Lavochkin La-174TK


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Lavochkin La-174TK

Whereas sweptback surfaces had been adopted for both the La-168 and La-172, the La-174TK, designed to meet the demands of the same specification as the latter, featured unswept surfaces. The wing possessed a thickness ratio of only 6% (the "TK" suffix indicating Tonkoye Krylo, or Thin Wing) which the Lavochkin bureau believed might offer most of the advantages of a thicker sweptback wing while avoiding some of its disadvantages. The basic configuration of the La-174TK reverted to that of the earlier La-152 series fighters, although the relationship was confined to a common design origin, with the single 1590kg NII-1 (RD-500) turbojet exhausting under the rear fuselage. Armament comprised three 23mm NS-23 cannon and flight testing commenced early 1948. Although lighter than the La-172, the La-174TK demonstrated inferior handling and performance characteristics, further development being discontinued. The design bureau designation was reassigned to the replacement prototype for the La-172 which became the La-174D.

Lavochkin La-174TKA three-view drawing (1663 x 1183)

  Take-off weight3315 kg7308 lb
  Empty weight2310 kg5093 lb
  Wingspan8.64 m28 ft 4 in
  Length9.41 m31 ft 10 in
  Wing area13.52 m2145.53 sq ft
  Max. speed970 km/h603 mph
  Range960 km597 miles

Graham Clayton, e-mail, 12.02.2021 07:29

Before the La-174TK even flew, Lavochkin was already studying two infinitely more advanced jet fighter designs, the La-168 and La-174.


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