From Martin Gregorie
So the Japanese have unveiled a revolutionary new jet engine
(15 April, p 10)?
Hardly. They appear to have reinvented the Pratt & Whitney J-58, most
famously used in the SR-71 “Blackbird” reconnaissance plane. This is early 1960s
technology, from the intake geometry to the afterburner via the bypasses. The
SR-71 first flew in 1964.
Harlow, Essex
