The A-26C was originally put in production in parallel with the solid-nosed B in both the Long Beach and Tulsa plants. It was soon concluded that this was an inefficient arrangement, and at the end of 1943 the decision was made that the C-version would be built exclusively at Tulsa and the B-version exclusively at Long Beach. As it turned out, only five A-26Cs actually left the Long Beach production line before production of the C terminated there.
The modifications introduced on the A-26B production line were also introduced on the A-26C line. The clamshell canopy appeared beginning with the A-26C-30-DT block. The water-injected R-2800-79 engines wing panels with internally-mounted guns, increased tank capacity, and provision for underwing rockets were introduced on the production line with the A-26C-45-DT block.
A total of 1091 A-26Cs were built. 1086 of them were built by Tulsa (A-26C-16-DT to A-26B-55-DT) and only 5 by Long Beach (A-26C-1-DL and A-26C-2-DL). Invader production ended at Tulsa in August of 1945, when the end of the war brought the cancellation of all further A-26C contracts.
The A-26B and A-26C were essentially identical except for their noses. An A-26B could be fairly easily transformed in the field into an A-26C in a matter of a few hours, and vice versa. These conversions were actually quite common, and, for example, when an A-26B was refitted with a A-26C nose, it was officially redesignated as A-26C. A similar redesignation took place when A-26Cs were fitted with B-26B noses.
In June of 1948, the A-26C was redesignated B-26C. There was no danger of confusion with the Martin B-26 Marauder, since that aircraft was by that time out of service.
The entrance and exit from the A-26C were much the same as they were for the solid-nosed A-26B version, but the presence of the bombardier position in the transparent nose made for some differences. The navigator/bombardier could enter the nose via a door installed underneath the nose with a built-in pull-down ladder. However, there was a narrow tunnel that led from the nose to the right-hand side of the cockpit, and the bombardier/navigator could sit on a rudimentary seat to the right of the pilot, and could move in flight into the transparent nose when needed. In the event of an inflight emergency, the bombardier/navigator sitting in the nose could jettison the undernose hatch and simply drop out of the plane.
There were both single- and dual-control A-26Cs built. In the dual-control version,
there were instruments and a set of flight controls installed in front of the
right hand seat position, whereas in the single-control version there was only
a seat present. The copilot seated in this position
could do everything that the pilot could do, with the exception of bomb release
(the bomb release switches were on the pilot's side and could be reached by the
copilot only by unstrapping and reaching over the pilot). There was a problem in
that the presence
of the copilot's position in the dual-control A-26 generally made it impossible for the
bombardier/navigator to move in or out of the nose while in flight. However, in an emergency, there
was a pin that could be pulled out of the right-hand
control column so that it could be pulled aside, freeing up entrance to the tunnel.
In the single-control version, these same instruments were installed on a panel
running at a right angle to the other instruments and jutting back a bit so that
the pilot could see them and so that there was more room to get in and out of the tunnel. To the rear of the navigator/bombardier's seat was a jump seat that could be used by an extra crewman who was going along for a ride. Typically, the right-hand seat was occupied either by a co-pilot, a navigator, or a flight engineer, so transparent-nosed A-26Cs with dual controls usually carried four crew memembers.
41-39152 Douglas A-26C-1-DL Invader c/n 6865 41-39193 Douglas A-26C-2-DL Invader c/n 6906 41-39195 Douglas A-26C-2-DL Invader c/n 6908 41-39199/39200 Douglas A-26C-2-DL Invader c/n 6912/6913 43-22304 Douglas A-26C-16-DT Invader c/n 18451 43-22308/22312 Douglas A-26C-16-DT Invader c/n 18455/18459 43-22346/22349 Douglas A-26C-16-DT Invader c/n 18493/18496 43-22467/22493 Douglas A-26C-15-DT Invader c/n 18614/18640 43-22494/22564 Douglas A-26C-20-DT Invader c/n 18641/18711 43-22565/22751 Douglas A-26C-25-DT Invader c/n 18712/18898 44-35198/35357 Douglas A-26C-30-DT Invader c/n 28477/28636 44-35358/35557 Douglas A-26C-35-DT Invader c/n 28637/28836 44-35558/35562 Douglas A-26C-40-DT Invader c/n 28837/28841 44-35564/35655 Douglas A-26C-40-DT Invader c/n 28843/28934 44-35656/35782 Douglas A-26C-45-DT Invader c/n 28935/29061 44-35783/35937 Douglas A-26C-50-DT Invader c/n 29062/29216 44-35938/35947 Douglas A-26C-55-DT Invader c/n 29217/29226 44-35953 Douglas A-26C-55-DT Invader c/n 29232 44-35955 Douglas A-26C-55-DT Invader c/n 29234 44-35957/35996 Douglas A-26C-55-DT Invader c/n 29236/29275
Engines: Two Pratt & Whitney R-2800-27 or -71 air-cooled radials, each rated at
Performance: Maximum speed 355 mph at 15,000 feet. Cruising speed
284 mph. An altitude of 10,000 feet could be attained in 8.0 minutes.
Service ceiling 22,100 feet. Normal range 1400 miles, Maximum range
Dimensions: Wingspan 70 feet 0 inches, length 51 feet 3 inches,
height 18 feet 6 inches, wing area 540 square feet.
Weights: 22,850 pounds empty, 27,600 pounds loaded, 35,000 pounds
Armament: Two forward-firing 0.50-inch machine guns in nose. Two
0.50-inch machine guns in remotely-controlled dorsal turret. Two
0.50-inch machine guns in remotely-controlled ventral turret. An
internal bomb load of 4000 pounds could be carried Maximum total bomb
load of 6000 pounds.