General Rules

All magnets must be “HOPRA Approved” and made from ceramic or polymer magnet material only.
No freak or irregular magnets shall be allowed. Ceramic magnets must be within 5% of the standard set submitted. Magnets must be under a set Gauss limit. See car classes for more information.
The number of armature magnets used per car cannot exceed the stock number and cannot be more than two. Each magnet cannot exceed more than .0233^3 and must be a minimum of .0175in^3 of total volume.
The number of extra magnets used per car cannot exceed the stock number and cannot be more than two. Each magnet cannot exceed .0141in^3 and must be minimum of .0125in^3 of total volume.
The number of flux collectors used per car cannot be more than stock.
Any car, which contains more than two magnets, shall not be allowed any flux collectors.
The chassis entered must be HOPRA Approved, with magnets being part of the chassis and cannot be substituted. Bulkheads, chassis clip(s), endbell, magnet retaining clip(s), and timing brackets are part of the car and can be replaced after qualifying. The body cannot be substituted except for same color conflicts and at the tech inspector’s discretion and approval.
All cars/chassis must be readily available and HOPRA approved. See individual class rules for legal chassis.
All new cars, chassis and magnet sets must be submitted no later than October 15th to be considered for approval for the following year’s National Championship Race. (See appendix for more details).
Magnets submitted for “HOPRA Approval” are to be considered the “standard” set regarding all technical inspection questions. Meters throughout the organization wi l be calibrated using these standard magnets provided. These standard sets are to be identical to what is readily available.
Chassis/Cars submitted for “HOPRA Approval” are to be considered the “Standard” regarding all technical inspection questions. Changes to the original “Standard” design spec chassis shall be resubmitted for “HOPRA Approval” and will be considered a new chassis or car. All chassis must be molded and no after production machining is allowed except for where allowed per class rules.
No broken chassis will be allowed to enter the race except for body mounts and/or pick up shoe bumper guards. Guide pin bumper must not be broken.
A non-adhesive, non-magnetic, separate, and easily removable material can be used to restrict the movement of magnets in the chassis except for where not allowed per class rules.
The minimum allowable wheelbase is 1 ¼ (1.250) inches.
The maximum allowable width of the car is 1 5/16 (1.3125) inches.
The maximum allowable length of the entire car is three (3.00) inches.
Only one guide pin per car shall be allowed.
The maximum allowable lateral movement of the front axle is 1/32 (.03125) inch and may not exceed general rule 15 when extended to the furthest point.
During the race, any individual part of the car may be replaced. The chassis and body are not considered individual parts. The Race Director or Technical Inspector has the right to inspect any car after repairs have been made. If repairs are necessary, they shall be made before the car may re-enter the race. The repairs may be made during lane change periods or on the driver’s race time. The race shall not be stopped for repairs unless the Race Director has declared a track ca l specifically to allow for repairs.
The body must be painted, and rear wings/spoilers may be added for aesthetics only. Overall height of the car and mounted body cannot exceed 3/4″ (.750″). This height will be measured with the body mounted on the car as it sits on the track.
The body must cover the chassis, tires and wheels when viewing the car from above except through legal openings (i.e., windows, etc.). No body cutting except for wheel openings. Open wheel bodies are only allowed in Stock Class. This rule does not apply to the Vintage T-Jet car class as it is subject to its specific body regulations.
Any car without a body or with an interfering body wi l not be allowed to continue to run.
Cars must be equipped with four tires, which touch and roll when checked on a test track with no or low rails.
The driver has the final responsibility to prove the legality of their car.
Every car entered may be required to submit to a post-race technical inspection. Failure to comply will result in immediate disqualification of the car and entrant and forfeiture of entry fees paid for that entry.
If necessary, a vote by the National Executive Committee members present shall determine the final interpretation and enforcement of all rules. If it does not appear in this rulebook, it is not legal for HOPRA competition.
All items to be added to the agenda for the open meeting must be submitted in writing or email to the National Director no later than June 1st. Any additions after that time must be approved by at least three (3) members of the National Executive Committee.
The use of lights on cars in National Championship competition is not allowed.