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The size of a deployment charge depends on the size of the rocket, the altitude of deployment, the recovery system used, etc. While you can do trial-and-error testing to find the right amount, it is best to start with a calculator to determine charge size. It is important to always check your numbers with two different calculators and make sure they provide the same/similar charge size.
The two most common charge calculators calculator used by the team are the Rimworld Charge Calculator and the is the BP Estimator.
The calculators usually provide good info, but ground testing is also required for every rocket as well.
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