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speed established in the Qualifying Races. At a given signal all airplanes will take off together.
(c) For "Formation Starts" (Race Horse) starting time for all airplanes will be taken from the time the first airplanes crosses the starting line in flight. Finish time will be taken at the finish line. When individual standing starts are used, starting time will be taken from the starter's flag.
(d) In taking off in "Formation Start" (Race Horse)no airplane shall cut in front of another until a safe distance has been gained. Any airplane passing another airplane must keep at least 150 feet to the right, or 50 feet above the airplane being overtaken.

2. All pylon turns must be made to the left and outside of the pylon.
3. An airplane overtaken must hold its true course in order that it may not in any way impede or interfere with a faster, overtaking plane.
4. An airplane overtaking a slower airplane shall never attempt to pass between that airplane and the pylon.
5. After crossing the finish line, all airplanes shall continue on their course until they have attained an altitude of 1,000 feet, then they may turn and return to the airport and land in that part of the airport assigned for landing and in so doing shall not cross the course of the finish line.
6. Pilots shall pass all turning points in plain view of the observing officials, stationed at each turning point, and at n altitude of not over 500 feet.
7. Cancellation of a race in progress. The Contest Directors shall have the power to cancel or declare finished a race in progress, If the race has been 60% or more completed at the time that a red flag is displayed at the start and finish line, the race shall be declared finished. If it is not 60% completed, it shall be declared cancelled and run over at a later date. Responsibility of seeing the cancellation flag rests with the contestants.
8. Pilots must at all times be on the lookout for transport airplanes in the vicinity of the airport and in taking off and landing. Transports are to have the right-of-way at all times in the vicinity of the airport.
9. The Contest Committee reserve the right to change the length of any race course or the length of any race.
10. Finish of the Race--The finish of all closed courses races will be made by passing over the finish line in front of and at right angles to the grandstand, after completing the required number of laps in the closed course or other prescribed course.
11. The National Contest Board reserves the right to interpret these rules and regulations and make any changes they deem necessary.
M--PYLON TURNS DURING RACE--WHAT CONSTITUTES CUTTING OF PYLON
1. A pilot who has cut the pylon (turning inside ir having any part of the plane over the pylon constitutes "cutting") may validly continue in the race provided he makes a complete turn around the same pylon in proper direction of the race before continuing his course; otherwise, he is automatically disqualified from the event.
N--WINNER OF THE RACE
1. The winner of the first place, in any race where speed is the determining factor, shall be the pilot who has completed a full race in the shortest elapsed time, and of second place, the second best time, etc., provided the pilot is not disqualified and no protest has been filed. 

Rules for Qualifying Races
1. Because of the increased prize money and new interest in airplane racing, it is natural to expect a large increase in the number of racing airplanes at the 1937 NATIONAL AIR RACES. To create more events and at the same time, retain the feature races (397 cu. in. FEATURE RACE, LOUIS W. GREVE TROPHY RACE and THOMPSON TROPHY RACE) which have played such an important part in the development of airplane racing, a new program of qualifying races will be inaugurated at this year's event.
2. There will be two Qualifying Races for each of the Feature Races (397 CU. IN. FEATURE RACE, LOUIS W. GREVE TROPHY RACE, and THOMPSON TROPHY RACE). An airplane will only be allowed to compete in one if the Qualifying Races in each cubic inch group but must compete in one of the Qualifying Races to be eligible for the FEATURE RACE for that Group. Airplanes with smaller cubic inch displacement may compete with airplanes of a larger cubic inch displacement, providing they qualify under the rules governing Qualifying Races.
3. The entries in each cubic inch displacement (397, 549 and unlimited) will be divided into Two Groups. Each group to compete in one of the Qualifying Races.
4. A maximum of 10 airplanes will be allowed to start in any Qualifying or Feature Race.
5. If there are less than 10 starters in any race, the airplanes having made the fastest time from a lower cubic inch group may fill up the vacant places in a larger cubic inch group to a maximum of 10 starters.
EXAMPLE: the airplanes making the fastest speed in the 397 Qualifying Race Group I may compete in the Louis W. Greve Qualifying Race Group I, if there are less than 10 starters; The airplanes making the fastest speed in the 397 Qualifying Race Group II may compete in the Louis W. Greve Qualifying Race Group II, if there are less than 10 starters, etc.
6. The method of assigning the airplanes to the two groups will be as follows:
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