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3. Qualifying trials will be permitted ONLY between the hours of 8:30 A. M. and 12:30 P. M. and between 1:30 P. M. and 5:30 P. M. on August 31, September 1 and September 2, 1948.

4. Pilots will be allowed one practice lap only of the proper speed course when attempting to qualify, following which they shall rock the aircraft's wings violently in front of the grandstand and cut off course behind the timing stand before starting their official qualifying runs.

5. Two consecutive laps of the 15-mile course will determine official qualifying speeds for Thompson Trophy Race entries and for the Sohio Handicap Trophy Race.

6. Kendall Trophy Race entries and Goodyear Race entries will be required to make one official lap only of the proper speed course in order to determine their eligibility from a speed point of view.

7. To be eligible for the Thompson Trophy Race, which is for aircraft with engines of unlimited cylinder displacement, the airplane must make an average speed of 325 miles per hour in the qualifying trials of two laps over the regulation course.

8. The ten (10) aircraft which establish the fastest qualifying speeds during the entire three days of the qualifying trials will be eligible for the Thompson Trophy Race. Starting positions for all Thompson entries will be determined from the times and days on which qualifying speeds were established with the pole position given to the pilot who establishes the fastest speed on the OPENING day of the qualifying trials. Second and third positions, etc., will be awarded to those pilots who make the next fastest qualifying speeds on the OPENING day of qualifying, etc.

9. Two qualifying trials will be permitted an entrant if necessary but all aircraft making the minimum qualifying speed on their first attempt will not be permitted the additional trial. If during an official qualifying run, the pilot develops engine or other trouble, he should not complete the official qualifying run- following which he shall be allowed another try. More than two attempts to qualify for any race will not be permitted.

10. A cash purse of $100.00 each will be awarded the ten entries who qualify at the greatest speeds on August 31, 1948. This does not apply to Goodyear and Kendall entrants.

11. A cash purse of %50.00 each will be awarded the ten unlimited displacement entries who qualify at the greatest speeds on September 1, 1948. This does not apply to Goodyear and Kendall entrants.

12. All feminine Kendall entries, if more than eight (8), must qualify on Wednesday, September 1, 1948 ONLY.

13. Qualifying speeds will be released by the official timers to the pilots and the press only twice a day- at 11:30 A. M. and 5:30 P. M. on August 31, September 1 and 2, 1948.

D- THOMPSON TROPHY RACE ENTRIES- SPECIFIC REGULATIONS

1. Open to any CAA certificated aircraft, with any type engine or propeller. Water injection and any type fuel is permitted.

2. Major changes to aircraft and engines will not be permitted after arrival at the Cleveland Municipal Airport. When aircraft arrive at the Cleveland Airport they will be impounded to the extent that seals may be placed on the mounting of major engine parts. Only minor repairs will be permitted after this action and these will be allowed only after permission has been granted by the Race Technical Committee. Aircraft must remain at the Cleveland Municipal Airport after their arrival.

3. Constant surveillance of aircraft and the work being done thereon, will be maintained following approval of these aircraft by the Race Technical Committee.

4. Forced draft ventilation of cockpits for aircraft powered with engines mounted in the nose ahead of the pilot is required.

5. Minimum altitude for the Thompson Trophy Race is 200 feet; maximum altitude is 500 feet.

E-GOODYEAR TROPHY RACE ENTRIES-SPECIFIC REGULATIONS

1. Motors- must not exceed 190 cubic inches piston displacement. They must carry an Approved Type Certificate and may not be altered structurally or otherwise except as approved by the manufacturer. Ports may be polished but not enlarged. Newly A. T. C.'d engines must be in sufficient quantity production to be available to all. Such engines must be A. T C.'d and publicly announced by the manufacturer at least six (6) months previous to entry in a race.

2. Propellers- must be fixed pitch in flight. Adjustable type (on the ground) is permitted. Any type of material may be used.

3. Wing Area minimum of 66 square feet of wing area must be used, including that area displaced by the fuselage, but not including fillets and stall strips. Flaps are permitted, but wing area is to be figured with flaps retracted.

4. Weight- the dry, empty weight must be at least 500 pounds.

5. Landing Gear- must be of a non-retractable type. Wheels must be 5.00 x 5 or larger. Brakes ae compulsory.  At least two wheels of specified type and size must be used. Auxiliary or third wheel on tricycle type may be of any size, but not retractable. When conventional type gear is used, the point of contact of the main wheels must be at least 15 degrees forward of the C. G. of the ship when in flying position.

6. Vision- a field of vision must be provided of 240 degrees in the horizontal plane (45 degrees to the rear of pilot's eyes in both directions); 140 degrees from top of cowl upward and aft; 25 degrees from pilot's eyes to top of leading edge of wing at the fuselage and 5 degrees to top of cowl. Obstructions in this field such as the top wing of a biplane or a high wing type monoplane, shall be approved by the National Air Races Technical Committee. Canopy must provide minimum of 6 inches form eye level to top of enclosure when in normal sitting position and must permit pilot to turn his head sufficiently to attain field of vision specified with crash helmet on. Normal sitting position will be considered that from which pilot has the required vision.