Piasecki X-49 SpeedHawk prototype compound helicopter.
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Previously:
https://www.homemadetools.net/forum/...381#post181482
https://www.homemadetools.net/forum/...219#post149989
https://www.homemadetools.net/forum/...167#post149737
https://www.homemadetools.net/forum/...690#post159457
https://www.homemadetools.net/forum/...646#post174402
