__NOWYSIWYG__ The Water Ski is the part that enables you to ski on water, you need to use them with the Propeller. If they are not used with the propeller, you will not ski on the water, after driving in you will ski on your momentum and then sink as you will have no drive, after hitting the ocean floor, you will drive on your wheels and pick up enough speed for the skis to work, but when you run out of momentum you will sink again, and the cycle starts over.