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How to Position an Auxiliary Motor on the Transom of a 18-ft Power Boat?
I am planning to get an auxiliary outboard motor (likely to be a Yamaha
High Thrust T9.9), and mount it on the transom of a 18-ft center console. I have a couple questions related to exactly where to position it: 1. I have a 115hp main outboard motor already mounted at the center of the transom. Should I mount the small auxiliary motor in the left of the main motor or in the right? Does this really matter? I prefer to mount it left of the main motor if I can do that. 2. What is the minimum distance between the main outboard and the auxiliary outboard? I guess the auxiliary outboard is supposed to be mounted as much at the center of the transom as possible in order to push the boat properly, right? But the main outboard already takes the center place. Therefore, the auxiliary outboard must be off to the side. I am trying to figure out how close I should place the auxiliary outboard to the main outboard. Does this really matter anyway? I have a feeling that the rod that links the main outboard and the auxiliary outboard together may dictate how close I can put them together. 3. I would like to know how deep I should position the auxiliary outboard into the water. I have found two rules in the downloaded owner manual of Yamaha outboard. The first rule says that we should keep the cavitation plate at least 1 inch below the bottom of a boat if the outboard is being used as a main motor of the boat. The second rule says that we should keep the cavitation plate several inches below the water surface if the outboard is being used as an auxiliary motor in a sail boat (something to do with the sailboat tends to roll around). How do these fit into my case? Because my boat has a semi-V bottom, its sides are higher than the center. If I follow the first rule, I assume I should position the cavitation plate of the auxiliary outboard one inch below the bottom of the boat that is slightly higher than the lowest bottom of the boat because the auxiliary outboard is not centered in the transom. Is this right? If I follow the second rule, I will position the cavitation plate in a different place than if I had followed the first rule. Which one is correct? 4. I will mount the auxiliary motor on a motor bracket that can lift the motor up or down vertically. But that motor bracket seems to be designed for being mounted on a flat transom. But the transom in my boat is slightly curved. How should I mount the motor bracket onto my transom? Do I need to use some shims? How do people normally handle this situation? Thanks in advance for any info. Jay Chan |
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