These were posted on the Thunderbirds website:
These Q-25 rules have been written as a guideline for this class of entry level sport pylon racing and are based on the Event 424 rules listed in the AMA Competition Regulations 2009-2010 Rules Governing Model Aviation Competition in the United States.
*************** If the rules don't say you can do it, then you can't do it! ***************
1. Aircraft must be a single engine, single wing type with an integral landing gear. All aircraft must be able to ROG (rise off ground) from an idling start.
2. AMA Event 424 legal Quickie 500 racers only: Aircraft can be ARF, kit, or scratch built (all aircraft must comply with all Event 424 dimensions). Wing and tail must be constructed of solid wood or wood over a solid foam core. No composite material wings or tail feathers are allowed. Minimum empty weight (no fuel) of 52 oz. (3-1/4 lbs.) Fuel tank can be any standard molded type or a bubble-less fuel tank only. *** No pressure bladder fuel tanks allowed.*** Stock racing wheels can be replaced with an after market brand, but must be 2-1/4" minimum diameter.
3. Flight Controls: All aircraft must have all (4) radio flight controls operational these include: throttle, aileron, elevator, and rudder (ruddervator if V-Tail). Each clevis on a pushrod must have a safety (i.e. fuel tubing) to prevent accidental opening. If a clevis is used on each end of a push rod, only (1) may be adjustable (i.e. 1 clevis must be soldered).
4. Engine must be an OS .25 FX, OS .25AX, or GMS .25 for this class. Starting in 2010 any other engine must be approved by the contest directors. All engines must be a front intake, side exhaust type using only the stock factory furnished "Out Of The Box" expansion chamber muffler and fully functional factory stock throttled type carburetor. All engines must be capable of sustained idle and be shut down by radio. *** No engine or muffler modifications allowed except to remove the baffle from the muffler and to relocate the rear needle valve assembly if broken off or replace the factory remote needle valve with an after market remote needle valve assembly. ***
5. Spinner or Prop Nut: On all aircraft the front end of the engine crankshaft shall be covered with a rounded spinner or safety nut. A spinner with a flat, oval, Allen (Hex) of at least 3/16-inch in diameter on the front fulfills this requirement.
6. Fuel: Shall be commercially blended fuel containing not more than fifteen (15) percent nitromethane.
7. Propeller: Shall be commercially available APC or Master Airscrew (no carbon fiber composite or wood) with a minimum diameter of eight (8) inches and a nominal pitch of six (6) inches. ** No prop modifications except to sand/debur the sharp edges for safety or sand prop blade (one side only) for balancing. **
8. Pylons will be set up by 11:45am for pre-race practice until 1:00pm. Pre-race practice is optional for all race pilots.
**** Flight line will be closed to all race pilots at 1:00pm ****
9. Entry fee: $10.00 per pilot. All pilots must have a current AMA membership card.
10. Registration opens at 12:00pm and closes at 1:00pm, pilots should arrive by 12:00pm to get registered and have their aircraft and equipment inspected prior to the pilots meeting.
11. Pilots meeting starts at 1:00pm for racing rule questions and pilot heat bracket assignments.
12. First Heat Race begins at 1:30pm sharp.
13. Heat Matrix: Pilots will draw a pilot number at event registration and will be placed in a color column/lane after registration for heat assignments. All pilots on the same 72MHz frequency will be placed in the same color lane to avoid radio frequency conflicts. This means they never race against the pilots in their color lane, but race against the other pilots and fly the same total number of races. All pilots will remain in their assigned color lanes throughout the entire event.
14. Wing Marking/Aircraft Number: All aircraft for 2009 will have a number. The number style is up to you except (no block numbers allowed) but any other style at least 8-1/2" tall x 4" to 4-1/4" wide for double numbers, single numbers at least 8-1/2" tall x 6" to 8" wide. Both double or single numbers must be a contrasting color to the wing color, wing color behind the numbers must be one color, and be positioned from the end of the aileron toward the wing tip on the top and bottom of the Right Wing Only and orientated to be read correctly when the right wing is up.
