This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
This portion of the FAQ was prepared and submitted by Rob Masters,
firstname.lastname@example.org. Rob asked that the usual disclaimers to
use this information at your own risk, etc., be passed on to the readers
of this FAQ. Corrections should be sent to Rob, who will see that they
are incorporated and passed on the the FAQ editor.