Ask him about "Centuri Enerjet D21, The Motor That Never Was", Sport
Rocketry, Jan/Feb, 2006. Does he have any comments, corrections, or
additions to the article? What was the green plastic D21 case
material? How many D21 motors were actually sold to rocketeers, e.g.
at NARAM-12? How many D21 motors were otherwise given to rocketeers
or merchants, e.g. as gifts or promotional samples?
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