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The North American BT-9 was the United States Army Air Corps (USAAC) designation for a low-wing single engine monoplane primary trainer aircraft that served before and during World War II. It was a contemporary of the Boeing-Stearman PT-13 Kaydet biplane trainer which pilots learned to fly on before advancing to Basic Flying Training on the BT-9.
The improvement of the BT-9 with a longer metal skinned fuselage as on the NA-44 would create the NA-64 (Yale) and improved wings would result in the BT-14. NA-16-5 Single-seat fighter - although this designation was never used, it became the NA-50 for Peru, and later the NA-68, which saw limited USAAF service as the P-64. [23] BT-9 (NA-19)
The BT 4x4 was characterized by its square shape with dimensions of 4 by 4 meters, as opposed to the type (BT-9) with its more slender dimensions of 2 x 2 meters. The other visual key difference between the two types are the windows on the top floor: The windows of the BT 4x4 do not run the full width of the tower whereas the windows in the BT ...
The BT tanks were "convertible tanks". This was a feature that was designed by J. Walter Christie to reduce wear of the unreliable tank tracks of the 1930s. In about thirty minutes, the crew could remove the tracks and engage a chain drive to the rearmost road wheel on each side, allowing the tank to travel at very high speeds on roads.
BT-9A Armed BT-9 with one cowl gun and one rear flexible gun, and modified canopy. 40 built. BT-9B Minor changes from BT-9, unarmed. 117 built. 1 modified as sole BT-9D which was modified as a prototype for BT-14 with new outer wing panels and other alterations. BT-9C Wright R-975-7, similar to the BT-9A with minor changes. 66 built BT-9D
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Designated YPT-9 by the Army, it failed to gain any orders. All models went through a number of engine changes (resulting in new designations for both the military and civil aircraft). All models went through a number of engine changes (resulting in new designations for both the military and civil aircraft).
BT Group plc (formerly British Telecom) is a British multinational telecommunications holding company headquartered in London, England.It has operations in around 180 countries and is the largest provider of fixed-line, broadband and mobile services in the UK, and also provides subscription television and IT services.