Although the Vulcan was a 'conventional' delta rather than a 'slender' delta, it too had unusual handling charcteristics at low IAS - or more correctly at high AoA. These included significant adverse yaw and ultimately roll reversal with use of elevon in the rolling plane requiring cautious use of rudder to control yaw/roll and rapid IAS decay in level flight unless a lower pitch attitude was selected and a descent established. We didn't take the ac to anything close to the limits during our OCU on type, but I certainly remember how unnatural the low IAS/level flight regime was.
Even in the cruise the high drag at low IAS could catch the unwary! We didn't have any low speed buffet boundary limits as I recall, so when day over the south of France at FL410 when the nav plotter asked for a large speed reduction to cope with the unusual high level wind and timing requirements to make good a low level entry time, the captain decelerated to around 190 KIAS; when we tried to accelerate again it wouldn't do so even with the 4 Olympi bellowing as loud as they could. He had seemingly discovered Vzrc4 for that particular flight level and thrust available and it was only with the agreement of ATC allowing us to descend 4000 ft that we managed to accelerate out of the flight regime.
[ 03 September 2001: Message edited by: BEagle ]