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I built mine with both the booster and sustainer as 24mm. Flies great with C11's. Retrievable on a big field with D12's. I haven't had the balls to stick E's in it yet...Estes Boosted Bertha #1946. I included a stock version and my own modified version (24 mm booster).
If you haven't built it yet, I highly recommend the 24 mm MOD for the booster. The C11-0, and D12-0 move it real nice off the pad, but in my opinion an 18 mm booster is way under powered. If you build the booster with an 18 mm MMT, you have a very high risk of it going horizontal off the pad.
Please use Starfire's OpenRocket Files Feedback Thread for feedback or questions regarding these renders.
STOCK - 18 mm Booster
View attachment 569400
MOD - 24 mm Booster
View attachment 569401
I would also encourage you to stop by and view my blog: Starfire's OpenRocket Files.