SCUFF OR SPEED COAT????

[2FORCEFULL]

WHATS BETTER ,,, to just sand the bottom and leave it or speed coat???


and also who does it now??

 

[rivergames]

WHATS BETTER ,,, to just sand the bottom and leave it or speed coat???


and also who does it now??

Rolling or spraying a speed coat is as easy as it gets. Just buy a can, rough up the bottom of the boat, and roll it on.

I really want to try the new golf ball texture on a boat. Seams like that would be the best way to go

 

[WTMFA]

Rolling or spraying a speed coat is as easy as it gets. Just buy a can, rough up the bottom of the boat, and roll it on.

I really want to try the new golf ball texture on a boat. Seams like that would be the best way to go

Can't believe builders haven't tried this yet, you would think it would pay off in sales if boat ran better than others

 

[NdaWind]

Tried the golf ball texture on sailplanes with no noticeable difference it was however a bitch to clean

 

[Sharp Shooter]

I really want to try the new golf ball texture on a boat. Seams like that would be the best way to go

New? How many years old can something still be considered new?

 

[Sharp Shooter]

WHATS BETTER ,,, to just sand the bottom and leave it or speed coat???


and also who does it now??

Based on the info from world record setting teams I skipped the speed coat on my Biesemeyer. I still use the graphite for spraying underwater gear, but thats it.

 

[RiverDave]

The only thing speed coat is good for is after you blue print the bottom of a boat it's exponentially cheaper to apply that, then to regel / buff the bottom of the boat..

If the boat is gelled and in good shape, and straight, I wouldn't mess with it at all.. If you got any improvements out of scuffing it or speed coating it I'd be shocked.

RD

 

[j540]

Buffed or polished bottom has more drag than a 120/220 grit bottom with graphite or dark gray primer / Speed coat, Or as Cole use to say
" COLE-Glide" .

 

[Rexone]

I had a conversation not too long ago with Rankin on this subject and he said its worth 2-3 mph in his testing on the SS80. So I guess it depends on if you want every last mph and I'm sure it also depends on the efficiency of your particular boat. A lot of guys use it (racers) as it is a steady seller over the years. For recreational boat probably not worth the bother. We also have used it historically on racing skis, roughed just a bit with good success. It makes a difference in the slip and ride of the ski (effort). But ask 10 people about speed coat and you'll likely get 10 answers that don't match.

 

[white tortilla]

Rolling or spraying a speed coat is as easy as it gets. Just buy a can, rough up the bottom of the boat, and roll it on.

I really want to try the new golf ball texture on a boat. Seams like that would be the best way to go

ive heard from a reliable source that tried this on a superstock and supposedly it slowed it down.

 

[Sharp Shooter]

I had a conversation not too long ago with Rankin on this subject and he said its worth 2-3 mph in his testing on the SS80. So I guess it depends on if you want every last mph and I'm sure it also depends on the efficiency of your particular boat. A lot of guys use it (racers) as it is a steady seller over the years. For recreational boat probably not worth the bother. We also have used it historically on racing skis, roughed just a bit with good success. It makes a difference in the slip and ride of the ski (effort). But ask 10 people about speed coat and you'll likely get 10 answers that don't match.

I went with the same finish that Lance Faulkner, Larry Hamilton and Rankin were doing back when Lance set the SS records.
The only difference is I probably won't ever apply the $kiss coat$.

 

[harlanorrin]

Is anyone going to try FISH SCALES, AGAIN?????????????????
HARLAN ORRIN

 

[Sharp Shooter]

Is anyone going to try FISH SCALES, AGAIN?????????????????
HARLAN ORRIN

How long ago was that tried Harlan?

 

[2FORCEFULL]

I had a conversation not too long ago with Rankin on this subject and he said its worth 2-3 mph in his testing on the SS80. So I guess it depends on if you want every last mph and I'm sure it also depends on the efficiency of your particular boat. A lot of guys use it (racers) as it is a steady seller over the years. For recreational boat probably not worth the bother. We also have used it historically on racing skis, roughed just a bit with good success. It makes a difference in the slip and ride of the ski (effort). But ask 10 people about speed coat and you'll likely get 10 answers that don't match.

the hallett straight bottom runs on a lot of wet surface... you feel the drag in the throttles...

