Quoted By:
1. Retreating blade stall
2. Dynamic/Static rollover
3. Ground resonance
4. Loss of tail-rotor effectiveness (could be avoided by having a coaxial contra-rotating main rotor)
5. Dynamic stall
6. Vortex ring state
7. Vibrations (a lot)
8. Crashworthiness
9. Noise
10. Engines (higher power, lower weight and low fuel consumption)
11. Performance (blade design, powertrain,
12. High-altitude performance
13. They can't glide (they can autorotate though). Is a "lifting body" fuselage possible?
14. Cost (helos are extremely expensive)
15. No catastrophic failure warnings (basically they lack the alarms commonly located on fixed wings)
