The first long tail boat was born on the shape of a motorized paddle boat, such as a pump. Or old trash Come up with a long shaft with a propeller tip. Then put to the middle of the hull. Let the impeller dip into the moderated water. The power of the engine sent straight from the machine to the propeller. To cut the problem of expensive and rare gear. Traction propeller to rotate. The propeller will push the water far enough away from the hull. Cause pressure to run the boat.