Using compressed air rather than explosive cartridges could simplify a lot of ground ops associated with weapons loading. It's not clear whether the air is provided in pre-charged cyliders, or if it is generated on-board. Either way, it is certain to add weight as compared to the current approach, both in the air source, as well as at the ejector foot, which will probably have to be bigger to give the same ejection velocity. For planes like the P-8, there is probably ample weight budget to work with, but not so for fighters or helos. Sounds interesting.
http://www.marketwatch.com/story/itt-exelis-ejection-system-successfully-completes-first-airborne-weapons-separation-test-2012-03-19
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