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Kl 25
.
Role Training plane
Manufacturer Klemm
First flight 1928
Klemm L 25 at the ILA 2006
Frontal view

Klemm L.25, later Klemm Kl 25 was a successful German light leisure and training monoplane aircraft, developed in 1928. More than 600 aircraft were built, and manufacturing licenses were sold to the United Kingdom and the United States.

With low cantilever wing, fixed landing gear, and two open cockpits,[1] the aircraft was developed by Hanns Klemm who used his previous design, the Klemm Kl 20, as a starting point. It first flew on a 20 hp (15 kW) Mercedes engine.[1] About thirty different versions of the Kl 25 were made, and these were equipped with engines ranging from 32 to 70 kW (43 to 94 hp). The fuselage was covered with plywood.

Depending on the model, the aircraft's weight was 620 to 720 kg (1,367 to 1,587 lb), and it had a 10.5 to 13 m (34 to 43 ft) wingspan. Take-off was achieved at only 50 km/h (31 mph) and the maximum speed was between 150 to 160 km/h (93 to 99 mph).

In relation to similar aircraft of the time, assembly was very easy, and this made it a very popular aircraft. According to the sales brochures, only 25% of the engine's power was needed to keep the aircraft flying, compared to biplanes of the period, which required 50% engine power.

About 600 were built in Germany between 1929 and 1936,[1] serving with various flight training organizations, on either wheels, skis, or floats.[1] Fifteen were sold to Britain before the Second World War,[1] being fitted with a variety of domestic engines,[1] while twenty-eight more were built by British Klemm Aeroplane Company as the B.A. Swallow.[1]

Contents

Versions

NB, list not complete
 Germany
L 25 a: Built between 1927 and 1929, equipped with a Daimler F 7502 engine (22 PS)
L 25 I and IW: Built between 1928 and 1929, equipped with a Salmson AD.9 engine (45 PS)
L 25 b: Built in 1931, equipped with a 22 PS Daimler engine
L 25 b VII: Built in 1931, equipped with a Hirth HM 60 engine (60 PS)
L 25 d II: Built in 1933, equipped with a Siemens Sh 13 a engine (88 PS)
L 25 d VII: Equipped with a Hirth HM 60 R engine (80 PS)
 United Kingdom
B.K. Swallow
B.A. Swallow II

Specifications (L 25 d VII R)

General characteristics

  • Length: 7.5 m ()
  • Wingspan: 13.0 m ()
  • Height: 2.05 m ()
  • Wing area: 20.0 m² ()
  • Empty weight: 420 kg ()
  • Max takeoff weight: 720 kg ()

Performance

References

Notes
  1. ^ a b c d e f g Ketley, Barry, and Rolfe, Mark. Luftwaffe Fledglings 1935-1945: Luftwaffe Training Units and their Aircraft (Aldershot, GB: Hikoki Publications, 1996), p.12.
Bibliography

See also

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