Recently I've been chainsawing large bowl and platter blanks from black walnut trunk sections (25" total diameter; 20" heartwood). After rough turning and coring, the largest bowl is 20"+. Using the 10 percent guideline, wall thickness is 2" or more. Regardless of using paper bags, sealer or another method to prevent cracking, is there a diameter where you start to lose significantly more stock? I'd rather find out now vs a year or more later. I understand few people want finished bowls anywhere near 20". My intent is to donate them as auction items for nonprofits events, etc. If I'm likely to lose a large percentage of these bowls I'll start with smaller blanks and be content with a diameter that is much less prone to cracking. Thanks in advance for any words of wisdom!
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