nash,
Pak-FA is a evolutionary design of a Sukhoi jet ,while the YF-23 is a Revolutionary design for maximum stealth,speed and maneuverability.YF-23 is considerard one of the most beautiful jet fighters ever made.
Is it not just a big Math problem when you try to design your own stealth fighter.So if the math problem has already been solved why would you try to redo all of that work when the answer is starring you right in the face. I hope that India and HAL could learn a lot from the YF-23 program ,and incorporate that into the FGFA and AMCA programs. Even if they copied the body of it ,and put in Indian avionics why not get the best.
The was a production version called FA-23.
http://www.secretprojects.co.uk/YF-23%204%20View.gifhttp://www.yf-23.net/Pics/F-23A/F-23A%2 ... 201415.jpgThe YF-23 took a very raidcal departure from the conventional design of aircraft. By using a very unusual shape the aircraft became very maneuverable and had a high top speed. By using the same angle on all flying surfaces (i.e. the nose, wing fronts, wing backs, ruddervator {rudder/elevator} fronts, ruddervator backs, and engine exhausts), the stealthiness is increased. Another advantage of using such unusualy shaped flying surfaces, is that the uncontrolability of the aircraft is increased so that when fly-by-wire is used, the manueverablity of the aircraft is increased greatly.
Northrop chose a far more radical airframe layout, driven by the objectives of stealthiness and supercruise. The extensively blended fuselage has rudimentary chines which smoothly blend into the wing leading edge, the blending allowing good area ruling and low supersonic drag. The low wing aspect ratio is used to optimise supercruise performance.
The Northrop/MDC YF-23 employed planform shaping with extensive blending, the latter technique used to advantage with the large B-2A. Blending has the major strength of not compromising high speed aerodynamics, the blended airframe offering very low drag by avoiding vortices which may be produced by a faceted geometry. In addition to RCS reduction through shaping, the YF-23 also employed carefully shaped exhausts to conceal the engine hot end, yet another technique developed during the B-2A program. The unusual 'diamond' planform of the YF-23 is a 2 major lobe design, as all major edges fall into groups of two parallels. The result of the low observables techniques was a major reduction in aircraft detectability by radar, and in the YF-23, also detectability by Infra-Red Search & Track (IRS&T) systems. This will radically shrink the usable envelope of hostile radar guided weapons and in the instance of the YF-23, also heatseeking weapons.
The YF-23 was a very agile aircraft. The YF-23 is a very unstable aircraft; however, when this instability is coupled with a fly-by-wire control system, this results in a very agile aircraft. Another attribute that lends itself to high mobility is the uniqueness of the tail. On the YF-23, instead of using two rudders and two elevators, it uses a ruddervator, a combined rudder/elevator. This ruddervator is angled at a roughly 45° angle to horizontal.
The YF-23 was stealthier than the F-22 Raptor. The two ruddervators reduce the Radar Cross Signature of the YF-23 significantly. This is beacuse instead of having four extremly large control surfaces on the tail, there are only two. The F-22 Raptor design utilizes the traditional configuration of two rudders, which are canted outward, and two elevators. This make the RCS larger. Another RCS reducing feature is the engines. These are mounted in nacelles in the wing that blend gracefully into the wing on the top, and form an extension of the fueslage on the bottom. The larger bottom fuselage lets it pack more missiles and other expendable weapons. The intake duct is angled up and inward to reflect radar beams and keep them from hitting the fast moving compressor face. The intake duct starts on the lower edge of the wing and moves through it onto the top of the wing. This feature can also reduce the RCS signature from a look down-shoot down radar from an aircraft flying overhead. Also reducing the RCS, is the way the leading and trailing edge of all surfaces are angled. All of the leading and trailing edges are angled the same. Therefore, the front of the right wing is parallel to the left wing's trailing edge, and the left section of the nose. For example, the leding edge of the wing is parallel to the trailing edge of the wing on the other side.
The YF-23 had a greater fuel capacity and therefor a longer range. By having a larger wing area and greater fuselage volume, the fuel storage of the YF-23 is increased over the F-22 Raptor. As a result of this, the YF-23 can fly longer CAP (Combat Air Patrol) missions. It can also fly deeper into enemy territory without the need to be refueled by tankers. As a result of the first one, fewer aircraft must be purchased. As a result of the second, less money needs to be spent on refueling tankers.
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that has all ready been solved ,and that is YF-23. Why do you think the Lockheed Martin 6th Generation Fighter looks just like a YF-23 because they couldn't make it better.
