Basic Trainer BT-9 – 14
A student and instructor with a USAAC BT-9 at Randolph Field, Texas. The colours are off in the ad, as the fuselage should be blue. It is definitely a BT-9, not a BT-14. The square windscreen shape, as well as the engine scoops/vents, are dead giveaways that it’s a BT-9. I believe some BT-9’s had the fuselage fabric (at least the removable section) metalized later on in life to help with wear Shane Clayton Originally this BT-9 should have been Blue not yellow.
BT-9 -Basic Trainer with 400hp Wright R-975-7 Whirlwind and a new canopy. Dangerous stall resulted in a variety of unsuccessful fixes. 42 built.
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 – One prototype only, Intermediate step in the development of the BT-14.
Y1BT-10 – 600hp Pratt & Whitney R-1340-41. The first aircraft of a batch of BT-9C completed as Y1BT-10.
BT-10 – The production version of Y1BT-10 – cancelled
BT-14 – Lengthened all-metal fuselage and new canopy, Pratt & Whitney R-985-25, 251 built.
BT-14A – 27 BT-14s were re-engined with 400 hp (298 kW) Pratt & Whitney R-985-11.
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