posted on May, 4 2005 @ 07:46 AM
At mid 60s, in Soviet union was born the PFI (Perspektivnyj Frontovoj Istrebitel - perspective frontal fighter) project. It was aimed to develop the
fighter, that could fight with american F-X. But the specifications were too strong and they could not be achieved by single type of aircraft. So
after strong lobby of A. I. Mikoyan, the project was divided into light LPFI and heavy TPFI fighter.
As the part of TPFI program, Sukhoi worked on two different proposals. First group derived their proposal from heavy intercontinental bomber Sukhoi
T-4MS (200). The main characteristic was maximal and tactical range so in the aircraft had to be place for 9000 kg of fuel. The modified flying wing
schema was applied and the design received designation Schema 6. Maximal take off weigh was estimated at 25 – 30 tons. It has very thin fuselage
because of strong L/D ratio, so it had to use four smaller engines with half thrust instead of standard Saturn/Ljulka AL-31F.
Second proposal called Schema 7A had integral fuselage with two separate engine nacelles under it. Vertical and horizontal tail was also doubled. This
design was developed by young MiG engineers, who moved to Sukhoi at early 60s. At TsAGI, work on this concept was divided into three problems. First
was eddy aerodynamics, then integral detention between wing and fuselage and finaly adaptive wing. It was tested on more than 20 small aerodynamic
This design was selected in 1972 for further development and in 1977, the Sukhoi T10-1 prototype was ready for flight.
But it has many problems, so primary engineer Simonov proposed, that basic schema should be used again, but everything other will be made once again
from the beginning. Then the Sukhoi T10S or T10-15 was born and we know it now as Su-27 Flanker.