Junkers CL.I (J-10)
Model Airplane News Cover Art for March, 1967
by Jo Kotula
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The Junkers CL.I was a ground-attack aircraft developed in Germany during World War I. The monoplane was a highly experimental form at the time due to concerns about structural strength. Hugo Junkers was almost "mono-maniacal" in pursuit of the monoplane dream and was apparently quite persuasive. The prototype flew in late 1917 and was followed over the next few months by three more development aircraft. German authorities were sufficiently impressed to want to order the plane, but had misgivings about Junkers' ability to manufacture the aircraft in quantity. Finally, Junkers formed a joint venture with Fokker, and the aircraft went into production in quantity.

Junkers CL.I (J-10)
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Like the other Junkers designs of the period, the aircraft featured a metal framework that was skinned with corrugated duralumin sheets. 47 examples were delivered before the Armistice, including three built as floatplanes under the designation CLS.I (factory designation J 11). After the war, one or two CL.Is were converted for commercial service by enclosing the rear cockpit under a canopy.

Here is a video of an airshow in Great Britain; at about 1:27 two Junkers CL.I (J-10) make a flyby:

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