High Power 2-stage - How long coupler?

Sooner Boomer

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I'm looking at building a high power two stage rocket. Probably a 54mm booster to 1" or 29mm sustainer (maybe 38mm). How long should the coupler be? Ratio by calibers?
 

Titan II

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I use at least 1C on each side.....usually more. My 4" to 38mm has 4" on the booster and 2" on the sustainer.
 
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