An area where government spending in aviation resulted in real gains, piggybacked on by commercial systems developers who get too much of the credit for progress.
The FAA needs to drag some of these jerks out behind a hangar and beat some sense into them, or at least yank their tickets until they pass a TOUGH re-test.
Frankly, I've seen this not only...
The definitive source:
The International Cessna 195 Club.
An interesting aircraft from an uninteresting source:
Until Russia abandons its neo-Nazi political system,
and rejects its Hitler-imitator leader,
"Black Diamond is company-funded and free from government security regulations, which has allowed the company to involve its commercial aircraft unit and its outside partners."