O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
This experimental single-seat triplane appeared early in 1918. It featured dural tubular wing spars and the aluminium-sheel-covered fuselage was also armoured. It was from this aircraft the later DJ I stemmed. It is certain a vee-eight-type motor was fitted, probably the 195 h.p. Benz Bz IIIb as in the DJ I. Span, 11.2 m. (36 ft. 9 in.). Length, 6.6 m. (21 ft. 7 7/8 in.). Weights: Empty, 1,182kg.(2,600 lb.). Loaded, 1,412kg.(3,106 lb.). Speed, 166 km.hr. (103.75 m.p.h.). Climb, 1,000 m. (3,280 ft.) in 5.8 min. Armament, two Spandau machine-guns firing forward and four small bombs.
W.Green, G.Swanborough The Complete Book of Fighters
A.E.G. PE Germany
The PE (Panzer-Einsitzer) was a single-seat armoured ground attack fighter and proved to be unique among aircraft designed for this task in being of triplane configuration. Featuring an armoured light alloy-covered fuselage and fabric-covered dural wings, the PE was powered by a 195 hp Benz Bz IIIb eight-cylinder water-cooled engine and was first flown in March 1918. Armament consisted of two synchronised 7,92-mm LMG 08/15 machine guns supplemented by racks for small bombs. The PE proved easy to fly but was found to have poor stability and was considered by the Idflieg (Inspektion der Fliegertruppe) to possess inadequate performance for fighter-versus-fighter combat, a dedicated ground attack aircraft being considered unacceptable. Nonetheless, A.E.G. was to persist with the concept with the DJ.
Max speed, 103 mph (166 km/h).
Time to 3,280 ft (1000 m), 5.8 min.
Empty weight, 2,606 lb (1182 kg).
Loaded weight, 3.113 lb (1412 kg).
Span, 36 ft 8 7/8 in (11,20 m).
Length, 21ft 7 7/8 in (6,60 m).
J.Herris AEG Aircraft of WWI (A Centennial Perspective on Great War Airplanes 16)
AEG DJ.I Triplane
Exactly when the idea of an armored, single-seat fighter to oppose Allied ground-attack aircraft was proposed is not known. Surely the concept was another inspiration of Oberst-Leutnant Wilhelm Siegert, the commander of Idflieg, who throughout the war remained a steadfast proponent of specialized aircraft to fulfill specific tactical assignments. He had no use for general-purpose aircraft. It was reported on 21 October 1917 that AEG was designing an armored fighter, known internally as the AEG PE (Panzer-Einsitzer) and may have been later designated DJ.I or DA.I. (In late 1918, two aircraft classifications appeared in various records, both signifying the armored single-seat fighter. They were DJ = D-Infantrie and DA = D-Angriff (attack). It is not known if these classifications were officially adopted.) The engine, fuel, and pilot were protected by a steel shell forming an integral part of the airframe. The rear fuselage was of aluminum. The triplane wings had AEG's customary steel-tube spars and wooden ribs.
The preliminary trials of the AEG PE triplane, powered by a 195 hp Benz Bz.IIIb V-8 engine, were expected to be concluded in December 1917. From a report dated March 1918, we learn that the AEG Panzer-Einsitzer had reached 4000 meters (13,123 ft.) in 48 minutes. The test pilot reported the triplane as easy to fly but not particularly fast. Work on the AEG DJ.I triplane was stopped in May 1918 because of "poor flight characteristics."
AEG Armored Aircraft Specifications
AEG J.I AEG J.II AEG DJ.I Triplane AEG DJ.I Biplane AEG G.IVk
Engine 200 hp Benz Bz.IV 200 hp Benz Bz.IV 195 hp Benz Bz.IIIb V-8 195 hp Benz Bz.IIIb V-8 Two 260 hp Mercedes D.IVa
Span, Upper 13.00m 13.00m 11.20 m 10.00 m 18.00 m
Span, Lower 12.48m 12.48m 10.00 m 9.90 m 17.50 m
Chord, Upper 1.65m/1.85m 1.85m 1.475 m 1.80 m 2.40 m
Chord, Lower 1.65m/1.85m 1.85m 0.825 m 1.60 m 2.40 m
Gap 1.95m 1.95m 1.00 m 2.00 m 2.60 m
Wing Area 39.0 m2/43.6 m2 43.6 m2 31.3 m2 30.5 m2 65 m2
Length 7.20m 7.86m - 6.90 m 9.00 m
Height 3.3m 3.3m - - -
Track 2.19m 2.15m 1.90 m 1.90 m 4.80 m
Empty Weight 1,456 kg 1,480 kg 1,182 kg 1,185 kg 2,700 kg
Loaded Weight 1,876 kg 1,900 kg 1,412 kg 1,375 kg 3,150 kg
Maximum Speed 140 km/h 140 km/h 166 kmh 180 kmh 150 kmh
Climb to 1,000m 6.1 minutes 6 minutes 5.8 minutes 4 minutes 9 minutes
Climb to 2,000m 15.9 minutes 14 minutes - - -
Climb to 3,000m 31.6 minutes 30 minutes - - -
Climb to 4,000m - - 48 minutes - -
Armament 1 flexible machine gun, some had 2 fixed machine guns 1 flexible machine gun, 2 fixed machine guns 2 fixed machine guns, 4 small bombs 2 fixed machine guns, 4 small bombs 2 flexible machine guns, 2 flexible 20mm Becker cannon, small bombs
1. AEG J.I specs are shown as early/late; later production AEG J.I aircraft had 1.85m chord and wing area of 43.6 m2. AEG J.I dihedral = 2°
2. At least 20 J.II aircraft fitted with a flexible 20mm Becker cannon in place of the 2 fixed machine guns.
3. The middle wing of the AEG DJ.I Triplane had a span of 10.60 m and a chord of 0.825 m.