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The Douglas CB-26 was a postwar transport and cargo adaptation of the A-26 Invader series, designed to support the United States Air Force with a light transport aircraft capable of carrying personnel, equipment, and light cargo. Its development reflected the Air Force’s need to utilize the robust, reliable Invader airframe for non-combat roles in the immediate postwar period, particularly for logistical support and rapid personnel movement. The “CB” designation stood for Cargo Bomber, indicating its conversion from a light attack/bomber to a transport-focused variant.

Development and Role
The CB-26 emerged from the practical need to repurpose surplus A-26 airframes for peacetime missions while maintaining operational versatility. Engineers modified the fuselage to accommodate cargo and personnel, including reinforced flooring, larger doors for loading, and internal fittings for seating or cargo restraint systems. While retaining twin engines and good performance characteristics, the CB-26 was optimized for short- to medium-range transport missions, often supporting bases, training units, or forward-operating detachments.

Its role included:

• Rapid personnel transport between airfields and operational areas

• Light cargo delivery, including spare parts, medical supplies, or small equipment

• Utility missions, including courier duties and liaison flights

• Occasional training missions for transport crews transitioning to larger aircraft

By adapting the Invader’s proven airframe, the CB-26 offered a versatile and economical solution for postwar Air Force logistical requirements.

Powerplant and Enhancements
The CB-26 retained the two Pratt & Whitney R-2800 Double Wasp radial engines, each producing 2,000 horsepower, providing ample performance for short- and medium-haul transport operations. Enhancements included:

• Reinforced fuselage structure to support cargo loads and seating arrangements

• Enlarged cargo doors and access points for easier loading and unloading

• Modified internal fittings, including benches or tie-down points for cargo

• Reduced or deactivated defensive armament, as combat was no longer a priority

• Optional instrumentation for navigation and communication in transport missions

These improvements allowed the CB-26 to safely and efficiently carry personnel and equipment while retaining excellent reliability and handling.

Armament and Equipment
Most CB-26 aircraft had all defensive armament removed, reflecting its transport and utility role. Internal space was repurposed to maximize cargo capacity and seating, while some aircraft were equipped with basic radios and navigation aids to support operational requirements. Bomb bays were sometimes left empty or adapted for cargo storage, and underwing pylons were generally removed to reduce weight and simplify maintenance.

Operational Context
The CB-26 served primarily in postwar Air Force support units, transporting personnel, supplies, and equipment across domestic bases and forward locations. It provided a flexible platform for logistical operations, ensuring timely delivery of critical materials and maintaining mobility in peacetime and training contexts. While not intended for combat, the CB-26 filled an essential utility and support role that extended the operational life of the Invader series.

Crew Experience
Crews found the CB-26 reliable, stable, and relatively easy to operate, with good visibility and predictable flight characteristics. Pilots appreciated the twin-engine reliability and straightforward handling, while loadmasters or personnel on board benefited from the spacious and accessible cabin layout. Its robust design allowed repeated short flights and frequent loading/unloading cycles without undue strain on the airframe or engines. Overall, it was considered a practical and efficient transport aircraft for light logistical missions.

Conclusion
The Douglas CB-26 exemplifies the adaptability of the Invader airframe, transitioning from combat-focused operations to utility and transport roles. By reinforcing the fuselage, modifying internal layouts, and optimizing for cargo and personnel carriage, the CB-26 provided a versatile, reliable, and economical solution for postwar Air Force transport needs, demonstrating the continued utility of the A-26 design well beyond its original combat purpose.