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The Alaska
Boating Forum

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mine
Posted by jklingel on Jan 31 2006
First, my understanding is that tunneling is trickier than it looks, so it may be good to go with a motor/tunnel combo that has been working for others. I have a SeaArk 2072 with a tunnel and a 200 hp Merc inboard. It works great, but, yes, it will cavitate when you spin it really quickly at high speed (doing a 360), or plowing through standing waves. (That may just be spinning under too heavy a load, as a prob does, too.) Any jet will; my outboard jet, none-tunneled hull, used to when coming up the Copper. I hear jets do that most any time I hear one in waves. It is very tolerable on my boat and I will not go back to a none-tunneled hull. A welder told me of a company that made a 1" tunnel and it appeared to be THE ANSWER, but it performed poorly till he modified it for the guys. Too, I had ZERO reverse until Karold welded some extensions on the pump's effluent case. I don't think it is quite as good as my outboard jet's reverse was, but it is OK; trade-offs. Do a search here: others have talked about this, too.

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