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Drag or Negative Traction of Geared-Down Supporting Propellers in the Downward Vertical Glide of a Helicopter
| Author: | Toussaint, A. |
|---|---|
| Year: | 1920 |
| Document Type: | N/A |
| Series: | NACA Technical Notes |
| Report Number: | NACA-TN-21 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc54438/ |
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