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-   -   Bravo one modifications (https://www.offshoreonly.com/forums/drives-lower-units/380203-bravo-one-modifications.html)

im MartinB 08-10-2023 09:48 PM

Bravo one modifications
 
I am "blue printing" my bottom while I wait for new lifters to get here. I have been planning to install a set of nose cones on my Bravo lowers and i'm wondering if anyone has removed the skegs and to what effect... I don't care about prop protection or affects on low speed steering I am only interested in reducing drag. All my "science" tells me that removing transom lift and possibly lowering prop slip a little bit would be positive. Please .... notice I've said please... Assume i'm right about this and simply address the question relating to the skegs... Does anyone have any experience? I've been on boats with out skegs or mostly without and steering wasn't affected that I noticed. They just didn't go nearly fast enough to have any significant impact and none of those boats would even have benefited much with a little less bow in the water. I've removed roughly 300 pounds from the engine compartment and I am trying now to take advantage of this helping the lighter load still set down in the water and affect the attitude. I hate the look of these nose cones and the amount of time it takes to get them all purdied up again after installing just to have a much bigger under water foot print... wondering it maybe I can get close to the same results minus the cone with some tweaks...

JaayTeee 08-11-2023 05:37 AM

What’s the boat and how fast ?

Plowtownmissile 08-11-2023 08:11 AM

On top of what JT asked, what is your X-dimension on the boat?

JaayTeee 08-12-2023 07:20 AM

If it’s a straight v, taking 300#s out of the rear isn’t going to help with getting
the bow out of the water, I can tell you that taking nose cones off of a low 90 mph boat didn’t change top speed but did add 3 mph to a 3500 rpm cruise speed.

I really doubt there’s a noticeable speed gain to be found by removing skegs

im MartinB 08-21-2023 11:20 PM


Originally Posted by JaayTeee (Post 4876286)
What’s the boat and how fast ?

31 Sonic 88mph. Its a 96 and the drives are quite deep. The weight will be "adjusted" when the batteries are moved aft I've just been working on other things. Just by chance we had a customer come in last week who ran over a concrete break wall at some entrance to the St claire river. I am in the process of using those nose cones to check exactly how much "extra" aluminum there is that can be removed. It's a lot. And since it's both sides I can't imagine it wont reduce transom lift. I've had several people tell me that high performance lowers will add top speed... Imcos or Sport master... I have several Bravo one lowers to mess with and both the ones on the boat now have minor damage from hot boat last year... so I'm just gonna do it. The math says if I can reduce the drag on these lowers I'll have less bow in the water.... I can trim the gauges up to 9 and nothing slips... Fastest speed was in ideal conditions and I didn't even know until later that night when I pressed the tell tale. I've already removed the hook from strake to strake and left the fairly significant hook alone for now between the chime and said strake.

im MartinB 08-21-2023 11:23 PM


Originally Posted by JaayTeee (Post 4876359)
If it’s a straight v, taking 300#s out of the rear isn’t going to help with getting
the bow out of the water, I can tell you that taking nose cones off of a low 90 mph boat didn’t change top speed but did add 3 mph to a 3500 rpm cruise speed.

I really doubt there’s a noticeable speed gain to be found by removing skegs

I've adjusted my plan to cut the front edge back a 1/3 and then trim the bottom 2" off. I'm doing as much as I can to hopefully free up the bow a little more.

smokediver 08-22-2023 04:14 PM

Wilson custom marine. They blueprint lowers among other things.

JaayTeee 08-22-2023 06:51 PM

What are you running for prop rotation?

im MartinB 08-22-2023 08:50 PM

Spinning them out the boat settles down at lower speeds and top speed is the same. If I spin them in the boat is much more prone to start porpoising. I'm in the process right now of finishing the bottom and I did the drives too. I'm planning to try spinning them in again to see what effect true bottom has on the results.

im MartinB 08-22-2023 08:58 PM

https://cimg9.ibsrv.net/gimg/www.off...35765a7baf.jpg
chop chop

Originally Posted by im MartinB (Post 4877347)
I've adjusted my plan to cut the front edge back a 1/3 and then trim the bottom 2" off. I'm doing as much as I can to hopefully free up the bow a little more.

https://cimg1.ibsrv.net/gimg/www.off...793d2b5f22.jpg
https://cimg3.ibsrv.net/gimg/www.off...e4ced85b98.jpg


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