Timothy R. Cook wrote:
> Bill DeWitt wrote:
> 
>> No-Tar, "No Tail Rotor" helicopters use a variety of methods
> 
>  > to battle counter-rotation while maintaining directional control.
> 
> Didn't they try some helicopter designs without tail rotors at
> all, but posessed two main rotors going opposite directions?
> 

There are some helicopters built using that concept, like the russian 
Ka-50 Hokum combat helicopter. It has many advantages over the 
traditional approach.

SP!

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