top of riser to top of barrel

Robert Cloud Jr

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posted 9 years ago

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What is the recommended distance from the riser top to the barrel to with an 8 inch diameter riser?

thomas rubino

master rocket scientist

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Location: latitude 47 N.W. montana zone 6A

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posted 9 years ago

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If its a J tube than 2" is the recommended minimum.

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Peter van den Berg

gardener

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Location: +52° 1' 47.40", +4° 22' 57.80"

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posted 9 years ago

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If you devide the cross section area of the riser by its circumference you'll get the size of the minimum top gap. This is correct for round and square risers alike.
Be careful though, the top of the barrel buckling in would mean you'll get much less than the minimum, so it would be wise to add some tolerance. Please be aware of the fact there isn't such a thing as a maximum top gap.

In case you are talking about a batch box instead of a j-tube, the recommended top gap is one foot.

regards, Peter

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