[Seahawk]

Originally Posted by cockerpunk

we are talking about different things. im talking about the safety system in the sub to listen for the hull cracking ... not a hydrophone/passive sonar system.

wiki link: https://en.wikipedia.org/wiki/Acoustic_emission

Copy. My bad.

I still own 35% of a composites company, not thick composites but the discussion threads on this are very informative. There is a lot more to even simple composites than many can imagine.

When composites became more main stream for aircraft, the scrap rate for even the big manufacturers of thick composites, in my case when I was the IPT lead for the Bell Y/Z helicopters, was very high.

The amount of Destructive and Non-destructive analysis almost killed the program.

We do FAA composite repair work on commercial aircraft parts and the quals, tracking, inspections are brutal but they pay well.