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AEG C.IV 
Designed by Georg König and a little larger than the C.III, the C.IV was a conventional biplane which introduced the D.III engine, a fixed forward firing machine gun for the pilot, and a three position variable incidence tailplane (ground adjustable). The wings featured and equal span upper and lower wing assembly with double bays and parallel struts. The wing main structure was welded steel tube, including main spars of 40mm tubes, with wooden ribs which were fabric covered.
The engine, a single Mercedes D.III water-cooled in-line type of 160 horsepower - was mounted in the extreme forward portion of the fuselage with the distinct radiator "horn" protruding the top. The engine powered a two-blade wooden propeller. The forward portion of the fuselage was contoured to an extent, producing a somewhat aerodynamic look while the rest of the body maintained a boxy-like appearance. The fuselage was a primary box structure of welded steel tube decked on top with plywood and covered at the sides and bottom with fabric.
 Seating was for two, made up of the pilot and an observer in tandem, with the pilot in the forward cockpit behind a simplistic windscreen. The pilot had access to a single Spandau machine gun offset to his right side. The system was synchronized to fire through the spinning propeller blades without damaging them via an interrupter gear. The observer manned the rear cockpit, facing aft, and sat inside of a Schneider-type gun mount ring. His position was dominated by a Parabellum machine gun with adequate traverse to engage trailing enemy fighters. The J.1 version carried an extra machine gun firing backward and downwards at 45 degrees.
Over 900 lb of armour plate protected the crew and other vital parts.
The undercarriage remained fixed, characterized by the two large main landing gears at front and a simple tail skid under the tail section. The empennage featured a sharp-angled vertical tail fin with low-mounted horizontal stabilizers.
Performance was good for the time with the C.IV yielding a top speed of 98 miles per hour with a service ceiling of 16,404 feet. Endurance from the Mercedes engine was reported to be roughly 3 hours of flight time. 
C.IV
Engine: Mercedes D.III 6 cyl inline, 160hp Wing span: 44 ft 1.5 in / 13.45m Wing span: 44.16ft (13.46m) Length: 23.46ft (7.15m) Height: 10 ft 11.75 in / 3.35m Wing area: 419.81 sq.ft / 39 sq.m Empty wt: 1764 lb / 800 kg MTOW: 2469 lb / 1120 kg Max speed: 98 mph / 158 kph / 85kt Cruise speed: 87 mph / 140 kph Climb rate: 6 min to 3280 ft (1000m) Service ceiling: 16,405ft / 5,000m Endurance: 4 hr Max range: 348 sm / 560 km Seats: 2 Armament: 1 x fixed 0.312 in (7.92mm) LMG 08/15, 1 x trainable 0.312 in (7.92mm) LMG 14 Parabellum mg. C.IVa
Engine: Argus inline, 180 hp C.IV-N
Engine: Benz Bz.III, 150 hp Wing span: 15.3m. Bomb load: 6 x 110 lb (50 kg) bombs.
 C.IV-N
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