( Sikorsky )
)
)
)
)
( Royal Aircraft Factory )
)
)
)
)
)
( A.V. Roe )
)
R
| R-4B
Hoverfly 1 ( Sikorsky ) |
|
|
|
|
||||
| Re8 ( Royal Aircraft Factory ) |
|
|
|
|
|
|||
| Roe
1 ( A.V. Roe ) |
|