Sukhoi T-5 Fighter Interceptor Prototype

[hesham]

From this book,

Before the world knew the fearsome and agile Su-27 Flanker, there was the Sukhoi T-5 — a bold experimental prototype developed in the early 1970s as part of the Soviet Union’s quest to match or outperform the American F-15 Eagle. The T-5 was among the earliest iterations under the PFI (Perspektivnyy Frontovoy Istrebitel or Advanced Frontline Fighter) program, and served as a testbed for new concepts in aerodynamics, flight control systems, and overall layout that would define the legendary Flanker series.
With its twin-engine configuration, blended wing-body design, and large wing area, the T-5 featured the design DNA that would later evolve into one of the most respected air superiority platforms of the Cold War and beyond. Though it never entered service, the lessons learned from its test flights directly influenced the Su-27's outstanding maneuverability, long range, and powerful radar systems.

 

[overscan (PaulMM)]

What are you going on about? The text is complete garbage. Can you see large wing area, blended wing-body design?

 

[hesham]

What the hell are you going on about? The text is complete garbage. Can you see large wing area, blended wing-body design?

I got it from here,

Aviation Review Materials

Sukhoi T-5: The Forgotten Prototype That Paved the Way for the Su-27 ✈️ Before the world knew the fearsome and agile Su-27 Flanker, there was the Sukhoi T-5 — a bold experimental prototype...

www.facebook.com

 

[overscan (PaulMM)]

Its complete nonsense from start to end, and a glance at the drawing should tell you that.

The T-5 was converted from the T-3 prototype (c/n 01) at MMZ
No. 51. Due to the extent of the changes, the conversion job took
eight months (from October 1957 to June 1958). In early July the
aircraft was delivered to the flight test facility in Zhukovskiy to
commence ground checks, with M. I. Zooyev as engineer in charge
of the tests. On 18 July the T-5 made its first flight in the hands of
Vladimir S. Ilyushin. The manufacturer’s flight test programme,
involving 26 flights, showed that with the engines in afterburner
mode, the aircraft was overpowered and, in spite of the decidedly
higher drag (primarily due to the wider rear fuselage), could reach
much-higher speeds than the T-3. In fact, the engines’ structural
strength was the limiting factor, since the R11F-300 was not
designed to withstand speeds above Mach 2.
On the downside, the R11F-300’s automatic fuel control unit
still had a few bugs to be eliminated; as a result, the engines ran
unstably, the afterburners often shutting down spontaneously dur-
ing climb. Engine starting proved problematic as well, since both
engines used a common air intake and, figuratively speaking,
were short of breath. (It was much the same story with the MiG-19,
where the two engines breathed through a single air intake divided
by a splitter into individual inlet ducts; the downwind engine had
to be started first, otherwise the upwind engine would literally
take all the air away from it!) Furthermore, the T-5’s longitudinal
stability proved to be unacceptably low (to be precise, the aircraft
had virtually zero stability due to the CG being positioned well
aft). In May 1959 the aircraft’s chief project engineer, Yevgeniy G.
Fel’sner, called a halt to the test programme.

Yefim Gordon, Sukhoi Interceptors (Schiffer, 2019)

 

[Fibonacci]

Hey guys! Just a couple of pictures.
Source:

https://twitter.com/x/status/2028958516765987054

View: https://x.com/WDequid/status/2028958516765987054