I was going to pin the interstage coupler and the top coupler.I was hoping to use 1 or 2 but it looks like 3 is the way to go.
[rant] So I'm going to talk about getting into the weeds. That is fine if it's what you want to do. But...
If you are flying a 3FNC or 4FNC rocket without a large draggy bottom end, friction fit of the lower part to the upper will work find. As long as you can pick the rocket up by the nose cone, give it a good shake and nothing comes apart, you are good to go. Just don't over do your drogue ejection charge. Remember, you only need to separate the two halves enough so the drogue chute gets into the air stream. Reasonable charges, short shock cords and a successful shake test will do you well.
I know, that doesn't follow all the math, calculations, goes with the "shear pins or fail" trend or falls into to being a "rocket scientist" mode, but it works and works well and consistently.
[/rant]
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