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Just to wet Resmoroh’s appitite here’s a shot from a sequence of A&AEE photos I have of a Beverly conducting ULLA trials at Larkhill.
It will give some idea of the height that ULLA drops were conducted at. Officially the height was described as “10 ft plus or minus 5”.
As to your comment about Triple ULLA being uncontrollable, one of the stories the Boscombe craftsman who prepared the loads told me was about the American (exchange) Test pilot, who would take his hands off the controls as the load left the aircraft, letting the cg shift lift the aircraft’s nose into a climb and only after the load had left would he retake control. 😮