You first have to remove and paint from either a metal or any other surface
which is done with a paint remover. Then the surface is rough up with a 18
to 24 grit paper, where if you ran your fingers across this surface, it will
cut you.
If the surface is metal, you spray a coat of epoxy primer that is mix with a
epoxy primer at 200 percent. This is very thin which looks like black ink.
This soaks deep into the metal which gives a surface that gives a good bond
to the epoxy resin that is apply to this surface.
Next the carbon fiber is lay on this wet epoxy resin and roll with a rubber
roller. I use the type of roller that is use wall covering. After apply
this first step, the carbon fiber surface will still have a deep waffle
pattern. You can either leave it black or you can spray another thin epoxy
primer and leave it that way, or spray a clear and/or color coat.
This will still leave a waffle or other type of carbon fiber pattern to the
surface. If you want to smooth this surface where the carbon fiber that
does not show any weave, than you must add more epoxy resin to the surface,
let dry until it's tacky and keep on applying more resin for two to three
more coats.
Let the surface dry for at least 24 hours and start to color sand this
surface until there is no more high and low areas on this surface. Apply a
coat of epoxy of primer at 100 percent mix with thinner and color sand it
after it dry for 24 hours. The shoot it with epoxy sealer, color sand,
color coats, color sand, and then your clear coat.
It took me two years, and that's with a in house body man to reshape and
refinish my EV.
Roland
----- Original Message -----
From: "dave cover" <
[hidden email]>
To: "Electric Vehicle Discussion List" <
[hidden email]>
Sent: Friday, October 30, 2009 7:50 AM
Subject: Re: [EVDL] Mythbusters: Golf Ball Effect improves aerodynamics
So how would you apply this to a surface to maintain the correct
"roughness" and yet have a durable surface? If you applied it like
regular fiberglass, wouldn't you end up smoothing it out? Don't know
but I want to. Jerry?
Dave Cover
On Fri, Oct 30, 2009 at 10:30 AM, Roland Wiench <
[hidden email]> wrote:
> Here is a material at: http:www.uscomposites.com/carbonpage.html in a
> certain weave size that is apply to race cars. NASCARs have this material
> right behind the rear window. GT Group 7 cars will have the entire top
> cover with this material which is just clear coated.
>
> Jet fighters may have the under surfaces of the rear elevators made out of
> this material which is only coated with a de-gloss resin.
>
> The size of the carbon fiber looks like in the 17 oz size.
>
> Roland
>
>
>
>
>
>
> ----- Original Message -----
> From: "dale henderson" <
[hidden email]>
> To: "Electric Vehicle Discussion List" <
[hidden email]>
> Sent: Thursday, October 29, 2009 10:55 PM
> Subject: Re: [EVDL] Mythbusters: Golf Ball Effect improves aerodynamics
>
>
> i assume the size of the dimples corresponds to a certain velocity wrt
> effientcy. so what if the dimples had a fractal pattern of larger and
> smaller holes?
>
> harry
>
> Albuquerque, NM
> current bike:
http://www.austinev.org/evalbum/1179> current non-bike:
http://evalbum.com/1581>
>
> --- On Thu, 10/22/09, Jeff Shanab <
[hidden email]> wrote:
>
>> From: Jeff Shanab <
[hidden email]>
>> Subject: [EVDL] Mythbusters: Golf Ball Effect improves aerodynamics
>> To:
[hidden email]
>> Date: Thursday, October 22, 2009, 10:39 PM
>> >
>> > Hey folks,
>> >
>> > Saw an episode of Mythbusters last night - they began
>> by testing if a dirty
>> > car gets better gas mileage than a clean car (based on
>> the assumption of a
>> > dirty car giving a "golf ball effect" - the dimples on
>> a golf ball break up
>> > the airflow and result in better aerodynamics).
>> Well the dirty car got
>> > poorer gas mileage so the initial myth was
>> busted. BUT then they created a
>> > car with a truly dimpled surface that looked a lot
>> like that of a golf ball
>> > (dimples enlarged to the scale of the car) and it
>> improved gas mileage by
>> > 11% over a smooth surface on the same car.
>> Here's a link:
>> >
>> >
http://dsc.discovery.com/videos/mythbusters-dirty-vs-clean-car/>> >
>> > For those who are perhaps up to custom designs, making
>> body panels with a
>> > dimpled surface could potentially improve range.
>> Doing it on the sheet
>> > metal of an existing car would be extremely difficult
>> to do (as they
>> > explained in the episode). They used a clay
>> material added to the outside
>> > of the car for the test.
>>
>> I would guess that improves mileage Only at a particular
>> speed or narrow
>> speed range.
>> And probably worsens it at speeds +/-10mph from that.
>>
>> In our fluids class they showed an experiment that used a
>> blower box
>> with two round holes and suspended above this was a balance
>> beam where
>> you could put two shapes
>> You also could introduce smoke tracers at the center of the
>> airflow for
>> each air stream.
>> One of the tests had two identical lacquered wooden balls
>> at various air
>> speeds. After showing they were aerodynamically equivalent,
>> they took
>> one ball and scratched it at regular intervals with a
>> scratch awl.
>> At low speeds the scratches made horrific added drag. As
>> speed was
>> increased, there was a point where the scale shifted and
>> the drag was
>> considerably less than the smooth ball. Then it went back
>> to being worse
>> again.
>>
>> The smoke revealed what happened. The air separated at the
>> rear of both
>> spheres causing most the drag at higher speeds.
>> The scratches did 2 things. They filled with little rolling
>> tufts of air
>> like ball bearings and they also created little low
>> pressure areas
>> behind that caused the airstream to curve with the back
>> side of the ball
>> and reduce the separation.
>>
>>
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>
>
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