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Naval Aircraft Factory PN-9, illustrating the characteristic hull chines The PN-7 was a 1925 development with an improved thicker section, shorter-span wings with a more modern airfoil section, and were powered by two experimental 525 hp (391 kW) Wright T-2 V-12 engines . [ 3 ]
The names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred to as the Manufacturer X.XX/XX, e.g., the Avro B.35/46 – this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698.
In 1928, it merged with Loening and was known as Keystone–Loening. [2] In 1929, it was taken over by Curtiss-Wright . Also in 1929, the Keystone–Loening plant on the East River in New York City was closed by Curtiss-Wright and the operation was moved to the Bristol, Pennsylvania.
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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 ...
Depending on the supercharger fitted, engines were rated as low altitude (e.g.; Merlin 66, Griffon III), where the engine produced its maximum power below about 10,000 feet (3,000 m), medium altitude (Merlin 45), where the engine produced its maximum power up to about 20,000 feet (6,100 m), and high altitude (Merlin 70), where the engine produced its maximum power above about 25,000 feet ...
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.
A portion of the arch surrounding the keystone is called a crown. [4] Keystones or their suggested form are sometimes placed for decorative effect in the centre of the flat top of doors, recesses and windows, so as to form an upward projection of a lintel, as a hallmark of strength or good architecture.