Helicopter aerial refueling.
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Previously:
https://www.homemadetools.net/forum/...748#post159705
https://www.homemadetools.net/forum/...771#post156015
https://www.homemadetools.net/forum/...343#post146341
https://www.homemadetools.net/forum/...580#post128257
https://www.homemadetools.net/forum/...047#post112273
