From 2011 April issue of AOPA Pilot magazine:
- What was the code name for the secret program that evolved into the SR-71 Blackbird?
- The project known as “Arch Angel” created the A-1 through A-12 aircraft that preceded the Blackbird.
- Why do SR-71s have white main-gear tires?
- The tires are coated with aluminum oxide to reflect heat so that the tires don’ t explode in the wheel wells during high-speed flight.
More info and some great photos at wikipedia: http://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird.