View Full Version : Drag Formula
RocketDog
05-15-2008, 06:23 PM
Folks,
I need help finding information about model rocket drag and the drag coefficient formula. I have the info from Stines book, but that info isn't as complete as I need, specifically with reference to the "A" area term in the formula.
If some of you folks could point me at information about this, I would greatly appreciate it.
Some models we fly obviously don't fall into the usual 0.750 Cd.
Royatl
05-15-2008, 07:08 PM
Find a copy of Estes TR-11, Aerodynamic Drag of Model Rockets, by Dr. Gregorek.
Estes seems to have removed it from their sites (both regular and educator).
rocketguy101
05-15-2008, 07:53 PM
Was TR-11 ever on the educator site? I have asked them several times to either re-issue it, or put it on the free download page...
this is a pretty good reference
http://my.execpc.com/~culp/rockets/rckt_eqn.html
John Demar's R&D report (http://web.syr.edu/~smdemar/rocketdrag.html) is good too.
If you really want to go in depth, buy Advanced Topics in Model Rocketry (http://www.apogeerockets.com/topics_advanced_model_rocketry.asp)
shockwaveriderz
05-15-2008, 07:55 PM
here's some online sources that may help:
http://www.grc.nasa.gov/WWW/K-12/airplane/dragco.html
http://web.syr.edu/~smdemar/rocketdrag.html
http://exploration.grc.nasa.gov/education/rocket/shaped.html
hth
terry dean
RocketDog
05-15-2008, 09:58 PM
Thanks guys ! That MIT book is one i saw a while back that may have what i need.
CPMcGraw
05-16-2008, 12:46 AM
I don't know how up-to-date this page is, but Commonwealth appears to be selling the Educator Packs.
http://www.commonwealth.net/rockets/esteseducator/teacher-resources.htm
Look near the bottom of the list. Priced at $8.19.
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