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Please see the following photo. (I cannot post it) http://i1163.photobucket.com/albums/q554/startanewww/CIMG4548.jpg

Why is atomic bomb in a "fish-like" shape? (I don't know how to describe it) Is it specially designed for some purposes?

Thanks a lot.

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closed as off topic by David Z Aug 24 '12 at 4:21

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The picture you link to appears to be unusual for a air-droped bomb only in being particularly thick. I mean, it has the cylindrically symmetric casing of the weapon and some fins, just like every other iron bomb. –  dmckee Aug 21 '12 at 21:00

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up vote 8 down vote accepted

The diagram looks like the Fat Man bomb that was dropped on Nagasaki. The Wikipedia article gives lots of info on the design if you're intereted in pursuing it further.

The casing is just to make it aerodynamically stable so it fell in a controlled way. The bomb itself is spherical so the case could be spherical as well if it weren't for aerodynamic requirements.

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