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Four PN-10s were built, and while similar to the PN-9, each was given a different engine as the Packard 1A-2500 engines were disappointing. One was fitted with Packard 1A-1500 and another with a Packard 3A-1500 , both V-12 water-cooled engines and one each was fitted with the Wright R-1820 and Pratt & Whitney R-1690 radial engines.
A keystone module is a standardized snap-in package for mounting a variety of low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface-mount box, or a patch panel. Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs.
The Keystone entry was for an all metal low winged monoplane bomber with retractable landing gear. The bomber would be powered by two Curtiss V-1570 geared Conqueror engines. With a crew of 5 it was armed with up to 3 x .30 caliber machine guns and could carry 2,000 lbs (907 kg) of bombs on external racks.
1/20 None First spec. issued: spares carrier Bristol Type 37 Tramp: 2/20 'Interim' single-engine heavy bomber Avro Aldershot, de Havilland DH.27 Derby: 3/20 Single-seat deck-landing torpedo-carrier – Spec. superseded by 32/22 (q.v.) Blackburn Dart (modified), Handley Page H.P.19 Hanley: 4/20 Long-distance photographic and reconnaissance aeroplane
Keystone species, species that have a larger effect on their environment than is purely due to their abundance; Operation Keystone, during World War II; Keystone, a variety of screwdriver blade "Keystone", a descriptive reference to the Book of Mormon; The Keystone, journal of the Pennsylvania Railroad Technical and Historical Society
LB-10 The last of the 17 LB-6s ordered (S/N 29-27) was converted with a re-designed single fin and rudder and two 525 hp Wright R-1750E engines. Delivered to Wright Field on 7 July 1929, it was wrecked on 12 November 1929. LB-10A This version used Pratt and Whitney R-1690-3 Hornet engines and was slightly smaller, in both wingspan and length.
With the residents of Virginia′s Tangier Island and Maryland′s Smith Island facing starvation after a severe winter storm and with ships unable to reach the islands due to heavy ice in the Chesapeake Bay, an Army Air Corps 49th Bomb Squadron B-6A made a one-hour, 54-mile (87-km) flight from Langley Field, Virginia, to Tangier Island on 9 ...
On April 28, 1931, the army ordered 25 improved Y1B-4s as the Keystone B-4A. This production version was part of the last biplane bomber order made by the Army Air Corps (along with 39 B-6As, identical in all respects except their make of engine), and the B-4As, delivered between January and April 1932, were the last biplane bombers delivered ...