It really depends on how your boat is set up. CG is very important as well as rake/lift of the props you run. My boat starts slight around 60 and it is gone by 75mph.

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how does one find the CG?

can't imagine having to put the cat on a big titter-totter scale to figure out the CG that way.


if the boat is stern-heavy, does one just keep adding weights in the bow till the desired weight distribution is achieved?


what if the CG is right smack in the middle of the boat. say it's a 30 foot cat, and the CG is 15 feet from the bow (CG is right smack in the middle) that's obviously not a good place for the CG to be at. In this case, where would the ideal location of the performance cat's CG be?






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yep that boat was at cumberland marine right? I went to the add many times when it was for sale LOL. I should really give dewald a call. I know I can do better with different props.

I tested a set of 14.75X34 four blade Dewalds this weekend on my 28 Skater w/ 300xs's. What a great prop. Essentially got rid of the "hop", less buzzing, lifted the stern nicely and increased top speed. Raised the engines to 1.75"(spinning out) and was able to get to limiters at 109.8MPH. Pretty good for the lake conditions and a totally stock new boat and engines, in my opinion. My boat rides completely neutral as rigged - no need for ballast. By the way all, Shaun Torrente came up to Oklahoma to help me with the boat this weekend. I can't say enough about him as a humble yet knowledgeable guy that truly loves our boats. Regarding the Dewald props., Dave is still probably another month out on having ones for our types of boats due to casting issues from his vendor. David.

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What performance upgrades can be made to Merc 300 Promax ( not the 300X )

why is there still such a big demand for the 300 Promax ?

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I'm curious as to how props can remove hop in a cat?






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If I nail the throttles and have my trim just right in the 28 after it get on plane noli it has limited hop, it just powers on though it.

According to my "Man" Shaun, a prop that induces more stern lift will lift the stern up sooner under acceleration which reduces the tendency for bow oscillations up and down because of the tunnel packing air then burping it out. if the stern is already up, lift is continuous and minimal "burping".. hope that makes sense! Feeling it first hand is amazing...David

How about
http://i27.photobucket.com/albums/c1...pse9c49aa6.jpg

Mine starts to hop at 50, stops at 62-65. If a slight turn is started during the acceleration, there will be no hop. Bow lays Down at 70, then the fun begins.