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A comment on Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-Breaking Speeds. Parent comment

Re:Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-B... by Ono-Sendai on Tuesday February 19, 2019 @11:04PM (#19205421)
circumference = 2 pi r, so increasing the radius by 1 foot will increase the circumference by 2 pi feet, not pi feet.
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Re:Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-B... by Stratoscope on Tuesday February 19, 2019 @11:13PM (#19205463)
Thank you! I had a feeling something must be off in my 50-year-old memory of this puzzle.

I'd better buy an extra 3-4 feet of rope before I try this experiment.

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