Mölders 1
Old-Salt

Having captured an Upkeep mine, they reverse engineered it. I'm sure I've read "within ten days" but without the text in front of me, I blame faulty memory.
Not understanding the importance of backspin, they tried to rocket assist it to stop it matching the speed of the plane that dropped it. Gave up in 44.
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Bouncing bomb - Wikipedia
en.m.wikipedia.org
Are you thinking of the weapon nicknamed "Kurt"?