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How Long the Shaft of an Auxiliary Motor Should I Get?
Wayne.B wrote:
On 31 May 2006 11:09:17 -0700, wrote: I am planning to get a 9.9hp outboard motor as an auxiliary motor. But I don't know how long the shaft should I get. As I understand it, the cavitation plate (horizontal surface above the propellor) should be at least several inches below the bottom of the boat when the motor is fully lowered. This is to prevent turbulent water and air from being sucked into the prop, which causes over reving and excessive slip (cavitation). Obviously your choice of mounting location for the motor bracket plays into this decision. Thanks for the info. If I understand you correctly, you are saying that the propellor of the auxiliary motor should be several inches below the bottom of the boat (just like what the propeller of my main motor current is). Here, the transom of the boat is a semi-V; the auxiliary motor will be mounted on the side of the main motor where the bottom of the transom is higher than the true bottom of the boat. I assume that I need to positon the propeller of the auxiliary motor slightly above the propeller of the main motor in order to keep the propeller several inches above the bottom of the transom (instead of several inches above the true bottom of the boat). Is my understanding correct? One thing that I would like to know is: What's the definition of the length of the shaft of a motor? How is this being measured? Is this measured from the axis of the propeller to the bottom edge of the solid mass of the large motor head (that occupies the upper half of an outboard motor)? Thanks for any following-up info in advance. Jay Chan |
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