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Potato-shaped stones are better for skimming, say experts | Science | The Guardian

https://www.theguardian.com/science/202 ... ay-experts

While aficionados of the pursuit favour thin, flat stones for long-distance skimming, the researchers’ mathematical model reveals that heavier, potato-shaped stones can achieve more dramatic results, which blast the rock into the air.
“Try some wacky stones and see what happens,”

bulkier stones, even if thrown well, are not the sort to skip across the water a dozen or so times before disappearing beneath the surface

That sounds like fun.

I thought that you would be suggesting to not grow purple skin potatoes in rocky ground.

Certainly, it is a problem for me! Some are very good choices but I have to keep an identified stone nearby so as to tap questionable tubers and determine the difference.

Okay, I could use a bucket of water and rinse them. But, Good Grief, those rocks are handy - so, tap tap tap, I can skip the water.

Steve