Ultralight mosquito helicopter.
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Previously:
https://www.homemadetools.net/forum/...449#post135588
https://www.homemadetools.net/forum/...200#post145824
https://www.homemadetools.net/forum/...567#post143141
https://www.homemadetools.net/forum/...414#post142609
https://www.homemadetools.net/forum/...395#post142524
https://www.homemadetools.net/forum/...144#post141458
https://www.homemadetools.net/forum/...462#post135646
https://www.homemadetools.net/forum/...910#post133618