Klemm L 25, later Klemm Kl 25 was a successful German light leisure, sports 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 a low cantilever wing, fixed landing gear, and two open cockpits,[1] the aircraft was developed by Hanns Klemm, who used his previous design, the Daimler L20, as a starting point. It first flew on a 20 hp (15 kW) Daimler F7502 engine.[1] About 30 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. Takeoff was achieved at only 50 km/h (31 mph) and the maximum speed was between 150 and 160 km/h (93 and 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, with either wheels, skis, or floats.[1] 15 were sold to Britain before the Second World War,[1] being fitted with a variety of domestic engines,[1] while 28 more were built by British Klemm Aeroplane Company as the B.A. Swallow.[1] Production in the United States was carried out by the Aeromarine-Klemm Company which enjoyed moderate success, as well as developing models for the American market, in isolation from the parent company, with about 120 built of all models.
Operationedit
Klemm L 25s took part in many competitions, among others in International Touring Aircraft Competitions (Europa Rundflug) in 1929 (best 4th place) and in 1930 (best 2nd and 3rd places, L 25E variant).[2]
(L 25 Ve) Special competition variant (E for Europa Rundflug 1930), with a closed canopy, smaller span, equipped with a 103 PS (101.6 hp; 75.8 kW) Argus As 8[2]
^ abcdefgKetley, Barry; Rolfe, Mark (1996). Luftwaffe fledglings 1935-1945 Luftwaffe training units & their aircraft (1st ed.). Aldershot, GB: Hikoki Publications. p. 12. ISBN978-0951989920.
^ abcKrzyżan, Marian (1988). Międzynarodowe turnieje lotnicze 1929-1934 (in Polish). Warsaw: Wydawn, Komunikacji i Łączności. pp. 216–218. ISBN83-206-0637-3.
^ abGrey, C.G., ed. (1931). Jane's All the World's Aircraft 1931. London: Sampson Low, Marston & company, ltd. pp. 172c–173c.
^Krzyżan, Marian (1988). Międzynarodowe turnieje lotnicze 1929-1934 : Table.II (in Polish). Warsaw: Wydawn, Komunikacji i Łączności. ISBN83-206-0637-3.
^Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
Bibliographyedit
Gerdessen, Frederik. "Estonian Air Power 1918 – 1945". Air Enthusiast, No. 18, April – July 1982. pp. 61–76. ISSN 0143-5450.
External linksedit
Wikimedia Commons has media related to Klemm Kl 25.
April 27, 2024
klemm, klemm, later, successful, german, light, leisure, sports, training, monoplane, aircraft, developed, 1928, more, than, aircraft, were, built, manufacturing, licenses, were, sold, united, kingdom, united, states, role, training, plane, manufacturer, klemm. Klemm L 25 later Klemm Kl 25 was a successful German light leisure sports 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 Kl 25 Role Training plane Manufacturer Klemm First flight 1928 Number built About 720 including American built aircraft Variants Klemm Kl 26 L 25E during the Europa Rundflug 1930 pilot Reinhold Poss 1934 L25 DII Contents 1 Design and construction 2 Operation 3 Variants 4 Operators 5 Specifications L 25 Ia 6 See also 7 References 8 Bibliography 9 External linksDesign and construction editWith a low cantilever wing fixed landing gear and two open cockpits 1 the aircraft was developed by Hanns Klemm who used his previous design the Daimler L20 as a starting point It first flew on a 20 hp 15 kW Daimler F7502 engine 1 About 30 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 Takeoff was achieved at only 50 km h 31 mph and the maximum speed was between 150 and 160 km h 93 and 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 with either wheels skis or floats 1 15 were sold to Britain before the Second World War 1 being fitted with a variety of domestic engines 1 while 28 more were built by British Klemm Aeroplane Company as the B A Swallow 1 Production in the United States was carried