Aircraft speed tape.
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Previously:
https://www.homemadetools.net/forum/...311#post181128
https://www.homemadetools.net/forum/...821#post171191
https://www.homemadetools.net/forum/...533#post162509
https://www.homemadetools.net/forum/...164#post149718
https://www.homemadetools.net/forum/...925#post144659