YME2019 Posted May 21, 2018 Share Posted May 21, 2018 (edited) Hi all! I'm trying to make some Gerb tooling since I currently have access to a machine shop. What I am currently looking at are 1/2" gerbs that are about 4 inches long. That seems a bit long to me, but I have 24 inch tube, so the math works out nice. Is there a recommended length? Additionally, I know how to size high power rocket nozzles, but I'm not sure how to run the calculations for gerbs. I want to make sure it is small enough that I get effect nice and high, but not small enough that it explodes. (I have 1/2" ID parallel wound tubes with 1/8" walls from Firefox.) What would be a reasonable nozzle size? Thanks in advance! Edited May 21, 2018 by YME2019 Link to comment Share on other sites More sharing options...
TheArchitect23 Posted May 22, 2018 Share Posted May 22, 2018 (edited) www.ma.dk/rts/rockettoolsketcher.exe install and select gerb. Follow the dimensions Edited May 22, 2018 by TheArchitect23 1 Link to comment Share on other sites More sharing options...
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