Model Variants (Including Prototypes)
XP-60 - Base Series Designation; original prototype with Rolls-Royce Merlin engine; 8 x 0.50 caliber machine guns.
XP-60A - Fitted with Allison V-1710-75 inline engine; B-14 turbosupercharger; 6 x 0.50 caliber machine guns.
YP-60A-1 - Proposed preproduction designation of XP-60 prototype.
P-60A - Proposed designation of production quality XP-60
P-60A-1 - Proposed designation of production quality XP-60C prototype.
XP-60B - Prototype with V-1710-75 engine with SU-504-2 turbosupercharger; 6 x 0.50 caliber machine guns.
XP-60C - Prototype with experimental Chrysler XIV-2220 engine; fitted with PW R-2800-53 instead and driving contra-rotating propellers; 6 x 0.50 caliber machine guns.
XP-60D - XP-60 revised with Packard V-1650-3 engine; lost to crash in May 1943.
XP-60E - Xp-60B with PW R-2800-10 engine
YP-60E - YP-60A-1 with bubble canopy and four-blade propeller.
XP-60F - Proposed revision of YP-60A-1 with alternate PW R-2800 engine.