Military Aviation => Military Aircraft => Topic started by: Air Marshal on October 11, 2005, 11:02:17 AM

Title: F-7 Vs Mig-21 (A Serious Discussion)
Post by: Air Marshal on October 11, 2005, 11:02:17 AM
Here check the difference between F-7 & Mig-21. According myself i took some differences between these aircrafts. Here i dont talk about here speed, Armament etc...
Title: Re: F-7 Vs Mig-21 (A Serious Discussion)
Post by: alyster on October 12, 2005, 05:28:04 PM
I don't know much about this aircraft, but here's a pic that I found....

J-7 from site :

Is it that site mistake or is it a new version(J-7FS) of J-7, but it is totaly difrent from J-7 pics u have here.

Title: Re: F-7 Vs Mig-21 (A Serious Discussion)
Post by: Webmaster on October 19, 2005, 02:14:10 PM
First, those differences can be explained when you take a closer look at the variants. The J-7 was based originally on the first generation MiG-21F-13, with no airbone radar. From the MiG-21PF onwards the RP-21 'Spin Span' radar was installed into the nose, resulting in a larger intake and cone.  The MiG-21 photos you are showing are MiG-21bis I suppose, which means they are of the fourth generation, with the more advanced RP-22 Jaybird radar.  That F-7MG is a  modified F-7 with the GEC-Marconi/LETRI Super Skyranger multi-mode radar, so we are talking here about let's say a 'third generation J-7' probably.

The other MiG-21 you show is the trainer version, I guess the MiG-21UM, which is a modified MiG-21U probably with larger fuel cell in the spine. That FT-7 was probably based on the MiG-21U, which explains the difference.

The MiG-21 and Chinese J-7 although initially a copy, went both their own ways in development. They are some exceptions in the family lines though, for example the J-7D which was based on the third generation MiG-21MF, as is clearly visible

That J-7FS is just an experimental modification by CAC, incorporating a larger radar antenna, and thus the intake/nosecone configuration was revised. It was probably a private venture by CAC... The 'Super-7' design also incorporating a revised intake/nose arrangement had more success, ultimately resulting in the FC-1.