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MEN'S DERBY (HANDICAP)
Total Purse $6,000

The Men's Derby shall start from some western city to Cleveland, over a route to be later announced. This race open to any cubic inch piston displacement, cabin or open type plane, complying with general regulations governing plane eligibility for derbies.

WOMEN'S DERBY (HANDICAP)
Total Purse $6,000

The Women's Derby shall start from the same western city as the Men's Derby, to Cleveland, following the route of the Men's Derby. This race is open to any cubic inch piston displacement, cabin or open type plane, complying with general regulations governing plane eligibility for derbies.
SPECIAL NOTE: ALL BONAFIDE ENTRIES FINISHING BEFORE SIX O'CLOCK ON DERBY DAY, BUT NOT PARTICIPATING IN THE PRIZE MONEY WILL BE PAID $150.00 CONSOLATION MONEY. [[stamped]] THIS APPLIES TO ALL DERBIES [[/stamped]]  ^[[3000]]

SWEEPSTAKE PRIZE,
$2,500 VALUE

In addition to the individual prize for both Men's and Women's Handicap Derbies, there will be a grand prize in the form of sport automobile value at approximately $2,500.00, for the man or woman pilot with the best percentage according to the handicap formula.

METHOD OF HANDICAPPING

All airplanes will be flown four times over a one-mile course, at the point of starting the derby by the contestants' choice of any one of three disinterested pilots.

A schedule based on the average speed of these four flights and the air line distance from the starting city to Cleveland will be developed and used as a basis to establish a par (of 100%) for each contesting airplane.

Better performance will be credited as percentage over par and lesser performance will be a percentage deducted from par. The percentage, additional or deduction, will be the number of minutes over or under the original time allowance calculated on that original time allowance.

EXAMPLES
[[7 column table]]
Airplane | Average of 4 Trials | Air Line Distance | Time Allowance, Minutes | Par, Per Cent | Finish Time, Minutes | Score, Per Cent
A ... | 105 mph | 2100 | 1200 | 100 | 1320 | 90.00 |
B ... | 140 mph | 2100 | 900 | 100 | 898 | 100.22
C ... | 140 mph | 2100 | 900 | 100 | 902 | 99.78
D ... | 150 mph | 2100 | 840 | 100 | 800 | 104.78
E ... | 200 mph | 2100 | 630 | 100 | 630 | 100.00
F ... | 210 mph | 210 | 600 | 100 | 660 | 90.00
[[/7column table]]

(1) Propellers should be varnished to prevent change of pitch. Inspections will be made at any stopping point. Any change in propeller will disqualify the contestant.
(2) The Contest Committee reserves the right to run check test at Cleveland or at any point during the race and any increase of R. P. M. 's over 3% will disqualify contestant from this and all other races at Cleveland in 1931.
(3) National Air Races assumes no responsibility or liability in case of accident or damage to any person or aircraft.

GENERAL RULES AND REGULATIONS GOVERNING CLOSED COURSE EVENTS

A - PLANE ELIGIBILITY
(1) Refer to General Rules and Regulations for Engine or Plane Eligibility on Closed Course Events.

B - PILOTS
(1) Refer to General Rules and Regulations governing pilots.

C - LOAD REGULATIONS
(1) In all Closed Course Events, ballast instead of passengers must be carried.

D--RULES OF THE RACE
(1) Method of Starting:
(a) Race Horse Start - If this method of starting proves practical, it will be continued thruout the entire series of Closed Course Events.
(b) Planes entered in any Closed Course Event will be lined up on the starting line, with engines idling, from left to right in order of receipt of entries. At a given signal, all planes will take off together.
(C) In taking off in the "Race Horse" start, no plane shall cut in front of another until a safe distance has been gained. Any plane passing another plane must keep at lease 150 feet to the right, or 50 feet above the plane being overtaken.
(2) All pylon turns must be made to the left and outside of the pylon.
(3) A plane overtaken must hold its altitude and a true course in order that it may not in any way impede or interfere with a faster, overtaking ship.

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