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Conventional V-bottom hydronamics question..........

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Old 12-31-2007, 04:34 PM
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Originally Posted by MOBILEMERCMAN View Post
A bad day boating is always better than a good day inside.
Depends on what you break I'd rather stay home than break a drive or engine!
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Old 12-31-2007, 05:14 PM
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Its still better boating, besides if it was going to break waiting a day or two doesn't make it any easier.
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Old 12-31-2007, 08:14 PM
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Yes but on the smooth side the tile will slide from side to side much easier. America's cup boat spend more money on speed then anyone and they no longer sand the bottoms they make them as perfectly smooth as they can.
maybe for them, but sail boats dont run over 100
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Old 12-31-2007, 08:26 PM
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I have heard of and tried different size pitchs on outers and centers. The problem with outeres being so high is when you turn boat they will cavitate. I went to four blades and problem was non existent.

25" centers would be a lot easier to find.

I want to keep the top of engine cowlings as close to even with each other as possible.

Here's a pict of a new Homeland Security Midnight.
http://www.offshoreonly.com/forums/s...d.php?t=176114

52 ft long.... jackplates..
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Old 01-01-2008, 08:40 PM
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Enforcer2;
I'm going to ditto the info from MOBILEMERCMAN and add this... Ultimately you will check your height by doing your slip calulation. If your percentage slip is much greater than about 15%, than you know to lower that motor.
On a VEE I would try to get the props as close together as possible. I remember when people used to angle the motors on the transom to get them closer at the prop.
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Old 01-01-2008, 09:50 PM
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LOL I've actuall seen one continious jack plate or trips on a Deep Impact
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Old 01-01-2008, 09:55 PM
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This picture is really what I am interested in knowing.

This is an Apace and I know there are obvious differences.

water pickups on transom (CAN get for Outboards), surface propellers( Chopper or Cleaver Props for outboards ), HD drives and tons of Torque (thIs I can't come up with .)

But the realtionship of where the prop shaft is to the notch and the v on the bottom is really what I am after.

SEE PICT and tell me what u think.

Thanks again everyone for the help...............Tony
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Old 01-01-2008, 10:03 PM
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Are you trying to compare apples to oranges?
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Old 01-01-2008, 10:35 PM
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No...of course not but in relationship to the drive height and the notched transom how can I take advantage of my set up and how high should I go.

Do I run prop shafts even with bottom as before with the non notched transom or can I go as high as the above pict and actually see an increase in speed without sacrificing everything else.

It is nothing new for outboards to run much high er than your conventional stern drive boat: IE jack plates in conjuction with chopper props and low water pick ups.
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Old 01-01-2008, 10:43 PM
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Tony, Do you have a rear angle picture of the stern?
As you now that hull has been a round and dialed in again and again. In short you can only raise the drives as high as you can get the props to carry the boat. The faster the boat the less you have to carry. That picture is probably of a 100 mph plus, maybe 110 mph plus boat. Different things apply as speed increases. What works at 80 is not what's best for 100 and vis versa.
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