Been staring at this spool for months. I could have just done a standard 'motor in the center' approach, but figured, why not go for something more interesting. It will use a cluster of 2x18mm motors. The motor tubes will be sealed at the top with fixed nose cones, and vent into the spool hub tube, which itself will be sealed at the bottom. The body tube will be mounted to the top of the spool hub, and assuming I get everything airtight, a chute will deploy upon ejection charge firing. Should be a fun build and rocket.