So-called "explosive bolts" (http://en.wikipedia.org/wiki/Pyrotechnic_fastener http://en.wikipedia.org/wiki/Pyrotechnic_fastener) are very commonly used in spac

So-called "explosive bolts" (http://en.wikipedia.org/wiki/Pyrotechnic_fastener http://en.wikipedia.org/wiki/Pyrotechnic_fastener) are very commonly used in spacecraft to separate various spacecraft components (e.g., rocket stages, or payload from shroud). I'm not familiar with the design considerations here, but lots of people remark that they seem like "the wrong solution". But, they are reliable, simple, and light weight.