The American Clipper, a Sikorsky S-40 flying boat built in 1931 by Sikorsky Aircraft for the Pan American Airways.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...an_clipper.jpg
Previously:
https://www.homemadetools.net/forum/...929#post156687
https://www.homemadetools.net/forum/...065#post160731
https://www.homemadetools.net/forum/...117#post145358
https://www.homemadetools.net/forum/...097#post153553
https://www.homemadetools.net/forum/...665#post155656
https://www.homemadetools.net/forum/...594#post166858