Klemm Kl 25

Kl 25

Role	Training plane
Manufacturer	Klemm
First flight	1928

L 25E during the Europa Rundflug 1930 (pilot Reinhold Poss)

1934 L25-DII

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.

Design and construction

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] 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

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]

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, Ia 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)

Klemm L.25 d VII R built in 1934

L 25 d VII: Equipped with a Hirth HM 60 R engine (80 PS)

L 25 IVa: Equipped with Armstrong Siddeley Genet engine^[3]

L 25E or Ve: Special competition variant (E for Europa Rundflug 1930), with a closed canopy, smaller span, equipped with Argus As 8 straight engine (103 PS / 75.7 kW)^[4]

VL 25 Va: Three-seater variant, with a closed canopy, equipped with Argus As 8 straight engine (103 PS / 75.7 kW)^[5]

United Kingdom: British Klemm Aeroplane Company B.K. Swallow; British Aircraft Manufacturing Co. B.A. Swallow II

United States

AKL-26A displayed at the Rhinebeck Aerodrome Museum in New York State

Aeromarine-Klemm AKL-25

Aeromarine-Klemm AKL-26

Aeromarine-Klemm AKL-27

Aeromarine-Klemm AKL-60

Aeromarine-Klemm AKL-70

Aeromarine-Klemm Model 70 Trainer

Operators

Bolivia

Bolivian Air Force

Hungary

Royal Hungarian Air Force

Peru

Peruvian Air Force

Romania

Royal Romanian Air Force

South Africa

South African Air Force

Specifications (L 25 d VII R)

General characteristics

Length: 7.5 m (24 ft 7 in)
Wingspan: 13.0 m (42 ft 8 in)
Height: 2.05 m (6 ft 9 in)
Wing area: 20.0 m² (215 sq ft)
Empty weight: 420 kg (926 lb)
Max. takeoff weight: 720 kg (1,587 lb)

Performance

Maximum speed: 160 km/h (99 mph, 86 kn)
Range: 650 km (404 mi)
Service ceiling: 4,800 m (15,748 ft)

References

Wikimedia Commons has media related to Klemm Kl 25.

Notes

1 2 3 4 5 6 7 Ketley, Barry, and Rolfe, Mark. Luftwaffe Fledglings 1935-1945: Luftwaffe Training Units and their Aircraft (Aldershot, GB: Hikoki Publications, 1996), p.12.
↑ Krzyżan, M., op.cit.
↑ Krzyżan, Marian. Międzynarodowe turnieje lotnicze 1929-1934 [International aviation competitions 1929-1934], Warsaw 1988, ISBN 83-206-0637-3, table II
↑ Krzyżan, M., op.cit., p.218
↑ Krzyżan, M., op.cit., p.216

Bibliography

External links

Old Rhinebeck Aerodrome's Aeromarine-Klemm AKL-26 page

Aircraft produced by Klemm

L20 Kl 25 Kl 26 Kl 31 Kl 32 Kl 33 Kl 35 Kl 36 Kl 105 Kl 106 Kl 107 Kl 151 Kl 152 Alpha

Reich Air Ministry aircraft designations

1 to 100	B 9 Gö 9 Do 10 Do 11 Wn 11 Do 12 Do 13 Do 14 Do 15 Wn 15 Do 16 Wn 16 Do 17 Do 18 Do 19 Do 20 Do 22 Do 23 Do 24 Kl 25 Do 26 Kl 26 M 27 Do 29 Kl 31 Kl 32 W 33 L 33 W 34 Kl 35 Kl 36 HD 37 HD 38 G 38 DFS 39 BV 40 DFS 40 A 40 Fw 42 He 42 Fw 43 HD 43 Fw 44 He 45 He 46 Ju 46 Fw 47 Ju 47 K 47 A 48 He 49 Ju 49 He 50 A 50 He 51 K 51 Ju 52 K 53 NR 54 Fw 55 NR 55 Fw 56 Fw 57 Fw 58 He 58 He 59 He 60 Ju 60 Fw 61 He 61 Fw 62 He 62 He 63 Ar 64 He 64 Ar 65 He 65 Ar 66 He 66 Ar 67 Ar 68 Ar 69 He 70 He 71 He 72 He 74 Ar 76 Ar 77 Ar 79 Ar 80 Ar 81 Ju 85 Ju 86 Ju 87 Ju 88 Ju 89 Ju 90 Ar 95 Ar 96 Fi 97 Fi 98 Fi 99 He 100

