AEG G.IV

Allgemeine Elektricitäts-Gesellschaft (A.E.G.)

Industry	Electrical equipment, aircraft manufacturing
Headquarters	Germany
Products	AEG G.IV bomber aircraft

Template:Infobox aircraft

The AEG G.IV was a German-designed biplane bomber developed and manufactured by Allgemeine Elektricitäts-Gesellschaft (A.E.G.). It was deployed operationally by the Luftstreitkräfte during the First World War.

Building upon the earlier AEG G.III, the G.IV incorporated enhancements in engine power, bomb capacity, and overall dimensions; notably, its bomb load was twice that of the preceding AEG G.II. Entering service in late 1916, the aircraft successfully undertook both reconnaissance and bombing missions. Due to its limited operational range, it primarily functioned as a tactical bomber near frontline zones. Initially employed for both daytime and nighttime raids across France, Romania, Greece, and Italy, its use gradually shifted towards nocturnal sorties as the war advanced. Many of these night missions were nuisance raids aimed at disrupting enemy operations without targeting specific objectives, often resulting in incidental damage.

Some military authorities deemed the G.IV’s offensive capabilities and performance insufficient, prompting efforts to enhance its design. One specialized variant, the G.IVk (Kanone), was modified into an armored anti-tank gunship equipped with two 20 mm Becker cannons; however, it never saw combat. The G.IV marked the final model of this series to be operational, as although development of the improved G.V continued, it did not enter service before the 1918 Armistice concluded hostilities.

Design and development

The Allgemeine Elektricitäts-Gesellschaft (A.E.G.) G.IV was an evolution of the preceding G.III, representing only minor refinements according to aviation experts Peter Gray and Owen Thetford. Engineered primarily for tactical bombing roles, the design incorporated several advanced features for its time, including onboard radio communication equipment and electrically heated flight suits for crew comfort.

Distinct from other German twin-engine Großflugzeug ("G") class bombers such as the Gotha G.V and Friedrichshafen G.III, the G.IV utilized a fully welded metal tube frame which significantly enhanced structural durability compared to contemporaries. This construction approach resulted in a relatively heavy airframe despite its compact size among twin-engine designs. The fuselage was built as a single integrated unit rather than assembled from smaller sections, with steel tubing also employed in the tail assembly. Apart from plywood panels on the nose section, fabric covered most external surfaces. The tail featured an unusually tall rudder requiring unique bracing to the upper longeron; additionally, the tail fins exhibited a high camber design atypical for the period.

File:216 1 un gotha à terre.jpg

An AEG G.IV after crashing on December 23, 1917

Propulsion came from two six-cylinder water-cooled inline Mercedes D.IVa engines, cooled by automotive-style radiators located just behind each propeller. These powerplants were mounted on steel struts attached to the lower wing spars and braced against the fuselage’s upper longerons; notably, no struts connected them to the upper wing structure. The wings consisted of a fixed central section with detachable swept outer panels constructed from paired 50 mm diameter steel tube spars combined with solid wooden ribs. To reduce weight, holes were drilled in strategic locations within the wing structure; ribs were loosely threaded rather than rigidly fixed to spars, with some ribs serving only as false members. Large balanced ailerons on the upper wings shared profiles similar to those on the AEG C.IV. The undercarriage included a robust tailskid plus two wheels positioned beneath each engine mount, each fitted with shock absorbers.

Armament-wise, the G.IV could carry up to approximately 400 kg (880 lb) of bombs. Bomb racks along tracks were installed on the port side of the rear cockpit for carrying twenty-five-pound bombs; an additional rack was located beneath the floor between cockpits for extra ordnance storage. Provision existed for up to five fifty-pound bombs—one beneath each wing and up to three under the fuselage. Bomb release controls were operated from the forward cockpit position. Typically staffed by three crew members, a fourth could be accommodated when necessary. Positioned atop the fuselage was the rear gunner’s cockpit featuring a hinged floor window designed for observation and defense against pursuing fighters. Dual flight controls could be installed when required (excluding aileron controls), although this feature was mainly reserved for emergency situations.

Experimental variants included an extended-span version with three-bay wings known as the G.IVb. Additionally, an armored anti-tank gunship iteration designated G.IVk (Kanone) armed with two 20 mm Becker cannons was developed but reportedly never entered operational service.

Operational history

File:AEG GIV british.jpg

A captured AEG G.IVk bearing British insignia, Bickendorf, 1919

The G.IV was introduced into service with the German Air Force towards the end of 1916. From the outset, it lagged behind contemporary Gotha bombers in several key performance areas, including operational range and bomb load, despite commonly being powered by the same Mercedes D.IVa engine. Nevertheless, the G.IV was generally considered easier to pilot compared to Gothas, which were often challenging for their crews to manage. Given its relatively limited payload when fully fueled, missions assigned to the G.IV tended to be short-range, allowing for an increased bomb load by reducing fuel carried. Occasionally, the aircraft was deployed without armament for conducting aerial reconnaissance tasks.

The G.IV executed bombing sorties during both daylight and nighttime hours, frequently focusing on targets situated behind enemy lines. On the Italian front, some crews from Kampfgeschwader 4 reportedly completed as many as seven combat missions per night. One remarkable operation involved a G.IV piloted by Hauptmann Hermann Köhl, which targeted railway facilities in Padua, Italy.

By August 1918, approximately 50 of these aircraft were still active within the German Air Force. The G.IV remained in operational use until the Armistice of 11 November 1918, which brought an end to hostilities.

Survivor

File:AEG GIV CASM 2012 1.jpg

AEG G.IV displayed at the Canada Aviation and Space Museum

Only one example (serial number 574/18) survives today and is housed at the Canada Aviation and Space Museum. This aircraft holds particular importance as not only the sole surviving model of its type but also as the only preserved German twin-engine combat plane from World War I. It was transported to Canada in 1919 as a war trophy and has been part of the museum's collection since 1970.

Variants

AEG G.IV

Tactical bomber version

AEG G.IVg

Equipped with an extended three-bay wing.

AEG G.IVk

Armored ground-attack variant armed with two 20 mm Becker cannons—one mounted dorsally and another in a turret beneath the nose. Five units produced.

Operators

Template:Country data German Empire

• Luftstreitkräfte

External links

• Plan 1919
• A.E.G. G.IV