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Thanks Neil.
I just followed your procedure, outlined above, on numerous rockets I've already built. I don't see enough of an impact on the final simulation results to justify being concerned. Negligible impact.
With your builds trending toward the "oddroc" category, I'm speculating that they might be comparatively high drag to start with, in which case, the additional drag of the cone may not be significant. But it clearly makes a difference (~12-13% in apogee without busting out the calculator) with my 4FNC kitbash, even though it's a "low and slow" flyer by 3/4FNC standards. It's nowhere close to Big Daddy short/fat at 8.07:1.