The problem: You have a three channel remote control system with a three position third channel. You want to be able to use rear wheel steering but you don't want it limited to just three positions.
The solution: This controller lets you have linear steering on the rear servo! Set your third channel to position 1, 2, or 3 Rear servo locked (rear servo stays in the center). Four wheel steering (make tighter turns). Crab steering (slew your rig left or right).
**Manufacturer recommends running a BEC with this 4WS controller**
When positions 2 or 3 are selected, the rear servo moves the same amount that the front servo does... well, to a point...
To protect your rear servo, there are end point adjustments on the controller so that you can set how far to the left and right that the rear servo can travel, this way, you won't risk straining your servo or linkage when turning sharp. There is also a trim control to make sure that you go straight when you let go of the wheel.
But is it waterproof?
Well, no. But, it is mostly waterproof, and you can make it waterproof if you like. The water can get in where you adjust the EPA and Trim controls. Once you have them adjusted, cover the openings with silicone or plastidip and you will be good!
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