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wow, 400+ pounds, and at only 120 mph ?

 

sounds an aggressive claim,

not to mention the "quality" of the airflow towards the rear of a 7-esque car

 

will be eager to hear about real-world results

cheers

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Never thought of it before..... having some kind of automatic adjustments based on speed and turning of the steering wheel would be the ultimate. Imagine F1 does that, if allowed.

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That is not 400 lbs per wing, that is combined down force between the 2 wings.

178 lbs front/ 229 lbs rear, Duel element w/ nearly 800 sq in. of surface.

The max AOA on these wings is 40 degrees without creating a

stall condition. Of course at that AOA we are talking about

a significant amount of drag and turbulence over the car. But you don't

love a 7 because of its aerodynamics. Even the Atom has very poor aero.

Because of the hp of the car drag is not as much of a concern as down force

Last year at Road Atlanta we turned 175 down the back stretch before cresting the hill

and heading into turn 10a. At that speed the car is nearly impossible to keep planted and under control.

This year we thought it would be wise to beef up the roll cage and wing it to try and keep it attached to the planet.

If you run the numbers (800 sq in) on a piece of 1/2 inch plywood at 120 mph

@ 40 degrees AOA you would be surprised at the results.

 

Here is some thing new we are trying to reduce heat in the cockpit.

Its called Lizard Skin.

 

http://www.usa7s.com/aspnetforum/upload/1991105981_Resized_DSCN6347.jpg

http://www.usa7s.com/aspnetforum/upload/1280113863_Resized_DSCN6349.jpg

http://www.usa7s.com/aspnetforum/upload/597604015_Resized_DSCN6351.jpg

 

Its a Spray-on Ceramic Insulation and Sound Control

# Reduce engine and solar heat transfer by 25-30 degrees or more (we are hoping for more)

# Reduce noise by 10-12 decibels or more

# Protect surfaces from moisture and corrosion

# Withstand temperatures to 500° F. (260° C.)

 

We'll see. We have also used spray in foam insulation (tiger Foam) to try and get the heat down.

 

We will keep you informed if any one is interested.

 

Cheers

Kevin

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7evin:

Some of the better airfoils have lift to drag coefficient of 3. In other words for every 3 pounds of lift you create 1 pound of drag. Do you what it is for your wings?

 

 

:7head:

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We'll see. We have also used spray in foam insulation (tiger Foam) to try and get the heat down.

 

7even,

I've been looking at a product called Fibrox. It's a hi-grade glass insulation/sound-deadener that's used in manufacturing (e.g. between the catalytic converter and the aluminum shell around the converter) of production cars. It's light and really heat resistant (1500 degrees F), has very high insulating value, and does its work as thin sheet (1/4 inch). The downside is that, since it's inorganic/glass, it's not impact resistant. The combination of this insulation covered by Lizard Skin (for protection and additional insulatin+deadening) sounds like a good combination. What'dya think?

Cheers,

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7even,

I've been looking at a product called Fibrox. It's a hi-grade glass insulation/sound-deadener that's used in manufacturing (e.g. between the catalytic converter and the aluminum shell around the converter) of production cars. It's light and really heat resistant (1500 degrees F), has very high insulating value, and does its work as thin sheet (1/4 inch). The downside is that, since it's inorganic/glass, it's not impact resistant. The combination of this insulation covered by Lizard Skin (for protection and additional insulatin+deadening) sounds like a good combination. What'dya think?

Cheers,

 

Hi JohnK,

 

Here is a link to the product that you want to use. It is a good product but can be heavy in certain applications.

http://www.fibrox.com/home.htm

From experience it works very well with a reflective surface of foil (face side) and a thin coat of silicone on the back side which also helps keep it together when flexed.

Hope this helps.

 

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7evin:

Some of the better airfoils have lift to drag coefficient of 3. In other words for every 3 pounds of lift you create 1 pound of drag. Do you what it is for your wings?

 

 

:7head:

 

Hey Bob,

 

I do not have the info in front of me. I will look it up once we have the car ready to be tuned. WestTex is cracking the whip on me to produce, so I'll do it later.

 

Cheers

Kevin

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Please post later how you like the Lizard Skin. I plan on spraying the tub area with Linex which I suppose could be done over Lizard Skin.

 

We rhino lined the interior of the car and put the lizard skin in the engine compartment.

We shall see. We are also looking at heat reflective material.

 

Go easy with linex the weight adds up quick. We put a very thin layer on.

 

Not a big deal if you are not racing and trying save every ounce.

