If your boat has a V-shaped hull, the shaft length needs to match the transom height at the mounting location rather than the maximum transom height. When determining the right shaft length for your boat you are going to want the cavitation plate of the kicker even with the bottom of the boat. This means you will have a separate throttle and shift control box for the kicker at the helm and all of the steering is done by either using the primary motor as a rudder or linking the two motors together so they turn simultaneously. Remote steer models will be controlled completely at the helm. This way all of the steering is done at the helm, but you will still have to go back to the kicker to control the speed if need be. There is an option where you could link the two motors together so that you could set the desired throttle on the kicker and steer with the primary motor. You’ll want the kicker motor’s anti-ventilation plate to be even with the bottom of the hull for best efficiency. If you go with a tiller steer model, the captain will have to do all of the starting, steering, and throttle at the back of the boat where the kicker is installed. Kickers come in both tiller steer and remote steer models. These brackets are spring loaded so that the motor can be raised and lowered. Other rigs that are larger such as your big lake boats or salt water models will need a bracket bolted to the transom to hang the kicker on. Hull speed in knots can be calculated by multiplying the square root of the boats length at waterline by 1.3. These transoms allow you to bolt the kicker right next to your primary motor with the ability to fully tilt and trim the motor. Boats designed for things such as walleye fishing will have a transom that is set up for the addition of a kicker motor. One thing to think about is where you are planning on mounting your kicker motor. For those that have the separate throttles at the helm right next to the regular outboard throttles. These motors are just as commonly run as the high thrust models for a kicker. A Mercury 9.9 4 stroke exlpt big foot prokicker Controls to steer from the helm with separate starter, trim and throttles Tie-bar and. Anything under that size is going to be a standard non-high-thrust model. High Thrust models typically start at 9.9hp which is generally the horsepower size most boaters go with for a kicker. This provides the thrust and control that is desired for running your boat at slower speeds. These motors are built with a gearcase that has a lower gear ratio and are equipped with a larger diameter propeller. Some of the manufacturers make whats called a High Thrust model.
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