15. *** All Pilots, Callers, Helpers, and Race Officials must wear an OSHA approved safety helmet (hard hat) at all times when beyond the pit safety fence. ***
16. Two 20' tall pylons, set 450' apart at the North/South ends of runway are used for this class. Pilots must fly above the 20' high pylons at all times during the race except for takeoff and landing. A warning for low flying will be given to the pilot for flying below the pylons, after (2) warnings the pilot will be black flagged and disqualified.
17. ALL HEAT RACING/FLYING WILL BE EAST OF The Runway Proper. Runway edge is the start of the DEAD LINE (No Fly Zone). Southbound leg must be flown East of the Runway/DEAD LINE (No Fly Zone) a warning will be given any pilot who flies over the pit side of the Dead LINE (No Fly Zone), after (2) warnings the pilot will be black flagged and disqualified for that heat. The Northbound leg must be flown east of pylon course center line.
18. Starting procedures: Aircraft will be carried to their assigned starting positions on the start/finish line when starter calls for the next heat race. Starter will call "start your engines", Pilots and Callers will have (90) seconds to start their engine. Pilot must go to pilots box and get ready to takeoff. Starter will motion the pilots to idle their engines. Starter will acknowledge each pilot's readiness. Starter will indicate to callers to hold aircraft for throttle up. Starter will call "Pilots Ready" and raise the flag, at which time all pilots will go to full throttle. Starter will drop the flag down for positions 1 & 3 to launch first, then raise the flag up and drop it again for positions 2 & 4 to launch. Caller can only release their pilot's racer due to safety issues there will be NO PUSH OFF STARTS or pilot will be disqualified for that heat. This type of start allows separation of the aircraft for a safer start. In odd numbered heats 1 & 3 launch first and in even numbered heats 2 & 4 positions launch first. In a (4) round race each pilot should get (2) first launches and (2) second launches. *** Pilots must be in the pilot box to takeoff ***
19. Any aircraft crossing the start/finish line before the start flag drops will be penalized (1) lap and will have to fly at least (11) laps to receive heat points. After start time has expired, NO RESTART or TAKE OFFS WILL BE ALLOWED and pilot is disqualified for that heat race, scored as DNS (Did Not Start) and (0) points will be scored.
20. The Race Event will consist of four (4) ten-lap heats, a maximum of four (4) aircraft per heat.
21. Points: 1st= 4, 2nd= 3, 3rd= 2, 4th= 1.
22. The overall winner is determined by highest heat points total. Point Tie Breakers will be determined by: (1) Total points for all Heat Races, (2) Fewest number of cuts, or (3) Total number of Heat Races.
23. All pilots must fly beyond (pass & around) both pylons for each lap of a heat race. This means you must try not to cut any pylons. Racers must finish all (10) laps to score a completed heat and receive heat position points. Any cuts will result in an extra lap being flown per cut up to a maximum of (2) cuts for any ten (10) lap heat race. Reference (1) cut pilot must fly (11) laps, (2) cuts pilot must fly (12) laps. Any pilot with three (3) or more cuts will forfeit his/her finishing position for that heat race and zero (0) points will be awarded even if pilot finishes all ten (10) laps. Any pilot deliberately cutting the course to gain a lead or advantage will be disqualified for that heat race, possibly for the race series and zero (0) points will be awarded.
24. All pilots must cross the finish line on lap 10 (no cuts), lap 11 (one cut), or lap 12 (two cuts) and continue flying out pass the south pylon before pulling up off the course. This lets the pylon judges know the pilot has completed the required number of laps and that this action is not to be scored as a pylon cut. *** No aerobatic flying or extra laps on the race course after a pilot completes his/her required number of heat laps. Any violation of this rule will result in a disqualification of that heat. *** Pilots should land as soon as safely possible so the next heat can start.
25. All protest, rules interpretations or violations will be reviewed by a selected (5) member Q-25 pylon race committee made up of active sport pylon racers and the Contest Director(s). Any violation of the Q-25 racing rules, including engine, muffler and or airframe modifications will be grounds for dismissal from the Q-25 Pylon Racing Series. Any pilot found in violation of these rules by unanimous vote of the race committee will be banned from participating in any Q-25 Pylon Races. This is a "Zero Tolerance Rule" and Committee or Contest director's decision is final.
Dan Roland - Webmaster