Specs & Rules

Seattle’s Magnuson Park is the home of the Seattle RC Racers’ carpet racing program. All of our race classes feature electric onroad cars.

LiPo battery voltage: 1s maximum voltage: 4.200v. 2s maximum voltage: 8.400v. Cars that fail prerace tech will be disqualified for that round. This is a zero tolerance policy. The club’s voltmeter will be the reference of last resort.

Traction compounds: SXT 3.0 in original bottle. Tires may be cleaned with the allowed traction compounds, Simple Green, motor spray, or water. There are no traction compound restrictions at Seatac R/C Raceway.

Tech for all classes: A self-tech area will be provided for all racers. Here we ask you to check weight, ride height, and battery voltage. Spot checks by the race director or Competition Committee may be performed at any time to ensure conformity with the club’s specs and rules. Failed tech will result in voiding the driver’s results for that race and the rounds preceding it that night.

Tables, Chairs and Table Protection: In the Community Center gym (Saturday races) the Seattle Parks Department, and ultimately Seattle’s tax payers provide the club tables and chairs for our nightly use. We will take care of them. Pit towels or mats are mandatory for all racers. In H30 (Wednesday races), drivers provide their own table and chair.

Stock Touring: 1/10th scale 4wd touring chassis. 1350g minimum weight. 5mm minimum ride height. ROAR-approved 17.5t brushless motors*. ROAR-approved Non-Timing ESC. Team Powers 30 pre-mount spec tire. ROAR-approved touring car bodies. Maximum 6-cell NiMH or NiCd batteries or maximum 7.4v 2S lithium technology batteries. Batteries must be on ROAR-approved list.

Modified Touring: 1/10th scale 4wd touring chassis. 1350g minimum weight. 5mm minimum ride height. Any 540-size motor brushless motor. Big race spec tires: Team Powers 30 pre-mount spec tire. ROAR-approved touring car bodies. Maximum 6-cell NiMH or NiCd batteries or maximum 7.4v 2s lithium technology batteries. Batteries must be on ROAR-approved list. This class for advanced onroad racers only.

Stock 1/12th: 1/12th scale pan car chassis. 730g minimum weight. 3mm minimum ride height. ROAR-approved 17.5t brushless motors*. ROAR-approved Non-Timing ESC. Purple stripe spec tires. GTP and LMP style bodies only. Maximum 3.7v 1s lithium technology batteries. Batteries must be on ROAR-approved list.

Modified 1/12th: 1/12th scale pan car chassis. 730g minimum weight. 3mm minimum ride height. Any 540-size brushless motor. Blinky ESC. GTP and LMP style bodies only. Maximum 3.7v 1s lithium technology batteries. Batteries must be on ROAR-approved list.

Scale Spec: 1/10th scale electric chassis. 5mm minimum ride height. Motors for Magnuson Park: Tamiya 540 silver can motor; Novak SS Pro 25.5t (PN: 3425V), Ballistic 25.5t (PN: 3625V), and Ballistic Boss VTA Edition (PN: 3626V) brushless motors; any ROAR-approved 25.5t motor. 12.3mm rotors only. No restriction on endbell timing. Motors for Seatac R/C Raceway: Tamiya 540 silver can motor; any ROAR-approved 21.5t brushless motor. ROAR-approved Non-Timing ESC for brushless motors. HPI D Compound or Gravity RC USGT pre-mount tires. Realistic, scale bodies must be run on all chassis. VTA bodies may run included rear-deck spoilers. GT bodies may run included wings, or option wing sets that emphasize scale appearance. Maximum 6-cell NiMH or NiCd batteries or maximum 7.4v 2S lithium technology batteries. Lithium technology batteries must be in hard case. 4wd: 1450g minimum weight. FWD: No minimum weight. M-Chassis: No minimum weight. Open tire on Mini rims. The spirit of Scale Spec is reasonable cost, scale-appearance, even, competitive racing. Scale livery is encouraged. Drivers are encouraged to operate both within the letter and spirit of the rules.

Novice: Any 1/10th or 1/12th scale electric chassis. Tamiya 540 silver can or Novak SS Pro 25.5t (PN: 3625V), Ballistic 25.5t (PN: 3425V), and Ballistic Boss VTA Edition (PN: 3626V) brushless motors recommended. ROAR-approved Sportsman ESC recommended for brushless motors. Maximum 6-cell NiMH or NiCd batteries or maximum 7.4v 2S lithium technology batteries. Lithium technology batteries must be in hard case.

