reply to post by Wintergreen
The Wright Flyer used wing warping, which was derived from observation of birds in flight. Early delayed cluster bombs, used by the Germans in WWII
had a 'wing/scoop' that was roughly derived from samaras ('winged' tree seeds) to help scatter them, and slow their descent. I am sure that there
have been more, but there have been a few.
Practicality of the engineering is a big deal. Why reverse-engineer a cheetah when the same outcome is available with existing tech (as an example).
Squid ink would do a sub little good, as threats to a sub don't 'see'. However, if you could use a cloud to block/deflect sound waves might be of
use. Any bubbleheads can pick up that line and run with it.

