Military Factory logo
Icon of F-15 Eagle military combat fighter aircraft
Icon of Abrams Main Battle Tank
Icon of navy warships
Icon of AK-47 assault rifle


Triplane Fighter Prototype Aircraft

A single, poorly-performing prototype was all that was realized of the AEG Dr.I triplane fighter project during World War 1.
Authored By: Staff Writer | Edited: 7/31/2019
National Flag Graphic


Year: 1917
Status: Cancelled
Manufacturer(s): Allgemeine Elektricitats-Gesellschaft AG (AEG) - Imperial Germany
Production: 1
Capabilities: Fighter; X-Plane;
Crew: 1
Length: 20.01 ft (6.1 m)
Width: 27.89 ft (8.5 m)
Height: 8.69 ft (2.65 m)
Weight (Empty): 1,510 lb (685 kg)
Weight (MTOW): 2,072 lb (940 kg)
Power: 1 x Daimler D.IIIa 6-cylinder water-cooled inline piston engine developing 170 horsepower and driving a two-bladed propeller at the nose.
Speed: 106 mph (170 kph; 92 kts)
Ceiling: 15,092 feet (4,600 m; 2.86 miles)
Range: 286 miles (460 km; 248 nm)
Rate-of-Climb: 1,300 ft/min (396 m/min)
Operators: German Empire (cancelled)
The end of the D.I biplane fighter for AEG did not mark the end of work on the series. The design was evolved into a triplane form as the Dr.I. The triplane made its mark through several notable designs put forth by the Allies and the Germans and advantages included maximized control due to the increase in lift and drag. Such fighters held a short-lived mastery of the skies for designs ultimately reverted back to biplane types. Nevertheless, just about every major aircraft firm attempted a three-winged (or more) design before the end of the war.

Development of the Dr.I originated from a review of a captured British Sopwith Triplane fighter during July of 1917. This possessed the Germans to develop something of equal capability lest they be outdone in the air by their long-time enemy. In October of 1917, AEG attempted just that and took their ultimately-abandoned D.I biplane and added a third wing member between the existing upper and lower sections. The aircraft retained the fuselage, tail unit and armament suite (2 x 7.92mm machine guns) of the D.I as well as the wheeled tail-dragger undercarriage. Power was derived from a Daimler D.IIIa 6-cylinder water-cooled inline piston engine of 170 horsepower.

Despite the third wing element, the Dr.I showcased poor handling and the added drag reduced performance of an already poor-performing fighter (maximum speed was 106 miles per hour). As quickly as the Dr.I appeared, it was abandoned as no interest in the type had formed.

The war would progress without it.


2 x 7.92mm LMG 08/15 machine guns synchronized to fire through the spinning propeller blades.

Graphical image of an aircraft medium machine gun

Variants / Models

• Dr.I - Base Series Designation; single prototype completed.
Site Disclaimer  |  Privacy Policy  |  Cookies  |  Site Map Site content ©2003-, All Rights Reserved.

The "Military Factory" name and logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT

Part of a network of sites that includes, GlobalFirepower, a data-driven property used in ranking the top military powers of the world, and, the World Directory of Modern Military Aircraft.

Facebook Logo YouTube Logo