How many calibers for transition coupler?

What's a good rule of thumb for how long the exposed coupler should be if it's being used as a transition in a 2-stage rocket?

As usual thank you.

Justin

Reply to
FlyEmFast
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I use 1.5:1 total 0.75:1 exposed.

Reply to
Jerry Irvine

Thanks for the fast answer.

Justin

Reply to
FlyEmFast

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