Helicopter Theory
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| Google books | books.google.com |
|---|---|
| Originally published | 1980 |
| Authors | Wayne Johnson |
| Date of Reg. | |
| Date of Upd. | |
| ID | 2064592 |
About Helicopter Theory
The history of the helicopter may be traced back to the Chinese flying top (c. 400 B. C. ) and to the work of Leonardo da Vinci, who sketched designs for a vertical flight machine utilizing a screw-type propeller. . . .