| Attitude stabilization in hover flight of a mini tail-sitter UAV with variable pitch propeller Recent countries visiting this post |  |
 | 7 | United States |
 | 6 | China |
 | 3 | Israel |
 | 1 | Germany |
| Attitude stabilization in hover flight of a mini tail-sitter UAV with variable pitch propeller Recent countries visiting this post | |
| 7 | United States |
| 6 | China |
| 3 | Israel |
| 1 | Germany |