Yesterday evening some of the team got together to test igniters in a vacuum.
The broader context is developing a cut-down mechanism for high altitude balloons based off some existing methods.
In the picture below you can see that the portion of igniter charger in the immediate vicinity of the hot wire
reacted, but that's only a small portion of the whole charge.
From the test it seems that the black powder needs gas around it to help transfer heat to adjacent grains.
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