Vulcan XA903 used as a testbed for a multitude of experiments including the testing of the Olympus 593 and the Tornado RB199 engine, also it was the only Vulcan to be fitted with a 27mm Mauser cannon!.
Interestingly the other Vulcan that was used as an engine testbed was XA894 that had a TSR-2 engine slung under the bomb bay, so the story goes they were able to throttle the four engines back and fly perfectly well on the one Olympus 320!!.
Regards,
John.
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