hundred competitive models in existence. It is sailed in most areas of the country. Competition is available from club level to national level, and even international level. As an international class with the same rule as the rest of the world (except the measurements for AMYA are in inches and pounds), AMYA members can attend regattas abroad. They can also take advantage of several excellent foreign suppliers.

When you are looking for a class to enter, look at the M Class. It has much to offer.

The Canterbury J originated in Christchurch, New Zealand, based on the J Class Ranger. A 48 inch Fiberglass hull and lead Keel both made from Class molds. Everything else can be made by the builder. Total weight of ready to sail boat is 14lbs 5oz.

The Columbia 42 is a semi-scale 12 meter model of the Sparkman and Steven's designed winner of the America's Cup. This boat was generally accepted as the best sailing of the 12's and also the best looking boat on the water.

The development mission for this new class was to "create a good-looking, good sailing boat that can be moved between home and pond fully-rigged, and can handle summer pond weeds that hang up most blade keel boats". The boat weighs just under 10 lbs and has a draft of 8 1/2".

The Columbia 42 is a new One Design addition to the AMYA fleet. It's design mission was to develop an attractive boat (1) that sails well, (2) can be transported to/from home fully-rigged, and (3) can sail in weed conditions most boats can't (thanks to its smooth underbody). The finished product is a semi-scale model of Columbia - the famous 12 meter that won the 1958 America's Cup with Briggs Cunningham at the helm. The keel on the model is 1 1/2" deeper than the original scale. A total of 13 developmental boats are grandfathered - 3 fiberglass and 10 with plastic deck inserts (rather than lighter birch plywood).

to Purchase a boat http://www.columbia42.com/

​The 914 millimeter long CR 914 is based on the original design of the International America's Cup Class. Because the CR 914 is relatively inexpensive and can be purchased fully built or can be assembled from a kit without special skills or tools, it qualifies as an entry-level class. A high performance racing machine that accelerates quickly, turns on a dime and points like a tour guide. It sails well in an extremely wide range of wind velocities, without having to use multiple rigs for light and heavy air like some other classes must do. Weighing only 6.25 pounds and carrying 658 square inches of sail area, it ghosts amazingly well in the lightest of air. Ballasted by over three pounds of lead in the streamlined bulb at the end of its deep fin keel, however, this remarkable little boat readily handles a 20 knot wind and can keep racing in gusts to 30 without shortening sail.

The hull and deck are cast as one piece of ABS plastic. The high-aspect-ratio foil-shaped rudder and keel fin are molded with their shafts installed. The spars are made of aluminum tubing, the keel bulb is a shaped lead casting, and the sails are dye-cut from lightweight rip-stop polyester spinnaker cloth. Kits come from the US distributor with complete electronics, a boat stand, epoxy and cyan acrylic glue, and an "upgrade package" that has been developed in the United Stares to overcome a few minor shortcomings in the original kit that were identified early in our experience with the boat. You get all the parts, reinforcing materials, fasteners and everything else you need to build and sail the CR 914 except sandpaper and batteries. Oh, yes, before you can go sailing you also need some water. Kits, partially built boats, finished boats ready to sail, and boats with custom paint jobs and special graphics can be ordered from the US distributor, Chesapeake Performance Models, which also carries a full line of parts and accessories.

The EC-12M is one of the one-design classes comprising the AMYA-recognized fleet. Class specifications govern virtually every aspect of these yachts from hull and sail design to permitted remote controlled functions. Approximately 5 feet long, with a mast standing about six feet over the deck, the EC-12M weighs in at about twenty-three pounds.

Originally a towing tank model for a Charley Morgan twelve meter, the EC-12M can be transported in all but the smallest of cars, sailed in shallow waters, and in winds from mere zephyrs to light gales. The hull is shaped so as to shed dead leaves and other flotsam, an important feature when sailing on inland lakes and ponds.