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(Almost) Worry-Free in the Wind

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August 2013

When Noel Allen surveyed aircraft damaged in windstorms he found a pattern. The tiedown rings on most of the PA-28 Cherokee series had broken.

He noticed something else, too: the OEM rings were created to sit at a 90-degree angle to the fuselage, while the rope tiedowns were stretched at an angle. This configuration put stress on the rings—side forces sometimes exceeding 2,000 pounds—in a windstorm.

Allen had an idea for a better tiedown and as an aerospace structural engineer, he was in the unique position to do something about it.

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