Siebel Si 202

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Si 202 Hummel
Siebel Si.202 photo L'Aerophile October 1938.jpg
Role sports and trainer
National origin Germany
Manufacturer Siebel Flugzeugwerke Halle K.G.
Designer 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[edit]

Siebel Si.202 cockpit photo from L'Aerophile July 1939

In January 1937 Major Werner Junck, chief of the LC II, the technical wing of the Reichsluftfahrtministerium responsible for the development of new aircraft, informed various minor aircraft manufacturers such as Flugzeugwerke Halle, which later in the year would become Siebel, Bücker, Fieseler, Gothaer Waggonfabrik and Klemm that they would not get any contracts for the development of military aircraft. He therefore advised them to concentrate in the development of a Volksflugzeug or a small twin-engined plane. As a result, Flugzeugwerke Halle developed the Si 202, while the other companies produced the Kl 105, the Fi 253, the Bü 180 and the Go 150.[2]

The Hummel was a small single-engined low-wing cantilever monoplane with side-by-side seating for two,[3] 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.[3][4]

The first prototype D-ESFH had a nine-cylinder radial Salmson 9Ad motor of 36 kW (45 hp).[3] For a light aircraft, there was a surprising number of prototypes (at least seven[5]), 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 31 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[5] before the start of World War II and 8 more on the Hungarian list.[6] Total production of all variants is estimated at 66.[1]

Variants[edit]

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.[7] This variant had slightly extended and noticeably rounded tips to wings and tail surfaces.

Operators[edit]

 Hungary

Specifications (Si.202A)[edit]

Data from Grey 1972, p. 166c

General characteristics

  • Crew: 2
  • Length: 6.4 m (21 ft 0 in)
  • Wingspan: 10.5 m (34 ft 5 in)
  • Height: 1.85 m (6 ft 1 in)
  • Wing area: 14 m2 (150 sq ft)
  • Empty weight: 300 kg (661 lb)
  • Gross weight: 520 kg (1,146 lb)
  • Fuel capacity: 45 l (12 US gal; 9.9 imp gal) in a forward fuselage tank
  • Powerplant: 1 × Salmson 9Ad 9-cylinder air-cooled radial piston engine, 34 kW (45 hp)
  • Propellers: 2-bladed fixed-pitch propeller

Performance

  • Maximum speed: 155 km/h (96 mph, 84 kn)
  • Cruise speed: 140 km/h (87 mph, 76 kn)
  • Service ceiling: 3,300 m (10,800 ft)
  • Absolute ceiling: 4,300 m (14,100 ft) abosl
  • Rate of climb: 8.333 m/s (1,640.4 ft/min)
  • Time to altitude: 1,000 m (3,300 ft) in 8 minutes 30 seconds
  • Wing loading: 37.1 kg/m2 (7.6 lb/sq ft)
  • Power/mass: 0.0438 hp/lb (0.0720 kW/kg)

References[edit]

  1. ^ a b c d e f "Siebel Si 202 Hummel". www.histaviation.com. Retrieved 22 May 2019.
  2. ^ "Das Archiv der Deutschen Luftwaffe : Fieseler Fi 253". www.luftarchiv.de (in German). 31 October 2011. Retrieved 22 May 2019.
  3. ^ a b c Grey 1972, p. 166c
  4. ^ "Das Archiv der Deutschen Luftwaffe : Siebel Si 202". www.luftarchiv.de (in German). 31 October 2011. Retrieved 22 May 2019.
  5. ^ a b "Civil Aircraft Register - Germany". www.airhistory.org.uk. Retrieved 22 May 2019.
  6. ^ "Civil Aircraft Register - Hungary". www.airhistory.org.uk. Retrieved 22 May 2019.
  7. ^ de:Hirth HM 515

Further reading[edit]

  • Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. ISBN 0-7153-5734-4.