3 Identical to [Test 5](test5.html), except using our new PVC pipe cap
4 casting tube caps. We hope that since these leave explicit air gap
5 above the propellant, that we'll get "cleaner" grains with the mix
6 self-leveling in the casting tubes.
8 These grains were cast on 4 July 2015.
19 Pour again went really smoothly.