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Aviation History
1926
1926 - 0315.PDF
MAY 6, 1926 W*f%3$& GOODYEAR "PILGRIM TYPE AD AIRSHIP 60 K P. LAWRENCE ENGINE THE GOODYEAR PILGRIM TYPE AD AIRSHIP : Side, front and rear elevations. six radiating cables which attach to the interior of the envelope. These cables tend to hold the nose out, even at zero pressure. This arrangement is of the self-energising type—resembling a bow and arrow system, where the tube represents the arrow. Stability being an item of importance on a small airship of this type, large surfaces, well streamlined, were decided upon to give the ship excellent manoeuvring qualities. The envelope is 105 ft. 6 in. long and 31 ft. 6 in. diameter, this shape being selected on the score of having less resist- ance as well as being economical from the standpoint of surface area. But one ballonet is provided with its centre of volume located over the centre of disposable load, so there should never be any serious out-of-trim conditions during flight. As regards performance, the " Pilgrim " has a speed of SI m.p.h., and a fuel consumption of 4-6 gals, per hour. While provision is made for carrying two passengers and the pilot, the number carried depends upon the desired cruising radius and the desired ceiling. The petrol tank has a capacity of 32 gals. The small mooring mast attachment on this ship consists of a 32-in. diameter aluminium spinner securely bolted to a fabric reinforcement located on the underside of the envelope near the nose. This arrangement was made for the purpose of simplicity of attachment and the satisfaction of having a mast that is but 16 ft. high, which can be easily transported and erected in a few moments. Release is either controlled from the ground or from the car, and the mechanism consists of a doll pin, which is withdrawn by a cord and permits the airship to be released at will. The characteristics of the " Pilgrim " Type AD airship are:— Length of envelope Diameter of envelope Volume (theoretical) ,, (5 per cent, stretch) Height of ship Width of ship Fineness ratio Surface area Ballonet volume Do. per cent, of envelope Ballonet surface area Area of upper fin . . ,, lower fin .. ,, Horizontal fins Rudder . . ,, Elevators Length of car Width of car Height of car Weight of envelope ,, ballonet ,, tail surfaces . . accessories Total weight of hull Weight of complete car . . Gross lift (helium) Useful load ,, ,, per cent, of lift Endurance Range, miles 271 105 ft. 6 ins. 31 ft. 6 ins. 50,068 cu. ft. 52,570 cu. ft. 44 ft. 40 ft. 9 ins. 3-4-1 881 sq. yds. 13,750 cu. ft. 275 219-6 sq. yds. 127 sq. ft." 98 sq ft. 238 sq. ft. 545 sq. ft. 99 sq. ft. 14 ft. 6 ins. 3 ft. 9 ins. 5 ft. 9 ins. 619 lbs. 115 lbs. 262 lbs. 312 lbs. 1,348 lbs. 675 lbs. 2,944 lbs. 921 lbs. 32-4 6J hrs. (full), "(half) hrs. 330 (full), 525 (half). C 2 13
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