Actually the Chinook's blades are counter rotating and synchronized:

http://www.boeing.com/rotorcraft/military/ch47sd/ch47sddraw.htm

> > If you have a helicopter with 2 "fans" they
> > don't have to spin in opposite directions, provided
> > the fans are located apart from each other (like a
> > Chinook).
>
> This is complete balderdash.  Go back to freshman physics and do the
> analisys.
>
> Actually I thought the Chinook did have counter rotating
> fans.  If not, it
> must have some other means to equalize the net torque on the airframe.

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