out by the Aeromarine Klemm Company which enjoyed moderate success as well as developing models for the American market in isolation from the parent company with about 120 built of all models Operation editKlemm L 25s took part in many competitions among others in International Touring Aircraft Competitions Europa Rundflug in 1929 best 4th place and in 1930 best 2nd and 3rd places L 25E variant 2 Variants editNB list not complete nbsp Germany L 25 a Built between 1927 and 1929 equipped with a 22 PS 21 7 hp 16 2 kW Daimler F 7502 engine L 25 I Built between 1928 and 1929 equipped with a 45 PS 44 4 hp 33 1 kW Salmson AD 9 engine L 25 Ia L 25 IW Floatplane version of the Ia with two wooden floats supported by steel tube struts in inverted W configuration 3 L 25 b Built in 1931 equipped with a 22 PS 21 7 hp 16 2 kW Daimler F 7502 engine L 25 b VII Built in 1931 equipped with a 60 PS 59 2 hp 44 1 kW Hirth HM 60 engine L 25 d II Built in 1933 equipped with an 88 PS 86 8 hp 64 7 kW Siemens Halske Sh 13a engine nbsp Klemm L 25 d VII R built in 1934 L 25 d VII Equipped with a 80 PS 78 9 hp 58 8 kW Hirth HM 60R engine L 25 IVa Equipped with Armstrong Siddeley Genet engine 4 VL 25 Va Three seater variant with a closed canopy equipped with 103 PS 101 6 hp 75 8 kW Argus As 8 straight engine 2 L 25 Ve see L 25E For Europa Rundflug 1930 L 25E L 25 Ve Special competition variant E for Europa Rundflug 1930 with a closed canopy smaller span equipped with a 103 PS 101 6 hp 75 8 kW Argus As 8 2 nbsp United Kingdom British Klemm Aeroplane Company B K Swallow British Aircraft Manufacturing Co B A Swallow II nbsp United States Aeromarine Klemm AKL 25 Aeromarine Klemm AKL 70 Aeromarine Klemm Model 70 TrainerOperators edit nbsp Bolivia Bolivian Air Force nbsp Hungary Royal Hungarian Air Force nbsp Peru Peruvian Air Force nbsp Romania Royal Romanian Air Force nbsp South Africa South African Air ForceSpecifications L 25 Ia editData from Jane s All the World s Aircraft 1931 3 General characteristicsCrew 1 Capacity 1 Length 7 3 m 23 ft 11 in Wingspan 13 m 42 ft 8 in Height 1 75 m 5 ft 9 in Wing area 20 0 m2 215 sq ft Airfoil Gottingen 387 5 Empty weight 285 kg 628 lb Gross weight 500 kg 1 102 lb Fuel capacity 50 L 13 US gal 11 imp gal in a forward fuselage tank Powerplant 1 Salmson AD 9 9 cylinder air cooled radial piston engine 30 kW 40 hp Propellers 2 bladed fixed pitch propeller Performance Maximum speed 140 km h 87 mph 76 kn Landing speed 50 km h 31 mph 27 kn Range 650 km 400 mi 350 nmi Service ceiling 6 500 m 21 300 ft Time to altitude 1 000 m 3 300 ft in 8 minutes Wing loading 25 kg m2 5 1 lb sq ft Power mass 0 05978 kW kg 0 03636 hp lb See also editRelated development Klemm Kl 26 Related lists List of military aircraft of GermanyReferences edit a b c d e f g Ketley Barry Rolfe Mark 1996 Luftwaffe fledglings 1935 1945 Luftwaffe training units amp their aircraft 1st ed Aldershot GB Hikoki Publications p 12 ISBN 978 0951989920 a b c Krzyzan Marian 1988 Miedzynarodowe turnieje lotnicze 1929 1934 in Polish Warsaw Wydawn Komunikacji i Lacznosci pp 216 218 ISBN 83 206 0637 3 a b Grey C G ed 1931 Jane s All the World s Aircraft 1931 London Sampson Low Marston amp company ltd pp 172c 173c Krzyzan Marian 1988 Miedzynarodowe turnieje lotnicze 1929 1934 Table II in Polish Warsaw Wydawn Komunikacji i Lacznosci ISBN 83 206 0637 3 Lednicer David The Incomplete Guide to Airfoil Usage m selig ae illinois edu Retrieved 16 April 2019 Bibliography editGerdessen Frederik Estonian Air Power 1918 1945 Air Enthusiast No 18 April July 1982 pp 61 76 ISSN 0143 5450 External links edit nbsp Wikimedia Commons has media related to Klemm Kl 25 Old Rhinebeck Aerodrome s Aeromarine Klemm AKL 26 page Retrieved from https en wikipedia org w index php title Klemm Kl 25 amp oldid 1217758508, wikipedia, wiki, book, books, library,
