Model Variants (Including Prototypes)
P-39 - Base Series Designation
XP-39 - Prototype Model Designation sans armament.
YP-39 - Prototype Preproduction Models of which 13 were produced; improved XP-39 model.
YP-39A - Preproduction XP-39 Model fitted with an Allison V-1710 engine sans turbocharger; single high-altitude test frame conversion model.
YP-39B - Based on the XP-39; fitted with new engine sans turbocharger; single unit produced.
P-45 - Initial Production Designation offered by the US Army to signify major changes to model P-39C; later dropped in favor of P-39 designation.
P-39C - Initial Production Models; 80 examples produced; 60 P-39C models became P-39D types.
P-39D - Production Model fitted with self-sealing fuel tanks and increased heavier armament (addition of 2 x 12.7mm machine guns in upper forward fuselage); Allison V-1710-35 water-cooled engine generating 1,150hp; conversion models from P-39C series.
P-39D-1 - Lend-Lease Model with Hispano-brand 20mm cannon; improved P-39D models with self-sealing fuel tanks; 863 examples produced.
P-39D-2 - Lend-Lease Model with Allison V-1710-63 (E6) powerplant; improved P-39D-1 model series; 158 on order; 1 conversion model from P-139D-1.
XP-39E - 3 examples produced with new powerplant of Continental I-1430-1 at 2,100hp; becoming the XP-63 "Kingcobra" prototype.
P-39E - Improved P-39D-1 model; though 4,000 were on order none of this type were produced.
P-39F-1 - Based on the P-39D model but fitted with Aeroproducts-produced constant-speed propeller system.
P-39F-2 - P-39F models modified for photo reconnaissance duties; 2 converted as such.
P-39G - 1,800 were ordered though eventually becoming the K, L, M and N models in the series.
P-39H - Designation Not Used
P-39J - Modified P-39D-1 model series with new engine and auto boost feature; 25 examples produced.
P-39K - Fitted with V-1710-63 powerplant and Curtiss-produced propeller system; based on P-39F model series; 210 examples produced.
P-39L - Modified P-39K series with Curtiss brand propellerand rocket rails installation; 250 examples produced.
P-39M - Fitted with V-1710-83 powerplant capable of 1,200hp and a larger propeller system; gearing changed; 240 examples produced.
P-39N - Improved P-39M series; fitted with V-1710-85 powerplant; decreased armor protection and fuel for increased weight and performance.
P-39P - Designation Not Used
P-39Q - Improved P-39N series; 1 x 37mm cannon and 4 x 12.7mm machine guns - two held in underwing gunpods and synchronized to fire through the propeller.
Bell Model 14 - French Order Model Designation; never delivered.
Airacobra Mk I - British Delivery Models
P-400 Airacobra I - Royal Air Force Designation
TP-39F - Dual-Seat Trainer Model
RP-39Q - Limit Production Dual-Seat Trainer Model
F2L - US Navy Target Drone Designation
XFL-1 "Airabonita" - Single Example Prototype Model for evaluation by US Navy; traditional landing gear array instead of tricycle type.
A-7 - Proposed Radio-Controlled Drone
TDL - US Navy Radio-Controlled Target Drone