Meatspin
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Here in Germany we optimized the process and just use these nowadays: https://www.stilum.com/wp-content/uploads/flecto-Karussell-auf-einem-Spielplatz-1030x687.jpg
Trust the Germans to make childhood playground injuries more efficient.
We have both kinds in playgrounds around my house here in Norway. My kids like both, but the ones from the OP is vastly preferred. They get a lot more Gs in the one with the bars.