Hello,
I had a collapse thrust tube on my second flight of my avonds F-16. This is the third time thrust tube has collapsed, twice with the previous owner and one more time yesterday. I feel there is something wrong which i want to share with you:
First of all the diameter of inner thrust tube is 67 mm where as the outer cone of P80 is 63mm. This leaves the margin of 2mm in radius or shall I say 2mm all around.
Currenly I am using carbon/Kevlar bypass, as original bypass burnt first time tail pipe deformed with the previous owner. This and BVM heat shield might have saved my aircraft from excessive heat.

The distance between exhaust cone of P80 and start of inner thrust tube (this is a double walled thrust tube with bypass) is 10mm.
Could someone let me know what could be wrong here.
I am also using FOD screen, and someone told me that FOD screen create uneven pressure inside bypass system and could have caused collapse.

Is it better to get rid of bypass system and get a new pipe with bell mouth?....something like Tamjets pipe?

Please giev me your input.

Best Regards
Asif