The Lightning had particularly strong wingtip vortices when pulling 'g'. When a returning four-ship did a low run-and-break over Binbrook on day with a light breeze, the 30 seconds or so of quiet as the aircraft disappeared down-wind to land were often punctuated by the whistling and thumping of what must have been 8 vortices as they reached the ground, bounced off the hangar walls etc. On a calm evening with no other noise about from vehicles, ground equipment etc., the effect was as eerie as it was interesting.