Coaxial contra-rotating propeller device, assembly method thereof and stratospheric airship
The invention relates to a coaxial contra-rotating propeller device, an assembly method thereof and a stratospheric airship. The coaxial contra-rotating propeller device comprises a first propeller, afirst motor connected to the first propeller through a first connecting structure, a second propelle...
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Format: | Patent |
Sprache: | chi ; eng |
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