This may sound nuts, but if the problem is the Aluminum bulkhead, the F-35 already has the Titanium bulkhead figured out. As I'm not in the middle of this program, no idea why the swap ... unless the cost of Ti made one of three models prohibitive? (That just makes no sense, to me)
What is it about Ti that is less attractive than Al for the structure?
I am having trouble accepting that it's a weight issue alone.
Color me confused.