Model Variants (Including Prototypes)
Model 31 - Flying Boat proposal for USN utilizing Davis Wing later used on B-24.
Model 32 - Consolidated company designation
XB-24 - Prototype Model Designation; single example produced; fitted with Pratt & Whitney R-1830-33 radial piston engines of 1,000 horsepower.
YB-24 - Preproduction Models
B-24 - Service Test XB-24 Model; deleted leading edge slots; de-icing boots; 7 examples.
B-24A - Initial Production Model; 30 examples.
XB-24B - Fitted with R-1830-41 turbo-supercharged radial piston engines of 1,200 horsepower each; improved top speed; revised engine cowlings; singe example converted from the XB-24.
B-24C - Converted from B-24A; revised engine cowlings; Emerson A-6 power turret in tail with 2 x 12.7mm machine guns; Martin power turret in nose.
B-24D - First quantitative production model; fitted with Pratt & Whitney R-1830-43 supercharged engines; ventral gun station replaced with Bendix turret then Sperry ball turret; later models sported cheek machine guns for improved forward defense; 2,696 examples produced.
B-24E - Development of the D-model with production held by Ford Motor Company; fitted with Pratt & Whitney R-1830-65 radial piston engines; ventral gun station of early models; 801 examples produced.
XB-24F - B-24D Conversion Prototype Model to test de-icers.
B-24G - Production by North American Aviation; fitted with 3 x 12.7mm machine guns in nose; Sperry ball turret in ventral position; 405 examples produced.
B-24G-1 - Production by North American Aviation; based on B-24H; fitted with Emerson A-6 nose turret replacing earlier machine gun arrangement.
B-24H - Ford Motor Company development; fitted with Emerson A-6 turret in nose; revised airframe and bombardier compartment; revised vision from tail turret and dorsal turret; staggered waist gunners; 3,100 examples produced.
B-24J - Based on B-24H model sans armament arrangement; improved autopilot and bombsight; 6,678 examples produced.
XB-24K - Development of Ford Motor Company; B-23 Dragon empennage fused to B-24D airframe; single example converted as such.
B-24L - Lightened attempt; sans ball turret; 2 x 12.7mm machine gun arrangement in ventral gun position; M-6A turret in tail; 1,667 examples produced.
B-24M - Based on the B-24L lightning effort; lightened A-6B tail turret; uncovered waist gunner ports; revised windshield; 2,593 examples produced; last production B-24s.
XB-24N - Based on the B-24J; fitting single vertical fin tail and revised nose and tail turrets; ordered but never produced; single example.
YB-24N - Pre-production Model of XB-24N single-tail Liberator; 7 examples produced.
XB-24P - Based on the B-24D; used as test aircraft for Sperry Company; single conversion example.
XB-24Q - B-24L conversion model handled by General Electric; radar-controlled tail turret.
XB-41 - Liberator modified as a gunship for bomber escort duty; 14 x 12.7mm machine guns; bomb bay held 11,000 rounds of 12.7mm ammunition; poor performance specs forced project to be dropped' single example converted from B-24D model.
C-87 - Engineer Trainer
C-87 "Liberator Express" - 20-seat passenger transport
C-87A - VIP transport with seating for 16; fitted with Pratt & Whitney R-1830-43 or R-1830-45 series engines.
C-87B - Proposed armed passenger transport; dorsal and ventral turrets; machine guns.
C-87C - RY-3 re-designated by USAAF
RB-24L - B-29 gunnery trainer with remote turrets
TB-24L - Similar to RB-24L but with added radar equipment.
XC-109 - Prototype Tanker
C-109 - Production Tanker
XF-7 - B-24D model converted as prototype photographic reconnaissance platform.
F-7 - B-24H model converted to photographic reconnaissance platform.
F-7A - B-24J model converted to three-camera photographic reconnaissance platform.
F-7B - B-24J model converted to six-camera photographic reconnaissance platform.
BQ-8 - B-24D and B-24J models converted as radio-controlled flying bombs.
PB4Y-1 - USN designation of B-24D, G, J, L and M production models; revised nose turret.
PB4Y-1P - Photographic Reconnaissance Version of PB4Y-1.
PB4Y-2 Privateer - Single Tail Liberator Model
P5Y - Proposed PB4Y-1 with only two engines
RY-1 - USN designation of C-87A transport
RY-2 - USN designation of C-87 transport
RY-3 - USN transport version based on the PB4Y-2 Privateer.
LB-30 - USSAF armed transports built from British B.Mk II models.
LB-30A - French pre-production models; re-routed to England after fall of France via Lend-Lease; 6 examples.
LB-30B - British Lend-Lease Models of the B-24A; 20 examples (B.Mk I).
Liberator B.Mk I - British B-24A models; 20 examples delivered.
Liberator GR.1 - B.Mk I models rebuilt as anti-submarine patrol platforms.
Liberator B.Mk II - Similar to B-24C models; fitted with British equipment and armament.
Liberator B.Mk III - Based on B-24D; single 7.7mm machine gun in nose; Boulton Paul tail turret with 4 x 7.7mm machine guns; 1 x 7.7mm machine gun to each waist position; 2 x machine guns in dorsal turret.
Liberator B.Mk IIIA - Same as B.Mk III but with American armament and equipment.
Liberator B.Mk IV - Not Used
Liberator B.Mk V - B-24D model with expanded fuel capacity and less armor protection; armament suite of B.Mk III models.
Liberator B.Mk VI - B024H models; Boulton Paul turrets.
Liberator B.Mk VIII - B-24J models
Liberator GR.Mk V - RAF Coastal Command B-24D models; anti-submarine variants with searchlight and radar; optional rockets.
Liberator GR.Mk VI - B-24G, H and J models for RAF Coastal Command; reconnaissance platforms.
Liberator GR.Mk VIII - RAF Coastal Command B-24J models for anti-submarine patrol.
Liberator C.Mk VI - Transport conversion models of the B.Mk VIII.
Liberator C.Mk VII - C-87 designation
Liberator C.Mk VIII - Transport conversion models of G.Mk VIII models.
Liberator C.Mk IX - RY-3 transport designation