The inner tube goes into the outer tube. And the fins go on straight.
For Through-wall Assembly
by Qualman Rocketry, these are laser-cut centering rings which also
will hold your fins straight. They can evenly space 2, 3, or
through-wall fins, holding them straight without the need for extra fin
jigs for assembly.
They are sized for most motor mounts and all common BT-sized body tubes.
rings come with six slots which can be optionally removed.
4-fin assemblies, remove the four at 90 degree intervals. For
fin assemblies, remove the three at 120 degree intervals.
the remaining ones in place with glue if you want to use it as a
replacement to one of the cardstock centering rings.
These can be also be used in high power rockets, as an additional ring added for alignment. It's recommended to not replace a plywood ring with a cardstock ring.
cutaway view of aligning ring
|* Parts are
sometimes built to order. Please allow 2-3 business days for
Copyright Qualman Rocketry, 2016