 

Cheers

Kevin

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Here is a link to the product that you want to use. It is a good product but can be heavy in certain applications.

http://www.fibrox.com/home.htm

From experience it works very well with a reflective surface of foil (face side) and a thin coat of silicone on the back side which also helps keep it together when flexed.

Hope this helps.

 

Hi Martin,

This is indeed the manufacturer. I got a sample from the factory in Canada and,

1) "300 Paper" 1/4 inch thick weighs 84 grams per sq foot - I figure around 2 lbs and change for the 12 sq. ft. it would take to do an Ultralite, and

2) if you drop something on it it breaks the fibers - so I can't imagine it living very long without something stout (perhaps Lizard Skin) between it and ordinary road debris.

 

My question is from whom do you source it? The factory told me that their US distributor and value-added supplier is Tritex in SC, and that the smallest quantity was 125 sq. ft, at $2-3 per sq. ft. Since I only need a tenth of this, I was looking for someone to split up a roll with me to save money.

 

Again, my take on this is that it's light and very highly insulating, and sounds like a good partner with Lizard Skin.

 

Cheers,

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Hi JohnK,

 

I worked for a company call Hi-Temp insulation for a while and they used it in a test application and to my knowledge have not used it for anything else due to it being brittle and heavy for what they produce (think Sputnick an that is all I can say). Their are some other insulators that are even better and thinner and lighter but the expence is very high for a automotive use. Moss Motors sells a heat and sound deadening material that works very very well and is easy to use it is called Dynamat and it's part number is 409-026 and is 4 each at 1x3 ft and cost $114.95 which if used correctly should cover the areas you need to protect from heat. They also have so other sutff 409-015 which is sold by the sheet 48"x72" for $38.95 each.

Hope this helps.

 

Martin Keller

Ventura, Ca.

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Yes, please keep me-us informed on this lizardskin sheilding.

we took out the trashy looking aluminized "stuff" we found on the birkin. We have the headers wrapped inside the bodywork but are sure more will be needed. dont want to melt our new shoes!:ack:

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  • 2 weeks later...

Few update pics fuel cells/ dual tank, main and sump tank

 

http://www.usa7s.com/aspnetforum/upload/1549612987_DSC01943.JPG

 

Fuel pumps

 

http://www.usa7s.com/aspnetforum/upload/275430516_DSC01944.JPG

 

rear suspension

 

http://www.usa7s.com/aspnetforum/upload/434426889_DSC01945.JPG

 

carbon fiber dash

 

http://www.usa7s.com/aspnetforum/upload/1147860940_DSC01946.JPG

 

header

 

http://www.usa7s.com/aspnetforum/upload/1162368233_DSC01948.JPG

 

header on car

 

http://www.usa7s.com/aspnetforum/upload/545862251_DSC01949.JPG

 

engine shot

 

http://www.usa7s.com/aspnetforum/upload/1375341888_DSC01950.JPG

 

side view

 

http://www.usa7s.com/aspnetforum/upload/1904362106_DSC01953.JPG

 

rear view

 

http://www.usa7s.com/aspnetforum/upload/332627712_DSC01954.JPG

 

screw actuator for pedal adjustment

 

http://www.usa7s.com/aspnetforum/upload/2011407142_DSC01955.JPG

 

intercooler

 

http://www.usa7s.com/aspnetforum/upload/610814243_DSC01956.JPG

 

Hopefully we can get this thing running this week.

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I remember on your write up you had problems with the previous rear of the car during one of the races. Are you planning on a cooler or something for back there, or figure it was a fluke and not real concerned? Or a completely different rear?

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We changed to a beefier rear diff it has held so far. Hope that it will handel the addidtional power. We may need to get it Cryo treated if we still have issues.

 

Mondo you can see the supercharger down on the bottom right in the engine pic hopefully by end of next week it will be on the dyno and we will have some numbers.

 

The Mocal unit is an engine oil cooler that uses radiator fluid to help keep the oil cool.

 

 

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has that intercooler setup been tried before? it looks like the endtanks are going to impede a lot of air circulation to the radiator.

 

We are really concerned about that ourselves. We specd the core and where we wanted the outlets and they built it with those huge tanks. So we will just have to give it a try. kind of hard to not use such an expensive part. 7s just have such a limited space. We were trying to stay away from water to air intercooler with heat exchanger fluid tank pump and all that hardware. This car is going to be running on Ethanol which should help keep the temps down. We will see. We might have to go with plan B.

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