Looking at various propeller designs, I started wondering about these limitations:
- Large propellers at high speeds have tips going supersonic
- Scimitar props attempt to keep prop tip from going supersonic
- Counter-rotating props absorb more power at smaller sizes
This made me wonder if a coaxial prop had a larger prop spun at slower speeds and a smaller prop spun at high speeds would increase thrust better, or do other designs already deal with that problem?