FW 190 A4/U4 Recon is a German Air unit added in Back to Hell.
Although the Messerschmitt Bf 109 fighter was a powerful fighter, Reich authorities were concerned that future designs might outclass it. The eventual winner of the competition, Focke-Wulf Fw 190 Würger (Shrike) was a single-seat, single-engine fighter designed by Kurt Tank in 1937. A veteran of World War I, Tank saw the punishment military equipment endured in the field and envisioned a plane that would not be a racehorse, like the Bf 109 and Spitfire, but a Dienstpferd, a rugged, powerful war mount.
His design was exactly that: Fast, well armored and armed, forgiving of mistakes, and capable of operating in the most adverse of conditions. It eschewed hydraulics in favor of the more reliable electric operation for most of the Fw 190's system, a system of pushrods and bearings instead of cables for controls, ensuring consistent operation, and generally increasing the pilot's comfort by reducing trim maintenance requirements and introducing a vacuum-formed bubble canopy that increased visibility. The end result was a powerful fighter that outperformed all contemporary aircraft at the time of its introduction in 1941. Together with the Bf 109, it became the backbone of the Jagdwaffe, Luftwaffe's fighter forces, adapted for a multitude of roles - day fighter, fighter-bomber, ground-attack plane, night fighter - and served until the end of the war.
The A-4 was equipped with BMW 801 D-2 engine, which increased power to 1,700 PS (1,677 hp, 1,250 kW) at takeoff, an armament included two fuselage-mounted 7.92 mm (.312 in) MG 17s and two wing root-mounted 20 mm MG 151/20E cannon and two outboard wing-mounted 20 mm MG FF/Ms.
The U4 is the reconnaissance fighter of the FW 190 A4 subvariant. A4 got MW 50" water-methanol power boost system for the BMW 801 engine. This allowed the pilot to raised engine's redline limit for a short period of time. FW 190 A4/U4 had two cameras in the rear fuselage with two MG 17 guns in the cowling.