Very interesting. So, the idea of the shot charge detaching one part fo the target from the other was not "invented" with the Helice targets now in use, it would seem.
Garry, I think the two parts of the target had to be detached to score a hit. At least, that's the way it is in Helice (ZZ birds). The dome detaches from the propeller (wings). It is referred to as a witness cap.
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