I can conceive of a place somewhere between taking "... several hours to produce a single set of fins..." for "...model rockets which are carefully and lovingly assembled with care..." and the "...duct tape and cardboard option."

You are testing E45 motors. You want the fins to stay on, or not?

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-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President