The appearance of the construction is very reminiscent of the contemporary twin engined fighter, the Fokker G.I from Holland.

The unconventional twin-boom airplane project under Jaroslav Šlechta began in 1936 as a response to a Ministry of National Defence specification which called for the design and construction of a new reconnaissance aircraft to operate over combat zones.

The short-range reconnaissance three-seater was to be capable of monitoring activity behind enemy lines; the requirement highlighted the importance of good view from the cockpit as well as of placement of the on-board cameras, which were to be able to collect as many shots as possible at as wide an angle as possible in one flyover.

Because the reconnaissance airplane had to be able to escape enemy fighters, a high top speed was a number one priority, meaning a suitable engine had to be found.

The simple wood and welded steel-tubes frame made both assembly and maintenance easy, and operation as well.