drmeson
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maybe different engine
but about AIM-9p , its delivery started at 1978 are you sure we get those not the previous version that its delivery began from 1972 ?
the difference in weight maybe is because we developed it separately from AIM-9p and its not an aim-9p reverse engineered missile, so there are those changes in weight.
Here is the thing. AIM-9P/N/J have the same aerodynamic shape, weight, length etc. Only difference is an Indium antimonide (InSb) seeker for longer wavelength sensitivity + optical filter for all aspect attack. What IIAF got for F-14A was AIM-9J the pre version of AIM-9P. When Fatter was unvieled in an exhibition show in 2000s they presented it as "an All aspect heat seekin missile". Shahsafi new IRIAF Commander said that a maximgum of 40 km range during tests has been achieved (in line with AIM-9P/J). Authors related Fatter to be an AIM-9P copy because of all aspect capability which comes from an indigenous seeker that resembles none of the AIM-9 series seekers including AIM-9J that IIAF received. This seeker, whatever it is, also 3 Kg heavier than AIM-9J and AIM-9P.
Knowing the sudden rise in use of Focal Planar Array FPA Imaging IR guidance in Air defence IRSTs of Iran, I won't be too surprised if there are plans to use FPA for A2A missiles.
Turning Fatter into AIM-9X BlK II/III is well within Iranian reach and I will tell you how. We know multiple Iranian companies producing FPA (Focal planar array) seekers for AD batteries IRSTs. The above given Khordad system's TIC-S-2 uses a long-range secondary FPA tracking. The same system of guidance is used by modern most AIM-9X Blk III that arms F-22/F-35.
So with an FPA seeker and 1.6 times the solid fuel ... You get a modern IR-seeking missile pulling 30 G's with no escape zone of 60 KM. If slaved with HMD presented above, this becomes a formidable system even for low RCS adversaries.
I will write more on this subject
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