Originally Posted by tbzep

The original Estes K-36 separates at the capsule. The Estes #2001 (paper shrouds) separates at the same place as your Centuri kit, as does the latter Estes #2157 and #1969 kits (plastic shrouds).

Stick with the single D12-3 (if that's how it is built) for the demo launch at summer camp. It will look good, lift off slower (more scale like) and the kids can see the ejection better. If it's built as a cluster, you don't have much choice, either 3 C6's or 3 B6's. Make sure you use a good 12v ignition source and check your igniters before installing them.