| Revised 05/04||
- Objective: To provide a racing event which is as closely equal competitively as possible to encourage sport flyers and experienced competition flyers to more enjoy the sport of model aviation while providing a fine spectator event through close racing speeds.
- Applicability: All AMA unified control line racing rules apply to this even except as amended below.
- The plane must be a Carl Goldberg profile stunter or a direct copy thereof. (Kit wood substitution is permitted.) See note #2
The engine mounts and plywood doublers may be lengthened rearward for strength, but they cannot be thickened or thinned.
- The plywood doublers on the elevators may be enlarged and placed on both upper and lower surfaces for strength. The wood elevator horn may be replaced with a metal or nylon one. A wire Veco style control horn may also be used.
- All remaining items must be as per the kit, including rudder offset (3/8") and line sweep. Engine offset may be removed or increased. If new kits are shown with adjustable leadouts, the average sweep must be as the original Goldberg kits are shown.
- No additional wing sheeting will be permitted, nor will any wing thinning or fuselage reduction be allowed.
- Landing gear must be of the two wheel type with a minimum of five inches between the wheels. Either wire or sheet metal type shown on the plans is permitted.
- Wheels must be balloon type at least two (2) inches in diameter.
- The finish should be colorful and representative of a real racing plane, with the canopy either a contrasting color or outlined in a contrasting color. Use of racing numbers is encouraged to represent full scale racing aircraft. If used, they should be placed on each side of the fuselage and upper surface of the left wing. Decals furnished with the kit are recommended, but not mandatory.
- Engines: The engine must be a fox .35 stunt engine, stock number 13500, with absolutely no alterations.The piston and cylinder may be deburred to prevent excessive wear. Needle valve may be cut off and bent over to reduce breakage during turnovers/crashes.
- Fuel Systems:
- The fuel tank may be any type or size. All internal and external fuel tubing and vent tubing must be 1/8 inch outside diameter.
- No fuel shutoffs, pressure systems, or quick fills will be permitted. If plane is equipped with a shutoff, it may be used to get a test flight or needle setting, but it must be bypassed during the race.
- Fuel type shall be 10% nitro, castor oil base, supplied by the contest management.
- Model Weight: Model, fueled and ready to fly must not exceed four pounds.
- Propeller: Any commercially available wood, nylon, polyethylene or polypropylene propeller is permitted. Polyester resin or epoxy resin carbon fiber, fiberglass, or boron fiber reinforced propellers shall not be allowed. (Prohibited are the high cost, ultra-rigid special racing propellers.)
- Glow Plugs:
- Any commercial plug is permitted.
- No hot gloves, electric or mechanical starting devices will be permitted.
- The spinner called out on some plans is no longer available; therefore, a 1 inch spinner of some available type must be used, except that needle nosed spinners will not be permitted.
- If during a race, the propeller must be changed, the spinner must be reinstalled after the prop change prior to continuing the race.
- Racing Crew:
- The pilot must be the entrant and pilot the plane he has entered.
- The pit crew may consist of no more than two people at any one time. (A cranker or holder may be changed provided the person replaced leaves the immediate pitting area. This is to aid some beginning racing types unfamiliar with racing pits.)
- Circle Layout: The inner circle shall be 68 foot radius, and the outer circle shall be 76 foot radius.
- Lines: Lines shall be 60'+/-6" long, .018" diameter cables.
- Pull Test: The entire model and control system shall withstand a 25 pound pull test.
- Races shall consist of a 140 lap race with a minimum of three (3) fliers. All times of a race shall be recorded for comparison with other race times of other races. The quickest time wins.
- Four pit stops are mandatory. If an entrant completes 140 laps without making the required number of pit stops, he shall continue flying and his time shall continue to accumulate until he has completed the required number of pit stops, and then fly one additional lap. The model must be complete, meeting all model specification rules at all times while in flight. No laps may be accumulated while plane fails to meet model specifications.
- If 70 lap heat races are run, there shall be two, run back-to-back and the quickest time will be the determining time for qualification for the 140 lap race. The 70 lap races shall require two refueling stops.
- Except for landings and takeoffs, minimum flying altitude shall be six (6) feet (about head high). Maximum flying altitude shall be below 30 degrees (approximately 30'). Maximum altitude may be exceeded momentarily during passing; however, passing should be done at a minimum safe altitude above the plane being passed.
Note # 1
The no shutoff rule and mandatory pit stops will limit use of small racing props or other proven racing secrets. The severe restrictions placed on this event should encourage new competitors into the racing events by giving them a chance to compete on a reasonably equal status, both monetarily as well as technique or equipment wise, thereby showing them that practice, pilot/pit crew coordination, and getting one's act together is what wins races.
Note # 2
The Carl Goldberg profile stunter kits now permitted are Shoestring, Cosmic Wind, and Buster. Also included are the Brodak's Buster and Shoestring, also the RSM Miss Sarah (Cosmic Wind)
Seventy lap race with two stops will require between 24 and 34 laps per tank, and the four stops in the 140 lap race will require between 28 and 34 laps per tank.