So, unfortunately, we couldn't keep up with the various kinks and goofs that eventually crippled the launcher. When we got to the expo, everything was great except the valve at the back through which air was pumped didn't stay sealed. We suspect that the cold air weakened the budget epoxy we used to seal it, and that spelled its demise.
Overall, however, the project is salvageable. Alex will probably take it home with him this winter, much to the dismay of his cats that it will inevitably torture. We had a blast working together and the fact that we had something even partially functional counts as a success to us. So long!
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