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Old 04-24-2019, 09:40 AM
ztarum ztarum is offline
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Join Date: Sep 2018
Boat: 2002 Prostar 197 6.0L
Location: Northeast
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Need Prostar 197 hull hook dimensions

I know this has been talked about a lot, but search as I May I can't seem to find the information. I have a 2002 197 (non-hooked hull). I am going to experiment with adding a hood temporarily to see how it improves the slalom wake. I would like to start be replicating the factor hull hook (02 TT and all 03 and later). Can anyone tell me how far forward of the transom the hook starts (run), and how much it sticks down below the hull at the transom (rise)?

I basically need the dimension of the triangle/wedge that makes up the hook. Any help would be appreciated. So far I've found lots of pictures, but no measurements.
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Old 04-24-2019, 08:33 PM
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JohnnyB JohnnyB is offline
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Boat: 2004 Prostar 190
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https://www.google.com/search?source...30.mSwW55IWpgI

Pictures, pictures with scales, a how to, several postings.....

I will try to measure tomorrow pm if no one responds before then



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Old 05-01-2019, 08:38 AM
ztarum ztarum is offline
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Join Date: Sep 2018
Boat: 2002 Prostar 197 6.0L
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I'm still looking for some help on this if anyone has their boat handy.
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Old 05-01-2019, 10:17 AM
88 PS190 88 PS190 is offline
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I think he's looking for a better measurement of the hook - its hard to measure if you don't have two boats side by side to decide on the thickness and length. And length is hard since there is a radius and then its gel coated over the radius.

If I had to do this to my boat I'd take some plywood and cut a template of the back edge of the hull like a L then I'd find a boat with the hook and modify the angle of my template till it slipped over the hook nicely by filing until the hook profile met up.

I suspect you'll find it is about 1.375" long to the radius with a .25" radius making about a 1.25" long overall area, thickness of about .375?
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Old 05-01-2019, 09:03 PM
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ahhudgins ahhudgins is offline
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It takes very little hook to change the hull characteristics. I bought a trim tab to install but I'm going to continue to use my homemade "hook" until it falls off....forcing me to ether drill holes for the tab or have a shop do the hook in fiberglass. I cut a strip of nylon into a wedge and started with a 1/4" trailing edge, 2" from leading to trailing edge, and it covers about 75% of the bottom of the transom.

Mine is a V-drive and 1/4" hook dropped the bow down right out of the hole but it took 4 MPH off the top end. I ended up shaving it down to 3/16" and hit the sweet spot. I was experimenting with the hook due to my Maristar porpoising over 32 MPH with several people in the boat, not wake characteristics.

Just 3/16" was enough to bring the bow down a little bit, make the boat turn flatter, and I didn't lose any top end speed. "Goop" has been holding it for several years.
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Old 05-02-2019, 02:56 PM
ztarum ztarum is offline
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Join Date: Sep 2018
Boat: 2002 Prostar 197 6.0L
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Interesting. How did you shape your nylon strip? I've been looking at flooring transition strips (already a wedge shape) in the approximate size range, which is why I'm looking for some detailed info so I choose the closest one.

I'm specifically looking to improve the wake, which is not great at the moment. My boat is missing the winged rudder it would have come with (to provide some uplift) and now has a straight rudder, so I'm trying to duplicate the factory hull change that wend with the change to the straight rudder. I am also going to try a different prop (Acme 431) and weighting the bow with 100 lbs of shot.
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Old 05-02-2019, 09:53 PM
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ahhudgins ahhudgins is offline
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I got scrap nylon at work and ripped it on a radial arm saw. I never made any wake comparison with and without the wedge installed.
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Old 05-13-2019, 09:26 PM
ztarum ztarum is offline
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Boat: 2002 Prostar 197 6.0L
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I still need help with this. $20 via PayPal for a few pictures with a machinist’s square and some measurements.
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Old 05-14-2019, 09:54 PM
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JohnnyB JohnnyB is offline
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I will try this weekend....no PayPal needed.



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Old 05-18-2019, 11:29 AM
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JohnnyB JohnnyB is offline
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Ok....width measured several places on my 2004 PS 197....i get 2.2 inches in width....basically moved scale along hull until gap disappeared and then measured edge of scale to edge of hull with a caliper

Using a straight edge and measuring gap between edge and hull at the biggest gap, I get .12"

Sooo.....

Hypotenuse is 2.2" and height is .12" to the best of my ability

As others suggested, I would water test some type of mock up..

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