2020 Tri Hull Rules

TRIHULL CLASS TECHNICAL SPECIFICATIONS

Boat Standards

  1. Driver Restraint System

A. All Trihull boats must be equipped with a driver restraint system consisting of a minimum 5-point mounting design. The restraint system shall consist of not less than two lap, two shoulder, and one or two crotch straps, hooked together in a central release system. This release mechanism must remain released/open once it is activated and until it is reset.

B. All belts shall be at least 2″ wide, entirely constructed of polyester material, SFI 16.1 certified; and either replaced or recertified within three years after the date of manufacture indicated on the SFI tag. The conformance label is a “punch out” patch. One patch shall be sewn onto the left strap of the lap belt assembly, one onto the left strap of the shoulder harness assembly and one onto the anti-submarine strap. The patch shall have the month and year of manufacture punched out and easily identified. Belt systems must be mounted following manufacturer’s recommendations.

  1. Roll Cage

A. All Trihull boats must have reinforced roll cage The roll cage must be constructed so as to protect the driver from frontal, side, rear, and top impact.

B. The entire roll cage is required to be constructed of either mild steel 1 5/8″ round tubing with minimum 0.118 wall thickness or 4130 chromoly 1 5/8″ round tubing with minimum 0.083 wall thickness. The only exception to this will be the bottom seat mounting brackets, which are 2″ x 2″ angle iron.

C. All joints must be welded.

D. Roll cage must be welded by a certified welder.

E. The roll cage must be mounted to the floor or bottom of the boat and attached in such a manner to prevent it from being dislodged in case of an impact.

F. All roll cages must be “U” bolted to a structural brace. The structural brace will be required from one side to the other behind the driver’s seat inside the boat. Its purpose is to provide support for the gunnels and the driver’s cockpit in the event of a side collision.

G. Roll cage must have no evidence of rust, corrosion, or damage of any kind. Tubing ends must be capped and there shall be no holes of any kind so as to prevent water from becoming trapped in the roll cage. Referee may deem any roll cage unfit for use at his/her discretion.

H. See following page for acceptable roll cage dimensions.

  1. Steering

A. Steering will be either rack and pinion or rotary cable. No power steering or electric assist will be permitted. The steering must be in the original dash location front to rear.

B. Boats must remain intact. Any material on the inside of the gunnels may be removed, with the exception of dash and splash well. The bottom of the boat may be reworked.

  1. Weight

A. Combined boat, driver, and equipment weight must be a minimum of 1700lbs following heats.

  1. Motor Standards

A. Engine(s) must not exceed a total of 100 cubic inches in displacement as originally manufactured. A tolerance of 3ci will be allowed for overbore.

B. Gear cases may be modified; however, low water pickups are not allowed, and the original location of the water pickup must be maintained. Gearcases must have a skeg and be shiftable from the driver’s seat.

C. All engine exhaust must travel into the downhousing; no open exhaust stacks are allowed.

D. Flywheels may not be modified in any way.

  1. Claiming Rule

A. A $3000 “Claiming Rule” is enforced for all officially entered engines. This claiming rule includes the engine, trim system, mounting bracket (jack plate) and propeller exactly as raced. This claim must be made in cash. Claims may be made between the final heat and the awards ceremony, or one hour after the final heat, whichever comes first.

B. Only drivers who have competed for a full calendar year and participated in the event on the day of the final shall be allowed to claim an engine.

C. Any one driver’s engine can only be claimed twice in a racing season.

D. Any driver can claim only one motor in a racing season.

E. In the event that a driver’s engine is claimed and he/she does not surrender it, then that driver is disqualified from that event and is suspended from all tri-hull racing for one calendar year.

 

 

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