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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.
X.4/44 OR.160 Tank-carrying heavy glider capable of carrying 7-ton load and returning under its own power General Aircraft Hamilcar X: N.5/44 OR.162 Naval carrier-version of Hornet de Havilland Sea Hornet: E.6/44 OR.170 Written for Saro SR.44 flying-boat jet fighter Saro SR.A/1: N.7/44 OR.167
The contract was ultimately won by Martin for their Model 139, known as the B-10 Bomber. This was to be the last design submitted to the military by Keystone. [3] Keystone itself became a manufacturing division of Curtiss-Wright and ceased production in 1932. [4] The former Keystone plant was purchased by Fleetwings in 1934. [5]
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.
The B-3 was originally ordered as the LB-10A (a single-tail modification of the Keystone LB-6), but the Army dropped the LB-'light bomber' designation in 1930. Although the performance of the B-3A was hardly better than that of the bombers flown at the end of World War I , it had come a long way in terms of flight safety.
Seven aircraft ordered but delivered as the Y1B-4 and Y1B-6 with different engine installations. Y1B-6 Two pre-production aircraft and three converted B-3As, as the LB-10 but with two 575 hp (429 kW) Wright R-1820-1 engines. B-6A Production version of the Y1B-6, 39 built.
Designed as LB-10 with 575 hp (429 kW) Pratt & Whitney GR-1860 engines; three ordered, but redesigned with 525 hp (392 kW) Wright R-1750-3 engines and delivered as the Y1B-5. Y1B-5 Three pre-production aircraft redesignated from LB-14 before delivery. B-5A Wright R-1750-3 version originally ordered as B-3A, 27 built
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 ...