Junkers J.I

The Junkers J.I was an all-metal biplane, an oddity in the days of wood and fabric construction. It featured armored cockpits for the crew (making it quite popular), and a corrugated metal skin that became a feature of future Junkers aircraft.

The plane has an endurance of 2 hours. It burns 7.45 gallons of aviation fuel per hour at routine usage. A full load of fuel and ammo (excluding bombs) costs $27.


Subassemblies: Light Fighter chassis +3; Heavy Fighter wings with Biplane option +2; 2 fixed wheels +0.

Powertrain: 149-kW HP gasoline engine with 149-kW old prop and 60-gallon fuel tank [Body].

Occ.: 2 XCS Body

Cargo: 9.5 Body


Armor F RL B T U

All: 2/3 2/3 2/3 2/3 2/3

Crew: 0/+20 0/+20 0/+20 0/+0 0/+20



2xAircraft LMG/7.92 mm LMG 08/15 [Body:F] (500 rounds each).*

Aircraft LMG/7.92 mm Parabellum [Body:B] (500 rounds).




Body: Casemate and high-angle mount for the rear MG.



Size: 26'x38'x10' Payload: 0.45 tons Lwt.: 2.39 tons

Volume: 144 Maint.: 68 hours Cost: $8,715

HT: 7. HPs: 50 Body, 180 each Wing, 8 each Wheel.

aSpeed: 97 aAccel: 2 aDecel: 27 aMR: 6.5 aSR: 1

Stall Speed: 41 mph. Take-Off Run 280 yards. Landing Runs 168 yards.

gSpeed: 126 gAccel: 6 gDecel: 10 gMR: 0.5 gSR: 2

Ground Pressure: Very High. 1/8 Off-Road Speed.


Design Notes:

Historical wing area was 534 sf. The fuel capacity and MG load outs are a guess based on the historical payload. Design payload was 865 lbs; the historical value has been substituted. Design aSpeed was 88 mph. Wing weight, cost and HPs were halved to lower design weight; design weight was then raised 2% to the historical. The armored station is presumed to surround both crew stations in a single box, with a single forward and rear aspect protecting both crew members equally. Performance calculations were based on historical values for wing area and loaded weight. The front Body MGs are synchronized, lowering RoF by 10% (see p. W:MP8).



The prototype J 1 (1915) featured a 112-kW powerplant. It was nicknamed the "Tin Donkey."

The J 2 (1916) was generally similar to the J 1, but armed with a single 7.92mm 08/15 machine gun (Aircraft LMG).

The J 3 was an uncompleted prototype.

The J 4 (1917) was an armored close support aircraft of similar type.


From the Aerodrome for GURPS

2008 by Jim Antonicic