The C11-0 is the one I use the most often, great for low altitude staging, especially 3 stagers. I fly a T-Bird clone built with a 24mm 1st stage, specifically for use with the C11-0. When I build a Farside-X, it'll be with a 24mm 1st stage. The C11-3 is particularly useful, less so the C11-5, and there's really no need for the C11-7.

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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org