Here is an interesting sidenote response from the engineering folks at Triumph.
Quote:
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In order to make the boat turn right the aft edge of the engine needs to move to the right. The propeller is rotating clockwise or to the right meaning that as the prop grabs at the water it wants pull to the right as well as to push the boat forward. The prop is designed to have the majority of the force translate into forward motion but the torque of the prop will also make it want to move to the right. This means that it is always going to be easier to turn the boat to the right (starboard) than it is to go to the left (port). Hydraulic steering has a mechanical advantage over cable steering that makes this a lot less noticeable but it is still there. The trim tab at the back of the engine is intended to help offset the torque generated by the engine but it will always be noticeably easier to go to starboard than to port. The speed of the boat will also play a roll in how well the trim tab offsets the engine torque.
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