Curtiss P-6 Hawk
…224 kW) Pratt & Whitney R-985 Wasp Junior radial, one became the XP-21A when modified with the R-975, and the other was converted to the P-1F standard XP-22 Temporary designation for a P-6A used to test new radiator installations for the V-1570-23 and converted back to a P-6A XP-23 Model 63, unfinished P-6E…