Igor ___, US aeronautical engineer who designed the first four-engined aeroplane (1913) and the first successful helicopter (1939)
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Related clues
- Igor, inventor of the modern helicopter
- Igor, Russian-born aviation pioneer who invented the world's first mass-produced helicopter
- Igor _, Russian-born US engineer who designed the first successful helicopter
- Aviation pioneer Igor
- Inspired by stories by Jules Verne and sketches by Leonardo da Vinci, inventor of the first mass-produced helicopter
Possible answers
- S
- I
- K
- O
- R
- S
- K
- Y