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In reply to Post #20
Corkball or glass?
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In reply to Post #19
I roll 20 and 24,mm pop ups weekly 👌
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Purely to try and keep the bream away what ever i try is getting hammered, fishing in weed is keeping them at bay to an extent. After a number of years with out the *******s its a pain to deal with them again. I reckon I have had more bream from this water now that in the rest of my 40 year career.
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I use 16mm cork balls with a teaspoon of basemix paste which leaves me with a 20-22mm pop up. It requires very little putty to critically balance it on most pop up rigs. The skin is thick but it helps counter the buoyancy of the cork. They stayed popped up for days, tested in a jar. I use a measuring spoons instead of just pinching off some paste so my pop ups have a consistent buoyancy. I test the amount of paste required by wrapping cork with paste on an actual rig before boiling, the pop up will be at its heaviest at this point in my opinion.
I have tried larger cork balls but they require so much paste to make the amount of putty needed to pin it to deck unreasonable. Its crazy how much the buoyancy goes up as you go from 16mm to 18mm cork!
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In reply to Post #14
I would imagine to slow down bites from nuisance fish. Anything smaller than a 20mm hookbait on my water is just suicide in this respect. The bream and roach would be all over them. I know you’ll still get bites from them, but it’ll defo slow them down significantly.
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In reply to Post #1
After makng a few dodgy assumptions, I predict a 18mm cork ball in a 24mm boilie would make a decent wafter. A 20mm cork ball should make it pop up, but only just. A 22mm cork ball would require a few grammes of putty to hold it down.
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In reply to Post #1
Can I ask why a pop up so big ?
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In reply to Post #12
If we are comparing natural cork balls then the density will almost certainly vary. I did misread the original post though, apologies Vossy.
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In reply to Post #11
If the density of the cork ball are equal, it will be a linear calculation 
Density = mass/volume
So, if mass increases with a factor 2, volume should also double or the density isn’t a constant value
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In reply to Post #9
I don’t think the calculation would be as simple as this. The cork ball dimension is the diameter of the sphere. For buoyancy we are interested in the volume. When you increase the diameter the increase in volume is exponential rather than linear.
Theory is great, but in this case I would just buy some 16, 18 and 20mm cork balls and have a play about with the thickness of the skin vs buoyancy, you can always have a thicker skin of paste around the ball if its too buoyant.
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In reply to Post #8
Thats my worry - hence the question. It would take some serious convincing to get me to trust a straight mix. Glass sphere ( please save me the health drama ) I wonder about the mix and getting it right to pop it up and ( same with the cork) not need to much weight . I will order some cork balls do the maths as mentioned and go from there. Thank you for the replies thus far.
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In reply to Post #7
You could always core a mix based pop up & add a Cork plug, best of both worlds.
I've never made pop ups that big but, thinking aloud, if you're happy with your 18mm mix/Cork ball ratio as it is, you can scale it up to any size theoretically.
Ie, for example if your 18mm is 4g mix to 1g Cork ball = 4:1 that's 5g total/parts.
5g divided by 18mm x 22mm = 6.11g (r) total, divide by 5 = 1.22g (r).
So for a 22mm pop up the Cork ball would weigh 1.22g and the paste 1.22 x 4 = 4.88g
Order some Cork balls, weigh them, sorted.
Fairly sure that's right technically and assumes Cork ball buoyancy to be standard and reliable.
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In reply to Post #7
With the right mix you can. Cork balls the size you're asking about will be a nightmare to weigh down.
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In reply to Post #6
I wouldnt ever use pop mix - dont trust it. I want to be able to fish chods or hinges and not worry about them sinking.
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Bait