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Thread: Add on lifting strakes
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09-19-2017, 09:15 AM #1
Add on lifting strakes
I`m thinking of adding some lifting strakes to the bottom of my Riot because it rides to nose high and to much wetted boat at the rear. Not enough tail lift. The Riot came from the Eliminator Scorpion which started life as a jet boat. When converted to outboard use Eliminator didn`t change the transom for more tuck or make bottom changes either. I know Mr Ron Baker did some mods to the Scorpion bottom that made it better then carried those changes over to the Riot but it still rides tail heavy. I`m thinking there`s more speed there if I can air the rear of the boat out some more.
I know what I`m going to do but not sure about what material to make the strakes out of. Any ideas?
DB
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09-21-2017, 02:24 PM #2Scream And Fly VIP
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for testing purposes you can use pvc trim board, its easy to shape and you can glue it to the hull. this way when you have what works you can duplicate it in fiberglass. I would say coosa board glassed over should work well or consider making a simple mold. you might be able to use the same mold for both sides of the boat
Raybo Marine http://www.raybomarine.com/
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XstreamVking, Instigator liked this post
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09-22-2017, 07:42 AM #3
PVC trim board? Is that something like house trim? Maybe something I can find at Home Depot? I like that idea. Thanks.
DB
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09-22-2017, 08:23 AM #4Scream And Fly VIP
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yes some boards are stiffer than others try a lumber store they tend to have better quality stuff
you really only need one boardRaybo Marine http://www.raybomarine.com/
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09-25-2017, 04:01 PM #5
What glue do you use?
Some wood might do the trick too.
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09-25-2017, 04:29 PM #6Screaming And Flying!
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Better use some real good glue. Having one come off at speed could be tricky....
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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09-26-2017, 08:25 AM #7Scream And Fly VIP
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sand/grind the boat a little, you can get pre thickened epoxy in a standard caulking gun cartridge and set it up with that
you can of course use wood but the pvc board is easier to shape and work with and you can make the strakes from that as well later on so long as you glass over itRaybo Marine http://www.raybomarine.com/
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09-26-2017, 05:16 PM #8
Sounds like a good plan. I`ll post my results.
DB
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09-27-2017, 07:18 AM #95000 RPM
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My boat bottom is complex with a couple of steps. I made up a basic mold out of aluminium angle. I waxed it, glassed it, filled the void with Epoxy and filler, then glassed the top. I glued these on with epoxy with filler to the hull while the hull was upright on trailer using jack stands to hold up in place, and tidied up the installation with fillets and filler to blend into the hull. Really happy with the result. Sorry, no pics of installed strakes. In the second pic, you can see that I glassed in a split pin so that I could tie a cable to it so it wouldn't be lost if they fell off during testing prior to final installation (never ran them prior to final fitment so cut out and filled). In the last pic, you can se that they were very flexible prior to installation.
Last edited by Primal 98; 09-27-2017 at 07:22 AM.
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bigboy thanked for this post
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09-27-2017, 08:12 AM #10
Aluminum angle for a mold. That's a good idea. That`s why I started this thread. Thanks
DB
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10-24-2017, 12:07 AM #11
So DB have you made some yet?
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10-24-2017, 08:00 AM #12
Nope. Waiting for boating season to end. Don`t want to disable my lake ride just yet.
DB
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10-24-2017, 12:33 PM #13Screaming And Flying!
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They make fiberglass angles that would speed up the process somewhat. http://www.libertypultrusions.com/pu...oducts/angles/
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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10-26-2017, 08:30 AM #14
I added strakes to my 24 Skater (why? cause when Doug Wright sugests something you do it). I had a local boat builder setup a jig to cut 1” high density composite on the Angle I needed then glasses it to the bottom. Made for a very easy install with minimal faring.
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Instigator, NICE PAIR liked this post
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10-26-2017, 05:29 PM #15
Unless you get advice from someone like Kevin did, I'd do temporary install first.
I made/installed a set on a bow heavy (first) ski boat I had and it ran like crap! I peeled them off at the ramp and threw them away!
What your trying to do should be easier but angle changes a bunch.
Look at them at their begginings at the bow of various boats.
Some are almost horizontal while others follow the curve of the keel towards the bow and curve/bend up.
I'm infactuated by them and did a bunch of reading about them on offshoreonly.com over beers one night.
The story concluded (by knowledgeable guys) saying he thought they were invented to keep the Cubans from keep from sliding off the molds while waxing them ������
Bobby, if you get the strakes flexible enough you can duct tape them on to test.
Thats what I did and we did same on the kneel down race boats we were building in Houston, and same for lifting pads.Last edited by Instigator; 10-26-2017 at 05:49 PM.
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