I had one that I did the bottom with 120 grit.. wasn't all just for top end,it made the prop slip numbers better..

 

[harlanorrin]

How long ago was that tried Harlan?

There was a mold built for a flat bottom in the early '60s. I never saw it or heard how it ran.
HARLAN ORRIN

 

[Enen]

Bump.

 

[rvrrun]

Rolling or spraying a speed coat is as easy as it gets. Just buy a can, rough up the bottom of the boat, and roll it on.

I really want to try the new golf ball texture on a boat. Seams like that would be the best way to go

I used to test golf balls on the flow bench, there's science in them dimples.

 

[RiverDave]

Bump.

You looking to try something new Aaron? LOL

RD

 

[Enen]

You looking to try something new Aaron? LOL

RD

No sir. Just reading up on speed coat. Google found this thread, and I figured I'd bump it.

 

[shan]

The golf ball dimples are all about lift and have nothing to do with reduced drag.

 

[Sharp Shooter]

There was a mold built for a flat bottom in the early '60s. I never saw it or heard how it ran.
HARLAN ORRIN

!971 Mize flatbottom.

 

[rvrrun]

The golf ball dimples are all about lift and have nothing to do with reduced drag.

that is entirely untrue.

 

[lenmann]

!971 Mize flatbottom.

Wow! Just when I thought was an fish tale picture shows up.

 

[dryhoze1]

that is entirely untrue.

Id have to agree..


While I'm sure the dimples provide some lift, my piloting experience tells me it does reduce drag. Especially on the back side. Thus providing a longer drive.

On a side note, I rolled my speedcoat on the bottom with a heavy nap roller. Came out awesome :thumbup:

FYI- for those considering. Tractor supply stores sell a black graphite paint. I have used this with great results & 1\4 the price.


Here ya go ~
http://www.tractorsupply.com/tsc/product/ez-slide-graphite-based-coating-1-qt?cm_vc=-10005

 

[shan]

that is entirely untrue.

I probably could/should have worded that differently, they do reduce drag, but they provide a significant amount of lift. I would not put dimples on the bottom of my boat.

 

[rvrrun]

I probably could/should have worded that differently, they do reduce drag, but they provide a significant amount of lift. I would not put dimples on the bottom of my boat.

They provide a significant amount of both. Spheres and cylinders are uniquely suited to dimples. Planar surfaces (like a wing or boat hull) are subject to skin friction drag instead of pressure drag like the golf ball. The dimples create a more turbulent boundary layer which causes a low pressure area behind the ball.

 

[shan]

They provide a significant amount of both. Spheres and cylinders are uniquely suited to dimples. Planar surfaces (like a wing or boat hull) are subject to skin friction drag instead of pressure drag like the golf ball. The dimples create a more turbulent boundary layer which causes a low pressure area behind the ball.

The point is to not create a low pressure behind the ball, it already exists with the smooth sphere. That's what creates the drag - the pressure difference between the front and the rear of the ball. The dimples and the resultant turbulent flow reduces the wake and the low pressure (magnitude, relative to stagnant pressure) behind the ball.

The theory behind all of this has absolutely zero application to the bottom of a boat, and I hate golf.

 

[rvrrun]

Now I screwed up, I meant reduce low pressure.

We did tons of flow bench and dyno testing with dimples on intake/exhaust valves, in the combustion chamber and on the short side radius of the intake port. These changes showed little improvement on the flow bench, but there were gains on the dyno. Maybe something akin to a vortex generator would work on a boat hull.

 

[Carlson-jet]

Speed coat works great on the lawn mower deck. I like Ardies thought on it's way easier/cheaper on a fresh blueprinted bottom. :thumbsup I hadn't thought of that. I would have re gelled and then coated. Years ago when Papp flew out and blue printed my friends Young Blood 19' This must have been the process as I don't recall hearing about it being re jelled.

 

[nrbr]

Cool thread! Tried golf ball finish and it slowed boat down considerably. Best numbers we got were from gelcoat sanded directionaly and waxed with kiss kote

 

[Sharp Shooter]

Cool thread! Tried golf ball finish and it slowed boat down considerably. Best numbers we got were from gelcoat sanded directionaly and waxed with kiss kote

Exactly why I went that direction. Plus, the graphite eventually rubs off where the bunks support the bottom. Thanks for the post streaker. :thumbsup