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-   -   Sanding a lower unit for speed (https://www.offshoreonly.com/forums/general-boating-discussion/285858-sanding-lower-unit-speed.html)

boating37 02-02-2013 08:59 AM

It would have the same type of look .

jbraun2828 02-02-2013 01:10 PM

I sanded mine down last winter. They discolor after two or there times out but clean very easily with a scotch bright pad and soap and water. no paint on the lower to fall off and I think they look better

boating37 02-02-2013 04:30 PM

Use scotch bright and wd40 and they look like new again.

offshorexcursion 02-02-2013 05:55 PM

Yeah WCM is for sure the place to go but would be nice to know a little more about "blue printing" the lower. Do they sharpen the leading edge? Trailing edge? Bullet? Thin the skeg? Obviously they "true" it and make sure its stright. Sanding strokes front to back? What grit? etc. There are a lot of guys on here that like to build not buy. Its half the fun, especially if you are on a budget.

4bus 02-02-2013 06:42 PM


Originally Posted by offshorexcursion (Post 3860293)
Yeah WCM is for sure the place to go but would be nice to know a little more about "blue printing" the lower. Do they sharpen the leading edge? Trailing edge? Bullet? Thin the skeg? Obviously they "true" it and make sure its stright. Sanding strokes front to back? What grit? etc. There are a lot of guys on here that like to build not buy. Its half the fun, especially if you are on a budget.

I agree. I often wonder how much can be done with a stock bravo lower, however I wouldn't have a clue where to start.

Amazes me how smart most people in the sport are about engines, and how dumb most of us are about hydro dynamics.

abones 02-02-2013 07:17 PM

I know most everyone understands the princpal but originaly we "Massaged" Not "blueprinted" the lowers to gain cleaner water to the small hub props to utilize all of the blade as possable outboard style cleavers, In my opinnion to effectively accomplish this with a bravo one needs to lengthen the bullet much further out than the pre-formed nosecones do. It is a ratio of diameter to length. As we all know this is really make no difference till about 80 mph and above on Vs and mid 90s on most cats.

1989mach1 02-09-2013 10:38 PM

I was looking in to the speed nose cones for the bravos and thay r trying to say a 3 to 6 mph gaine with them. could that be

tomas_wallin 02-10-2013 05:17 AM

I just added a Hydromotive nose cone to my XR lower. It's also straightened, sharpened and a bit thinned.

I also got rid of the lower intake and modified the side intakes to make it work with the prop shafdt depth I'm at (3-1/2")

I'm going to leave it like this with no paint until l have tested.

It's wet sanded just like the bottom to a certain fine grit that according to a VERY reputable European boat designer works the best.
http://i1291.photobucket.com/albums/...psd679886d.jpg
http://i1291.photobucket.com/albums/...ps1f9e9ddd.jpg

offshorexcursion 02-10-2013 08:37 AM

Looks great, thanks for sharing. Would love to know the sanding grit secret :drink: Did it help the bottom of the hull? Always wanted to do the bottom of my hull.

Please update us with results

drpete3 02-10-2013 09:36 AM


Originally Posted by offshorexcursion (Post 3864623)
Looks great, thanks for sharing. Would love to know the sanding grit secret :drink: Did it help the bottom of the hull? Always wanted to do the bottom of my hull.

Please update us with results

Then after u do urs. Come and show me on mine


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