[citation needed] The Hummel was a small single-engined low-wing cantilever monoplane with side-by-side seating for two,[1] designed to accept a variety of low powered engines of either radial or in-line arrangement.

Most variants had sharply clipped wing and tail surfaces, giving the Hummel an attractively angular appearance compared with its contemporaries.

[1] The first prototype D-ESFH had a nine-cylinder radial Salmson 9Ad motor of 36 kW (45 hp),[1] and began flight testing in May 1938.

The engines of the three main variants are given below; the third prototype used a 46 kW (62 hp) Walter Mikron II four-cylinder in-line air-cooled motor.

[2] On 2 February 1939 a Si 202b set a new altitude record for light aircraft carrying two people with an engine of 2 litre capacity, at 5,982 metres (19,626 ft).