[brookwood]

Chinook helicopter had 2 counter rotating rotors instead of a main and vertical tail rotor. why having 4 is better is a little confusing

[KarlInOhio]

Chinook helicopter had 2 counter rotating rotors instead of a main and vertical tail rotor. why having 4 is better is a little confusing

You can control lift, yaw, pitch and roll just by controlling motor speeds on a quad copter without needing a collective and cyclic to pitch the individual blades. If you look at how those work you'll just walk from Midtown to JFK instead of taking a regular helicopter.

[sasquatch]

The Chinook rotors are connected by a shaft. Hard to lose one rotor. Electric motors could auto rotate by wire as generators if batteries drop out.