Successful testing of the Ae 02 led Vlasak and Husnik
to revise the basic design in accordance with the requirements
of the air component of the Czechoslovakian
Army and to accept the BMW IlIa six-cylinder
water-cooled engine rated at 185hp and for which a
manufacturing licence had been acquired by Walter.
Flown as the Ae 04 in 1921, the new prototype established
a national altitude record of 6361m
and was then displayed at the 2nd International Aircraft
Exhibition in Prague. Retaining the structure and
armament of the Ae 02, the Ae 04 transferred fuel tankage
to the fuselage and initially flew with an automobile-
style frontal radiator, this giving place to a chin-type
radiator during flight development. Only one prototype
of the Ae 04 was built, further development
resulting in the A18.
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