The XB-70 was a Mach 3.0 aircraft and noted by NASA to be the world’s largest experimental aircraft.
This view shows both the engine inlets themselves and the shape of the fuselage that houses the inlets leading to the intakes of each of its six engines.
Here is an exhaust view of the six GE YJ93 engines.
Often jet engines in development are flown on surrogate aircraft. The GE YJ93 was first flown on a B-58 at Edwards AFB, as seen here.
The XB-70 boasted some other unique design characteristics, including its use of compression lift and the ability to droop its wingtips to increase directional stability. For a detailed project description of the XB-70 program see NASA’s website here.
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