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#11 (permalink)      8/1/2020 10:22:04 AM US Central   quote/reply + tips
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airwinny
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cilika wrote:

So 3 holes 1mm D would be equal with around a 2.6mm D hole (?)


For 2 holes, it's √2 x diameter, for 3 holes it's √3 x diameter

√2 = 1,41
√3 = 1,73

So:
2 holes of 1mm = 1 hole of 1,41mm
3 holes of 1mm = 1 hole of 1,73mm
3 holes of 0,8mm = 1 hole of 1,38mm

etc.

#12 (permalink)      8/1/2020 10:23:26 AM US Central   quote/reply + tips
essellar
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You were asking about two holes. Three complicates matters slightly, so some of the shortcuts won't work without modification. We'll do the not-quite-so-shortcutty way then.

Take your starting hole diameter and square it. In your example, that's 1, and squaring 1 doesn't have any exciting results, but keep in mind that you've done it anyway. That gives you a representation of the area - a number that will be in direct proportion to the area no matter what the starting diameter was. Multiply that by the number of holes - 3 in this case. Then take the square root. That gets you an equivalent single-hole diameter of about 1.74mm - and, coincidentally, a very clear explanation of why very small differences in hole diameter mean a helluva lot to people who like a tight MTL vape. (1.74mm is't 74% more air than 1mm, it's three times as much.)

Same deal going the other direction. If you know what the desired single-hole size should be (you're looking for a given draw, say), square the number you're looking for, then divide by the number of holes, then take the square root. So if you want a 3.5mm draw, but you want 3 holes:

(1) Square 3.5 to give you 12.25
(2) Divide 12.25 by 3 to give you 4.08 (ish)
(3) Take the square root to give you 2.02 (ish)

So three 2mm holes will give you about the same as one 3.5mm hole. (You can divide the diameter by 2 to get the radius, then use the proper πr² formula, do you multiply/divide by the number of holes, then divide by π and multiply by 2 to get back to a diameter, but you're just dividing by 2 at the beginning and multiplying by 2 at the end to get from diameter to radius and back to diameter again, and multiplying by pi then dividing by pi. No need to involve either step if there's nobody around with a red pen taking off marks, but if it makes it feel more "official", then...)

That will work no matter how many holes you're working with at either end of the calculation. You have two 7.3mm holes and want to know what that means on a 13-hole insert? Square 7.3, multiply by the two holes you have to get the total area (or, rather, a number directly proportional to it), divide by the 13 holes you want, and take the square root to discover you want 2.86mm holes.
#13 (permalink)      8/1/2020 11:24:28 AM US Central   quote/reply + tips
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cilika
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Thank you both of you! I get it now. :)
#14 (permalink)      8/1/2020 11:48:29 AM US Central   quote/reply + tips
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laxal
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Edited on 9/28/2020 at 5:40 AM. Reason:
#15 (permalink)      8/1/2020 12:02:40 PM US Central   quote/reply + tips
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cilika
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ok so two 6.3mm holes are equal with seventeen 2.16mm holes ;) =D=D=D
#16 (permalink)      8/1/2020 12:03:48 PM US Central   quote/reply + tips
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cilika
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Ha I didn't see your post, laxal.

that will be pretty big :p

Edited on 8/1/2020 at 12:05 PM. Reason:
#17 (permalink)      8/1/2020 12:14:20 PM US Central   quote/reply + tips
essellar
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Why calculate when you can just measure the size of the hole in the Albert Hall?
#18 (permalink)      8/1/2020 12:20:37 PM US Central   quote/reply + tips
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laxal
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Edited on 9/5/2020 at 6:54 PM. Reason:
#19 (permalink)      8/1/2020 12:42:27 PM US Central   quote/reply + tips
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philipvdb
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laxal wrote:

4,000 holes of 2.5mm in Blackburn, Lancashire, equivalent to one hole size?


Just to show off: 158,11

We can't agree on everything.
#20 (permalink)      8/2/2020 12:27:03 PM US Central   quote/reply + tips
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cilika
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Let me present you some East-European ways for variations on Lancashire's pot hole mending.



(anyway, it's always much easier to operate with squares than circles) ;)
#21 (permalink)      8/2/2020 1:36:46 PM US Central   quote/reply + tips
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laxal
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Edited on 9/28/2020 at 5:40 AM. Reason: