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Wind tunnel tests were conducted on the new fuselage shape and the redesigned engine intakes. Rolls Royce conducted flow distribution tests on full scale intakes, and engine test bed runs, amounting to more than 1200 hours, were undertaken. An existing electrical test rig facility at the Hawker Siddeley Woodford factory was modified to prove the new electrical generating system. Tests began in April 1966.
Originally posted by ignorant_ape
hi - could you identify the direction that the noise came from - and if it was moving ?
Originally posted by Pervius
Russian Bear bomber. They've flown over your country...and American airspace many times recently.
They don't send fighters up to chase them away all the time.