 Bull's gun system was not fast enough to be useful in this role, so it was adapted to use a "sabot" to improve its performance.Bull then moved on to hypersonics research and the study of infrared and radar cross sections for detection.As the UK's research efforts wound down in the post-war political environment, CARDE's joint UK-Canadian funding was dramatically cut back, with the project eventually being handed over to the Canadians entirely and followed by further cuts.