A Very brief and simple guide to making Tandem Rotor vessel in Stormworks. Many thinks to the community that helped my troubleshooting. I didn't see a Tandem Rotor Guide so here it is.

T___T < the shape of the chopper where T are the propellers. Like a Chinook.

The rotors should cancel each others' torque, so placed mirrored, with yaw achieved by rolling the rotors oppositely.

Rotor Placement:
* Front Rotor = Normal
* Rear Rotor = Mirrored (U key)
* Pitch connects normally.
Add Blocks
* Front Add block = Yaw + Roll >> front rotor roll
* Rear Add block = Yaw + Inverted Roll >> rear rotor roll
For Lift
* Propellers must be set to Neutral. Up/down to Collectives.
* Steady RPM to the motor input, with a 3:1 gear between the motor and rotor, arrow to the motor.