Interesting project for F-4 (F-4X, RF-4X)

Sources...

https://tacairnet.com/2015/06/18/redeveloping-the-f-4-phantom-ii-into-a-mach-3-fighterspy-plane/

https://www.secretprojects.co.uk/forum/index.php/topic,1394.0.html



This project try to fulfill the needs of high speed reconnaissance aircraft based on F-4E phantom.

RF-4C/E already exist for this purpose, but this heavy modification targeted speed of MiG-25 level (M3...)

IAF requested GD to modify F-4E to enhance the high altitude high speed performance as shown below. 


1. Con-formal water injection tank for thrust increase

2. Increasing vertical tail for directional stability in high speed

3. Adopting new inlet


Expected Max Mach is 3.2, and it means that IAF could hunt MiG-25, primary threat for IAF at that time.

So, similar to MiG-25, both reconnaissance and fighter versions are proposed. 

However, US considered this project could motivate USSR to modify conventional jet fighter to intercept their 

primary reconnaissance asset, SR-71. 

And also, IAF could get F-15A which finally shoot down MiG-25, and they do not have to show interest that project. Then, this project is abandoned and only remain in X-project level.