In addition to the Rocket Database download and my online Centering Ring Generator, I've added a new Shroud Calculator. It's like others I've seen online (after all, the math is the math) but has a few added features.

First, when you are filling in the small and large tube sizes, you can choose body tube types (both Estes and Centuri/Semroc sizes are available) from handy pulldowns... no more pulling out the catalog or trying to find the numbers online, then transcribing them by hand.

Next, results are presented three ways: As decimal inches (to three places), fractional inches (rounded to 32nds) and millimeters (rounded up). I don't know about you, but I don't have a ruler marked in decimal inches; either 32nds of an inch or millimeters are better choices for me.

http://rocketry.newcenturycomputers.net/tools.html

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My site: http://rocketry.gonnerman.org