101 to 200	Al 101 Al 102 Al 103 Fi 103 Fh 104 Kl 105 Kl 106 Kl 107 Bf 108 Bf 109 Bf 110 He 111 He 112 He 113 He 114 He 115 He 116 Hs 117 He 118 He 119 He 120 Hs 121 Hs 122 Hs 123 Hs 124 Hs 125 Hs 126 Hs 127 Hs 128 Hs 129 Hs 130 Bü 131 Hs 132 Bü 133 Bü 134 Ha 135 Ha 136 Hü 136 Ha 137 BV 138 Ha 139 Ha 140 BV 141 BV 142 BV 143 BV 144 Go 145 Go 146 Go 147 Ju 147 Go 149 Go 150 Kl 151 Ta 152 Kl 152 Ta 153 Ta 154 BV 155 Fi 156 Fi 157 Fi 158 Fw 159 Ju 160 Bf 161 He 162 Bf 162 Bf 163 Me 163 Me 164 Fi 166 FK 166 Fi 167 Fi 168 He 170 He 172 He 176 He 177 He 178 Bü 180 Bü 181 Bü 182 Ta 183 Fl 184 Fl 185 Fw 186 Ju 186 Fw 187 Ju 187 Ju 188 Fw 189 Fw 190 Fw 191 Ao 192 DFS 193 DFS 194 Ar 195 Ar 196 Ar 197 Ar 198 Ar 199 Fw 200

201 to 300	Si 201 Si 202 DFS 203 Si 204 Fw 206 Me 208 Me 209 Me 209 (1943) Me 210 Hü 211 Do 212 Do 214 Do 215 Do 216 Do 217 Hs 217 He 219 He 220 BV 222 Fa 223 Fa 224 Ao 225 Fa 225 BV 226 Ho 226 FGP 227 DFS 228 Ho 229 DFS 230 Ar 231 Ar 232 Ar 233 Ar 234 Do 235 BV 237 BV 238 Fw 238 Ar 239 Ar 240 Go 241 Go 242 Go 244 BV 246 Ju 248 BV 250 Fw 250 Ho 250 Ho 251 Ho 252 Ju 252 Fi 253 Ho 253 Ta 254 Ho 254 Fi 256 Sk 257 Fw 261 Me 261 Me 262 Me 263 Me 264 Fl 265 Me 265 Fa 266 Ho 267 Ju 268 Fa 269 He 270 We 271 Fw 272 He 274 He 275 He 277 He 278 He 280 Fl 282 Fa 283 Ta 283 Fa 284 Fl 285 Ju 286 Ju 287 Ju 288 Ju 290 Me 290 As 292 Hs 293 Hs 294 Hs 295 Ar 296 Hs 296 Hs 297 Hs 298 Fw 300

301-	Me 309 Me 310 Do 317 Do 318 He 319 Me 321 Ju 322 Me 323 Me 328 Me 329 Fa 330 DFS 331 DFS 332 Fi 333 Me 334 Do 335 Fa 336 Fl 339 E.340 WNF 342 He 343 Rk 344 So 344 Go 345 DFS 346 Rk 347 Ba 349 Ju 352 Me 362 Me 364 Ju 388 Ju 390 Fw 391 Ar 396 Ta 400 Me 409 Me 410 Do 417 He 419 ZMe 423 Ar 430 Ka 430 Ar 432 Do 435 Ar 440 Ju 452 Me 462 Ju 488 Fw 491 Me 509 Me 510 He 519 ZSO 523 Ar 532 Do 535 E.555 Me 609 Ar 632 Do 635

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