A part of the aircraft skin from the bottom of the SR-71 in the lobby at the Strategic Air and Aerospace Museum, Gretna, NE
A part of the aircraft skin on the bottom of the SR-71 in the lobby at the Strategic Air and Aerospace Museum, Gretna, NE

A few additional details I collected from my visit to the Strategic Air and Aerospace Museum, Gretna, Nebraska.

The Pratt & Whitney J-58 tubojet engine which powers the SR-71 at speeds in excess of Mach 3. The engines contain high temperature nickel and cobalt alloy parts. These engines would get so hot at cruise that it expanded 2 1/2 inches in width and grew 6 inches in length. These engines are capable of swallowing 100,000 cubic feet of air per second.
One of the four B-17 Flying Fortress Pratt & Whitney R-1690 “Hornet” radial engines each producing 750 horsepower at 7,000 feet.
A-26B Invader noise cone, Strategic Air and Aerospace Museum
Three of the six Pratt & Whitney R-4360-53 pusher-type radial engines found on the B-36J Peacemaker bomber at the Strategic Air and Aerospace Museum, Gretna, NE