Formula 1: Any 1/10th scale rear wheel drive electric chassis. 190mm maximum width. 4mm minimum ride height. Tamiya 540 silver can or 21.5t brushless motor. ROAR-approved Non-Timing ESC for brushless motors. F1 scale rubber tire. Front and rear wings to scale and correct with body. Maximum 6-cell NiMH or NiCd batteries or maximum 7.4v 2s lithium technology batteries. Lithium technology batteries must be in hard case.

ROAR Rule Book v13.0

ROAR Approvals Page

*As regards brushless rotors for Stock classes, please be in compliance with Section 8.8.4.4 of the current rule book.

The Trinity D3.5 17.5 and 13.5 and all tuner variants is banned from spec classes.

Race Programs: Stock Touring, Modified Touring, Stock 1/12th, Modified 1/12th, Scale Spec and Novice will be run on Saturdays in the Magnuson Park Community Center gymnasium, with 9 transfers straight to the A-Main and 1 bump up from the B-Main to the A-Main. Stock Touring, Stock 1/12th, Scale Spec, Novice and WGT will be run on Wednesdays in the Magnuson Park Hangar 30, with 7 transfers straight to the A-Main and 1 bump up from the B-Main to the A-Main.

Stock Touring, Modified Touring, Scale Spec, Formula One, Modified 1/12th, and Novice are run at Seatac R/C Raceway with 9 transfers straight to the A main and single bumps  out of the B main.

The Competition Committee may elect to run additional classes at special events, such as the Emerald City Classic and Can-Am Challenge races.

Corner Marshalling: Immediately following a round, after placing their car / transmitter on the table adjacent to the drivers’ stand, the just-finished drivers are expected to proceed immediately to the track and Corner Marshall for the next round.

Race Fees: Race fees paid by drivers are used to fund club operating expenses (e.g. rent, consumable materials, etc.). Race fees are:
— Standard Entry: $20 per class.
— Family (direct family) Entry: $35 per family. 1 class each family member
—$20 for each additional class at Magnuson Park, $10 for each additional class at Seatac

Point Series Rules: A point series will be kept through the season. Point series rules are:
1. Wednesday Series and Saturday Series are separate.
2. 100 points for 1st place, 80 for 2nd, 70 for 3rd, 65 for 4th, 62 for 5th, 61 for 6th and one-point-split for 7th through Nth place. 1 point for TQ.
3. No substitute drivers.
4. Drivers must finish one lap of the main to earn points.
5. Awards at end of season to driver finishing 1st, 2nd, and 3rd place for each participating class.
6. Participating classes are: Saturday series Stock Touring, Modified Touring, Stock 1/12th, Modified 1/12th and Scale Spec. Wednesday series Stock Touring, Stock 1/12th, Scale Spec and World GT.

Track Records: Any racer setting a new track record must leave their car at the tech table after their race. A Competition Committee member will then validate your car is within specs of the class.

Seattle RC Racers Code of Conduct

Hangar 30 and the Community Center gym are Seattle Parks & Recreation facilities. Seatac R/C Raceway is a Seatac Parks & Recreation facility. All rules pertaining to personal conduct in parks facilities will apply.

The Seattle RC Racers is an all-volunteer nonprofit club. Whether as a racer, an organizer, a race director, tech helper, or spectator, we are all volunteering our time to make our own and our fellows’ race day happen. Accordingly, we are right to expect that we will be treated fairly and respectfully during our time together. Also, we are also duty-bound to treat everyone else fairly and respectfully during their time with us.

If a racer is a having a bad day, but chooses not to remedy himself, and persists in bad conduct, the race director and / or competition committee will exercise the following to enforce the Code of Conduct disciplinary options on behalf of the club:
1. A racer who demonstrates disruptive behavior will be given a warning and asked to take a moment to collect themselves before returning to race activities.
2. A racer who persists with disruptive behavior will be politely asked to leave for the remainder of the event.
3. A racer who is asked to leave twice within any six week period will be suspended from all events for one month.
4. A racer who has received a one-month suspension and upon return is asked to leave again will be suspended for the remainder of the season.

Instances of outstanding bad form will be handled on a case by case basis by the race director, president, and competition committee.

Finally, our program strives to be offer racing that is accessible, affordable, and fun.  Come race with us.  Bring your best stuff, and leave it all on the track.  This is a great sport that will reward years of invested effort.

Race on, brother.




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