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T37 RC An Official American Model Yachting Association Racing Class

T37 RC Class Rules

The object of having limits on the one-design T37 class is to make all of the boats evenly matched for exciting sailing competition. In one design racing it is the skill of the sailor that should be the only factor that materially influences the outcome of the races. Another objective of the limits is to keep the boats from being altered in such a way as to make them less seaworthy, less strong or less durable. It is also part of the object of the limits to keep the boats affordable for everyone. Any modifications that involve significant changes to the boat or involve significant cost are therefore not allowed. Any changes that affect the weight or shape of the boats are not allowable. Any changes that would make a standard boat less competitive are generally not allowed.

HULL - The hull must be constructed according to the instructions provided with the T37 Kit and from the materials provided with the kit. The hull is considered to consist of the deck, the two sides, the bottom, the transom and the keel. The thickness of the hull and deck panels cannot be changed. The rounding of the chine cannot extend upwards or across the bottom more than 1/4 inch.

SAILS - The sails must be the standard sails provided by Tippecanoe Boats. Any changes to the sails are not allowable. Reefing the sails is not allowable. The boats may be sailed with just the headsail if so desired. The headsail can be mounted on a separate mast. Battens and telltales may be added to the mainsail and the jib.

BALLAST / KEEL FIN - The ballast casting must be used as supplied by Tippecanoe Boats without any changes in size, material or weight. The keel fin must retain its profile as supplied by Tippecanoe Boats. The keel fin must have a minimum thickness of .220 inch for 1/4 of its chord length from front edge to back edge at every point from top to bottom. The keel must be fixed and not movable.

RUDDER - The rudder must have a minimum thickness of 1/8 inch at some point in its fore and aft chord all of the way from the top edge of the rudder to the bottom edge. The rudder depth must be the same as the standard rudder depth of the rudder supplied with the T37 kit. Otherwise the rudder can be shaped as the builder pleases. The rudder shaft can be made from any material, as long as it is at least 3/32 inch in diameter. Since the rudders are easily replaced, there are fewer restrictions on altering the rudders. Rudders cannot be switched between races. There can only be one rudder on a boat.

MAST / BOOMS - The mast material can be wood or carbon fiber. The mast can only be supported with two shrouds, a backstay and a forestay. Spreaders can be added to the rig. The mast must be fixed and not movable. The mast cannot be tapered and must not be less than ¼ inch in diameter. Minor changes that can be made to any boat easily after it has been completed will generally be acceptable, but must first be approved. A boom vang may be added on the mainsail. The boom vang can be manually adjustable but cannot employ any sort of motor. The forestay can be attached directly to the bow deck or to the jib boom, in which case the jib boom may be attached to the deck at any point along the forward third of the jib boom. The standard servo can be switched to a higher torque servo to control the sails, but the sail control servo must still be mounted on the top surface of the rc control platform and must not stick up higher than the top surface of the deck. The rc control platform must be positioned as shown in the assembly instructions and cannot be set lower in the hull to accommodate a larger servo or to get the weight of the servos and batteries lower. The batteries must sit on the top surface of the rc control platform. A sail winch is not allowable. The sail control arm mounted on the sail control servo must not be any longer than the sail control arm provided by Tippecanoe Boats. A double throw pulley system can be incorporated into the sheeting system to increase the range of motion on the mainsail and the jib.

RIGGING - Shrouds and backstay may be of any material. The forestay must be nylon tubing as supplied with the T37. The shrouds and backstay must be rigged in such a way that they can be easily detached and re-attached for ease of taking down the mast for transportation. The shrouds and backstay can be designed so that they can be adjusted by hand.

WEIGHT - The minimum allowable total sailing weight for the T37 with batteries on board is 5 pounds.

Any changes other than the allowable changes mentioned above can be considered not to be allowable unless approved by the T37 AMYA Class Members and Tippecanoe Boats.

Address all questions to T37 Class Secretary Will Lesh, 1-800-206-0006 or fun@modelsailboat.com or by mail at 4305 Nordum Rd. Everson, WA 98247.

These class rules are subject to changes as the need arises, although the changes will not affect the basic purposes of the class rules as stated in the opening paragraph.

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