Klemm Kl 151

Kl 151
Role	Personnel transport and liaison
Manufacturer	Klemm
Designer	Dr. Hanns Klemm and Carl Bucher
First flight	10 September 1942
Status	Cancelled
Number built	1
Developed from	Messerschmitt Bf 108

The Klemm Kl 151 was a German prototype light passenger aircraft designed by Dr. Hanns Klemm and chief engineer Carl Bucher during World War II. Only one model was built.

Development

In 1940 Klemm received a request from the Reich Air Ministry (RLM) chief Ernst Udet to begin work on a version of the Messerschmitt Bf 108 Taifun using wood rather than aluminium for the airframe, since the metal was then in short supply.

One of the conditions was that the design of the Bf 108 would be used for the new aircraft. This created substantial difficulties. To speed up the project both the wings and the fuselage were based on already-built Kl 107 components. Since the fuselage was too short, Bucher extended it at the tail with a welded tubular steel framework covered with sheet metal, which also housed the tail landing gear. The wings were widened at the root and moved forward in order to accommodate additional fuel tanks, which replaced the two rear seats.

Flight tests

The prototype Kl 151 V1, designated with the Stammkennzeichen radio code of TB+QK, made its first flight at Böblingen on 10 September 1942, with Klemm's chief pilot Karl Voy at the controls. The aircraft was powered by a 240 Pferdestärke (PS) (236 horsepower, 176 kW) Argus As 10P inverted V8 engine. The planned model Kl 151-B, fitted with a 355 PS (350 hp, 261 kW) Argus As 410 inverted V12 engine was not built.

On 19 February 1943 the V1 prototype was transferred to the Deutsche Versuchsanstalt für Luftfahrt ("German Experimental Institute for Aviation") at Adlershof for testing, which was successfully completed on 1 March 1943.

The fixed undercarriage was a concern to the Luftwaffe, as the Bf 108 had suffered on the rough landing fields of the eastern front. Therefore, the requirement now demanded a robust as well as a retractable undercarriage. In place of the fixed tricycle undercarriage, now the V1 received one in a Y-configuration, with two steel half-shells welded together for the guidance of the shock absorbers on each side.

Further testing continued. Klemm used the aircraft as a personal transport until July 1944, when it was destroyed in an Allied air raid. The Air Ministry transferred the incomplete V2 prototype, and responsibility for further development and production, over to the Czech company Zlin. The problems caused by the demand for a retractable landing gear were finally solved, but the aircraft was never completed, nor put into full production.

After the war a revival of the project was considered, however Klemm instead decided on the Kl 107A.

Specifications (Kl 151 V1)

Data from

General characteristics

Crew: 2
Wingspan: 12.4 m (40 ft 8 in)
Wing area: 21.72 m² (233.8 sq ft)
Gross weight: 1,500 kg (3,307 lb)
Powerplant: 1 × Argus As 10P V-8 air-cooled, 90° inverted piston engine, 176.6 kW (236.8 hp)240 PS

Performance

Notes and references

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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Klemm Kl 151

Development

Flight tests

Specifications (Kl 151 V1)

Notes and references

See also