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Old 01-10-2006, 05:18 PM
shockwaveriderz shockwaveriderz is offline
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Join Date: Mar 2005
Location: My Old Kentucky Home
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Craig: I can answer your "B." estes question above. In the mid 60's there became a effort for the implemetation and adoption of the metric system here in America.... we were still using the OLD "english" system.....

The NAR Sporting Code became metric in late 1967.. EStes, centuri more or les followed suit around the same time frame..
EStes 1968 catalog was metric..Centuri 1969 catalog was metric..

I got into model rocketry in 67 at age 13 while in the 7th grade. I remmber the science teachers making a big deal about learning the metric system. It was to create a world wide standard on which to establish everything.

GHS wrote an article titled " Model Rocketry Goes Metric" for the 3/68 American Modeler magazine..

As far as how did motors did their dimensions, see the 7/71 issue of Model Rocketry maga at Ninfingers website. It has an article by GHS that describes how they came to be.

http://www.ninfinger.org/~sven/rock...03n09_07-71.pdf

hth

terry dean

Last edited by shockwaveriderz : 01-10-2006 at 05:33 PM.
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