How much armor did the AEG J.I carry?

Short answer

The armor of the AEG J.I was about 5.1 mm thick and extended from the aircraft's nose to somewhat behind the rear cockpit. It added about 860 pounds (lb) of weight, offset by a more powerful engine: the Benz Bz IV, instead of the 160 hp Mercedes D.III of the AEG C.IV from which it was derived.

Published: October 30, 2026 · Updated: October 30, 2026 · Edited by Above Ten Thousand · Editorial policy

Hawker Hurricane Mk. IIC

An armored shell from nose to tail

The armor of the AEG J.I was not a simple local shield, but an envelope covering the aircraft from the nose to a point somewhat behind the rear cockpit. Its thickness was around 5.1 mm, so the protection covered both the engine and front area and the two crew positions. That extent is key to understanding the aircraft: it was not about protecting a specific component, but about armoring the section of the fuselage where the crew and powerplant were located.

The cost in pounds and the response in power

So much steel plate has an immediate consequence: the armor assembly added approximately 860 pounds (lb) of extra weight. To absorb that, the J.I used the more powerful Benz Bz IV inline piston engine, which helped offset that load. The starting point was a considerably lighter and less heavily built aircraft: the J.I is a mission-specific derivative of the AEG C.IV reconnaissance aircraft, which was powered by a single six-cylinder inline Mercedes D.III capable of delivering up to 160 hp.

From reconnaissance to ground attack

That lineage explains the formula. The C.IV was a prolific design — about 687 were built, and the model remained in service until the end of the conflict — and it was on that already proven airframe that the armored version was built. Armor of 5.1 mm from the nose, around 860 extra pounds on the scale, and a larger engine to carry it: the J.I is, in essence, a C.IV fitted with a shell and the power needed to keep flying with it.