Related time notes
- KA-27 Helix; Rugged, Reliable, Pin Up Model for Contra Rotating Rotors!12:09Coaxial lift, weight, and ASW systemsNotable Point
- KA-27 Helix; Rugged, Reliable, Pin Up Model for Contra Rotating Rotors!37:30Coaxial rotors trade tail-rotor losses for mechanical complexityNotable Point
- KA-27 Helix; Rugged, Reliable, Pin Up Model for Contra Rotating Rotors!41:04Kamov's coaxial layout continues in later Russian rotorcraftNotable Point