BordoEnes
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First of all i will say that what kind of qualities a 4th gen fighter must have .
the first 4th gen fighters were built as multi-role fighters . these new fighters used Energy-Maneuverability (E-M) theory to increase their Maneuverability . and this is the formula : Ps=[(T-D)/W]*V .
with the use of this formula that was developed by an american pilot called John Boyd and an mathematician named Thomas Christie .
it was first used on F15 eagle and F-16 Fighting Falcon so they gained much more Maneuverability . but it made F16s unstable so with the FBW : Fly By Wire system it became again stable . also in this gen pulse Doppler radars were added to fire control systems ( that had the ability to look down and fire down ) and also the HUDs were added. another upgrades were multi-function displays : MFD and HOTAS (hand on tratel and stick ) . the new quality was using composite structures that reduced the weight of the fighters .
The next one is infrared search and track systems . IRST , after doing that it was the part building turn to show the qualities of the body of jet, now the jets just need 10 man-hour work to be take cared of .
the last invention was LEX plates that were used in the place that root of wings and body were connected togeather . this tech helped the jet to expand it's angel of fire .
sorry for writing mistakes etc...
and in Iran inventory we have two 4th gen fighters :
1- Grumman F-14 Tomcat
2- Mikoyan MiG-29 Fulcrum
now we must see that what is the problem of Iran with this info ... (engine will go to (E-M) theory..
Thats nice and all but the question remains, Does iran have the capability to built all these seperate systems? Not not in atleast a decade, First national fighter jets are almost curtain to be built with foreign help (look at Pakistan, Taiwan, S.Korea, Japan, India, China and many others for example) And as result of the sanction the Iranian fighter jet with huge amount of luck might just be classified as 4th Gen but thats unlikely in this decade...