In article ,
BackToNormal writes
True. Where I wrote "never saw fruition" I should have written "was
sidelined". Instead, he designed the spherical bomb and refined that
into the cylindrical bomb used to breach the dams.

Apparently the diameter of the spherical bomb with the right amount of
RDX would have been too large to fit under a Lanc. It was changed to a
cylinder to reduce the diameter and the spinning used to give it
gyroscopic precision so it hit the water horizontal each time.

--
John