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Si 202 Hummel
Role sports and trainer
National origin Germany
Manufacturer Siebel Flugzeugwerke Halle K.G.
Designed by F. Fechner
First flight May 1938[1]
Number built 66[1]

The Siebel Si.202 Hummel ("Bumble-bee") was a German light sportsplane of the late 1930s. It was an angular low-wing monoplane, which could be powered by a variety of small engines.


Design and Development

The Hummel was a small single engined low-wing cantilever monoplane with side-by-side seating for two,[2] designed to accept a variety of low powered engines of either radial or in-line arrangement. It was aimed at the sports and club market. Most variants had sharply clipped wing and tail surfaces, giving the Hummel an attractively angular appearance compared with its contemporaries.

Structurally, the Hummel was a wooden aircraft. The wing were built around a wooden monospar with plywood covered leading edges and ailerons, with fabric covering elsewhere. The fuselage was a plywood covered wooden structure, as were the fixed tail surfaces, rudder and elevators being fabric covered. The horizontal tail surfaces were set noticeably aft of the rudder, rather like the more recent Piper PA-28. The enclosed cabin had dual controls, a single central control column being shared via horizontal extensions. There was a generous baggage space behind the seats. The fixed undercarriage had main wheels on split axles, with low pressure tyres and brakes. There was a sprung tailskid.[2]

The first prototype D-ESFH had a nine cylinder radial Salmson 9Ad motor of 36 kW (45 hp)[2]. For a light aircraft, there was a surprising number of prototypes (at least seven[3]), mostly exploring different engine installations. 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.[1]

On 31st January 1939 Si.202B D-EMDR set a new altitude record for light aircraft carrying two people at 5,982 m or 19,625 ft. A few days later it set another record with just the pilot aboard, reaching 7,043 m or 23,106 ft.[1]

At least 17 Hummels, including the prototypes, appeared on the German civil list[3] before the start of World War II and 8 more on the Hungarian list[4]. Total production of all variants is estimated at 66.[1]


from [1]

  • Si.202A: 36 kW (45 hp) nine cylinder radial Salmson 9Ad
  • Si.202B: 41 kW (55 hp) four cylinder in-line air cooled Zundapp 9-092
  • Si.202C: 45 kW (60 hp) four cylinder in-line air cooled Hirth HM 515[5]. This variant had slightly extended and noticeably rounded tips to wings and tail surfaces.

Specifications (Si.202A)

Data from Grey 1972, p. 166c

General characteristics

  • Crew: 2
  • Length: 6.4 m (21 ft 9 in)
  • Wingspan: 10.5 m (34 ft 5 in)
  • Height: 1.85 m (6 ft 1 in)
  • Wing area: 14.0 m² (151 ft²)
  • Empty weight: 300 kg (660 lb)
  • Gross weight: 520 kg (484 lb)
  • Powerplant: 1 × nine cylinder radial Salmson 9Ad, 34 kW (45 hp) each


  • Maximum speed: 155 km/h (96 mph)
  • Cruising speed: 140 km/h (87 mph)
  • Service ceiling: absolute 4,300 m (14,100 ft)
  • Rate of climb: to 1000 m (3,28 ft) 2 m/s (386 ft/min)




Cited sources

  • Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. ISBN 0715 35734 4.  


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