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None of the above indicated changes, or any other which voids the A. T. C. of the engine, are permitted. Any entry which arrives at an air race meet with an altered engine, on which the A. T. C. has been violated, will subject the aircraft to disqualification by the Race Technical Committee established to inspect thoroughly the engines in those aircraft which dem-onstrate superior speed performance in the qualifying trials and heat races.
2. PROPELLERS - Must be fixed pitch in flight. Adjustable (on the ground) type may be used. Any type of material may be used.
3. WINGS - Minimum of 66 square feet of wing area must be used, including that area displaced by the fuselage, but not including fillets or stall strips.
Flaps are permitted but wing area is to be figured with flaps retracted.
Ailerons should be 100% dynamically balanced. In lieu of this, 100% static balance with counterweight outboard of spanwise center of gravity of the aileron will be acceptable. Any other method of balance is subject to approval or rejection by the Technical Committee of the N. A. A. Contest Board.
4. WEIGHT - Dry, empty weight must be at least 500 pounds.
5. LANDING GEAR - Non retractable type. Wheels must be 5.00 x 5 or larger. Brakes are com-pulsory. At least two wheels of the specified type and size must be used. Auxiliary or third wheels 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.
All ships may be required to taxi past the grand-stands in parade before each race and it is advisable to provide a steerable or caster type tail wheel (remov-able if desired) for this purpose.
6. VISION - A filed of vision must be provided of 270 degrees in the horizontal plane (45 degrees to the rear from pilot's eyes in both directions), 140 degrees from top of cowl upward and aft, 25 degrees from pilot's eyes down to top of leading edge of wing at the fuselage and 5 degrees down to top of cowl. Obstruc-tions in this field of vision must be of a minor nature and must be submitted by an accurate diagram to the Technical Committee of the N. A. A. Contest Board for approval prior to the start of construction. Canopy must provide minimum of 6 inches from eye level to top of inclosure when pilot is in normal setting position and must permit turning his head, with crash helmet on, sufficiently to attain the field of vision required.
7. NOSE-OVER STRUCTURE - Substantial pro-tection for the pilot other than the fin must be provided either fore or aft of the pilot cockpit. Structure should not obstruct forward visibility.
8. FUEL TANKS - must have a minimum of 15 gallons capacity but need not be filled to capacity for short races. Any type of fuel may be used.
9. MATERIALS AND WORKMANSHIP - must conform to aircraft standards or equivalent. Contest Committees are empowered to refuse permission to fly, attempt to pass flight test requirements or to qualify any ship, which in their opinion, is not up to reasonable, safe standards in either materials, work-manship, detail design or condition as a result of damage.
10. GENERAL DESIGN - Ships with pilots in prone position will not be permitted. Reclining posi-tion is limited to 20 degrees from vertical. Center of gravity location must fall within a maximum of 12% forward and 28% aft of M. A. C. of the wing unless deviations are permitted by the Technical Committee of the N. A. A. Contest Board.
All builders must submit a three view scale draw-ing (at least 20th scale) to the Technical Committee of the N. A. A. Contest Board for criticism and comment before construction of the ship is started. These drawings should include as much design data and detail information as possible. Drawings should show particularly, details of wing structure and bracing if any, giving type of materials, size and con-struction of spars, ribs, skin, drag bracing, fittings, etc. The location and construction of nose-over structure, giving size of members, etc., should be shown and an estimate of weight and balance submitted. All material submitted will be held strictly confidential.
The Technical Committee of N. A. A. is composed of exceptionally well qualified engineers; its purpose being to pass on and approve designs submitted relative to compliance with these specifications. In addition, this Committee will disapprove particular points of any design not covered by the specifications which appear to make the design unsafe. If a struc-ture is questionable, a qualified engineer will be recommended by the chairman of this Committee, who will, for a nominal fee, write appropriate analysis and determine proper sizes of members, skin, etc. If preferred, the services of a qualified local engineer may be used who will make sufficient analysis to satisfy this Committee that the proposal is satisfactory. Drawings and data are to be mailed directly to the Contest Board, N. A. A., 1025 Connecticut Ave., N. W., Washington 6, D. C.
11. INSPECTION - The winners of the first three places in the finals of each series of races will be impounded immediately following the race and will be inspected by a committee of three, consisting of the chairman of the Air Race Technical Committee, a representative of the P. R. P. A. and a representative of an engine manufacturer. Ships with engines found to be altered will be disqualified and appropriate action taken against the owner and/or pilot, or both.
12. FOREIGN ENTRIES - Foreign ships, built by private enterprise, using a United States build engine, carrying an A. T. C., are eligible.
13. FLIGHT REQUIREMENTS - Before attempt-ing to pass flight requirements, ships will be required to show certified flight testing time of at least five hours, consisting of no less then ten flights. Before being permitted to qualify for a race, each ship will be required to demonstrate the following flight character-istics before the Air Race Technical Committee. All Goodyear entries must have been flight tested before their arrival at Cleveland.
[[indent]] (a) Take-off at full throttle without veering more than thirty feet to either side of a straight line on the ground directly into the wind. [[\indent]]
[[indent]] (b) Pull-up from straight and level flight (shallow starting dive permitted) to a minimum of 6-G acceleration. Pull-ups to be done above 5,000 feet of altitude and at 175 m.p.h. or the maximum speed of the aircraft, whichever is lower. 6-G pull-ups may be performed prior to attendance at a race meet, if the pilot or builder will substan-