Yakovlev Yak-1000

Yakovlev Yak-1000
Type:	Experimental airplane
Design country:	Soviet Union
Manufacturer:	OKB Yakovlev
First flight:	not flown
Production time:	1950-1951
Number of pieces:	1

The Jakowlew Jak-1000 ( Russian Яковлев Як-1000 ) was one of the numerous test samples from the Soviet aircraft design office Jakowlew , which were tested after the Second World War next to the types from Lavochkin , Mikoyan-Gurewitsch and Sukhoi , in order for the newly developed Jet engines to develop the optimally associated airframes.

history

In 1945, after evaluating German documents , Soviet engineers at ZAGI began to deal with the problem of a wing for the supersonic range. Two directions were pursued: on the one hand, the refinement of the swept wing , whose flight behavior was somewhat known, and on the other hand, the construction of a rhombic wing. At the end of the 1940s, the development of such a wing was completed and Alexander Jakowlev offered to design an airplane for it. Similar considerations led to the F-104 in the USA . Both designs followed the erroneous assumption that future air combat would be supersonic with missiles and at high altitudes. Great importance was therefore attached to achieving maximum speeds and the maneuverability that was previously important for hunters and important for classic curve fighting was seen as outdated. The Vietnam War was supposed to show that this was a misjudgment that both sides were subject to.

The machine, known as the Jak-1000, was designed and built from the end of 1950 to October 1951. The type was equipped with a delta wing that was very small and extremely thin compared to the length of the fuselage with an equally shaped delta tail, which was an experimental aircraft for reaching high speeds in the supersonic range closes. The Jak-1000 was supposed to reach the then unimaginable speed of Mach 1.7. At the same time, a 1: 1 model for wind tunnel tests was created at the ZAGI. However, this then resulted in a calculated maximum speed of only 1100 km / h and a sensitivity of the aircraft taking off or landing in crosswinds, which was felt to be too great. The F-104, which is extremely problematic in such situations, showed how right one was with this assessment.

The scooter trials on the ground by D. W. Sjusin began on March 3, 1951. Problems with the tandem landing gear, which was unusable for an aircraft of this type, as well as the expected aerodynamic complications during the flight made a trial in the air appear too risky, so it became Project abandoned in June 1951. Still, the Jak-1000 program was not a complete failure. The delta wing was further developed and was later used on the mass-built MiG-21 .

technical description

The Jak-1000 was a cantilevered middle decker in all-metal shell construction and had a landing gear in tandem construction, i.e. two main wheels arranged in the fuselage carried the weight of the aircraft, two support wheels placed in the middle of the wing ensured stability on the ground. The wing with three spars and ten ribs had a leading edge sweep of 60 °. The relative profile thickness was 3.4% at the root and 4.5% in the central part and at the edge arch. The tail unit was designed almost identically. The cockpit was hermetically sealed and equipped with an ejection seat .

Technical specifications

Parameter	Data
crew	1
length	11.69 m
span	4.53 m
height	2.95 m
Wing area	14.00 m²
Wing extension	1.5
Wing leading edge sweep	60 °
Empty mass	2510 kg
drive	an RD-500 with 15.90 kN maximum thrust
Top speed	1100 km / h (estimated)
Fuel supply	627 l in a 460 l and a 167 l tank

See also

• List of aircraft types

literature

• Konstantin J. Kosminkow: In search of the supersonic wing - experimental aircraft Jak-1000 . In: Fliegerrevue . No. 2/95 . FlugVerlag Berolina, Berlin, p. 36-38 .
• Wilfried Bergholz: Russia's great aircraft manufacturer . Jakowlew - Mikoyan / Gurewitsch - Sukhoi. Aviatic, Oberhaching 2002, ISBN 3-925505-73-3 , p. 61 .

Web links

• Image at aviastar.org. Retrieved May 22, 2020 (English). 
• Як-1000 on airwar.ru. Retrieved May 22, 2020 (Russian, story, photos & dates).