Ultralite under construction

[Mondo]

If you still have that supercharger down low on the left side perhaps you could cut an opening in the aluminum on that side... sort of like caterhams have on their bonnet.

Man, I don't even know if there's 22 inches to work with there.

 

Your definately pushing the limits... might consider upgrading your cage while your at it.

Look forward to another ride if you get out this way again (with the seatbelts on this time).

[7evin]

I think we are going to put it just above the radiator layed back at about 18 to 20 degrees

and run it across the car. We will run a splitter just above the radiator to insure cool air.

This will also allow us to get a bit of ram air effect above 160 mph. Trying to keep the

hood line the same and clean for aero reasons.

Next time I am out your way I would love to go to dinner..... We will drive the cars.

Last time I was so focused on keeping the car in one piece that I did not get the chance to socialize with you like I wanted to.

[rnr]

This will also allow us to get a bit of ram air effect above 160 mph.

 

You guys are nuts!!!:devil:

 

Cant wait to see the results :driving:

[7evin]

Ok after adding a 2.5 gal. oil tank to the car Where O Where can another

2 + gal. tank be added.... ?

I am going to change this things Name from Mojito to the Flying Tank Wagon.

 

We currently have 7 (of course) tanks on board...Yes 7.

 

1 Main Fuel tank (14.5 gal.)

2 Aux 2 gal. sump tank.

3 Over flow tank for radiator (2 pints)

4 Dry Sump oil tank (2.5 gal)

5 Inter-cooler Tank (2+ gal)

6 Dry sump overflow/ breather tank (2 pints)

7 Supercharger oil tank....

 

5 cooler/heat exchangers.

 

1 Inter-cooler

2 Radiator

3 inter-cooler Heat exchanger

4 Mocal oil cooler

5 supercharger oil cooler

 

But no cooler for me or my Beer... Something is wrong with this picture...

 

We may have to go back to the drawing board with this one !

 

Maybe I could slip a beer in the top of the inter-cooler tank when Loren is not looking..

I know it will be receiving plenty of Ice for those 1 mile blast.....

 

Well back to the original question... On top of the transmission is the only place I could come up with.

[Mondo]

I keep thinking of adding a small vent along the back side of the hood's bulge but don't have the nerve to cut it out & what to trim it with (kind of vane in the car's looks department).

 

I think it would help get rid of the hot air... currently everything vents out the bottom pretty much. Kevin, it might help get air over that radiator.

[7evin]

I keep thinking of adding a small vent along the back side of the hood's bulge but don't have the nerve to cut it out & what to trim it with (kind of vane in the car's looks department).

 

I think it would help get rid of the hot air... currently everything vents out the bottom pretty much. Kevin, it might help get air over that radiator.

 

You are right on the money. Getting air back out of the car is as much of a chalenge as getting air into it.

Last year I added Boat vents to the sides of the hood. That was a huge help.

We are currently skinning the bottom of the car and creating vents on the bottom that

will hopefully generate low pressure areas around each vent to help draw a higher volumes

of air out of the car.

We are considering closing the front of the car up more to reduce air flow into the car for this up coming event to decrease drag.

If you look at NASCAR they run a very small opening in the front of their cars.

@ 200 mph you don't need a very big hole for air to move through.

Plus we will only run WOT for less than 30 seconds then we idle back.

 

To everyone that responds to this thread I would like to say thanks. You have all helped to

make this car what it is today. Some times a simple though that you might share big or small triggers a

thought on our end and a scary new brain child is born....

So to all of you I say Thank You so very much ! You have caused more sleepless nights

try to figure this all out than you possibility know.... :D

[WestTexasS2K]

Glad I am not the only one sleeping at night.

[MHKflyer52]

7evin,

Why not make a removable grill section that is shaped to help airflow and to reduce air entering the engine compartment but can be removed for more air flow say when in transit or just out for the fun of it. It could be part of your front wing that you have run in the past and could make your car even more aero than it is.

Also look at what Porsche did to the 914-6 and the later 914's to help with underbody air flow and engine cooling. They placed two little stiff rubber flaps on the bottom of the floor pan to create a slight turbulence that did two things one it helped to get the low pressure under the car to pull more air down from the engine access on top and to help plant the rear on the ground due to the low pressure area it cause at speed which also helps in the down force on the rear of the car.

Just a thought you also might want to dimple the leading edges of the car like a golf ball as that has been proven to help let the car or object push through the air even easier. I think they actually outlawed it in Formula 1 due to that reason.

[7evin]

Hey Martin,

 

Its funny you mention a 914. That was my first car. Bought it when I was 14 out of a barn.

Spent the next 2 years getting it ready for when I would be 16. Spent the next 2 years after

that trying to convince the judge that I really was a good driver..... just fast...

He finally gave me a choice to either sell the car or join the military and leave his state....

So I Joined the Air Force and Kept the car..... By the way I still have that car

 

The front cover we are building is only going to be used at the Texas Mile. I don't ever plan

on going that fast again... I never thought about making it part of the wing. That is a good idea....

I will pass that on to Loren so he can stay up at night and think about it.....

 

I like that dimple idea..... I wonder if anyone makes a dimpled stick on material. That would

be perfect.

Thanks Martin.... If all goes well USA7s and the good ole USA will hold the worlds record

for the fastest 7 type...

[slomove]

......I like that dimple idea..... I wonder if anyone makes a dimpled stick on material. .....

 

Adhesive bubble wrap? Light and dimply.....Not sure if the adhesive would stand up to 200 mph ;-)

 

http://www.usplastic.com/catalog/images/products/packaging/50807p.jpg

[rnr]

I like that dimple idea..... I wonder if anyone makes a dimpled stick on material. That would

be perfect.

 

I believe that the dimples only work for blunt objects like spheres and not for things like airfoil wings: http://www.aerospaceweb.org/question/aerodynamics/q0215.shtml

 

I wonder if Sevens are unaerodynamic enough to benefit

 

Popular mechanics tested a commercial dimpled wrap and found their mileage decreased :http://www.popularmechanics.com/cars/news/4316702

[MHKflyer52]

rnr,

 

You are correct in the fact that dimples do not work on leading edges of wings because the flow of air over the wing surface must be smooth so the air flow will meet at the trailing edge at the same time to create lift by having the air on the top of the wing accelerate causing a lower pressure on top which is what makes the wing lift.

 

In theory when very small dimples are applied to a surface such as a round nose or edge that has air flowing over it and is not a lifting devise the dimples will cause the boundary layer to separate from the surface and cause a small area that the air is not attached to the surface which reduces the friction and thus lets the object move faster due to less friction.

 

A good wax job and clean surfaces will most likely be just as effective in reducing the amount of friction that the air flow will cause but if you’re trying to get the most out of something that is cutting through the air as every little bit helps.

 

Gap seals also help in this reducing drag and turbulences which create parasitic drag and causes objects to go slower through the air. Porsche actually put little brush like things on all the openings of the 550 Spider just to reduce the drag and to keep dirt from getting into different areas and a lot of airplanes still do this in areas were control surfaces have linkage that moves out into the air flow. :driving: :auto:

[7evin]

I spoke to several people about the dimples today. Below 100 mph the effects are minimal.

But above 150 mph they can really make an effect if place correctly. Several racers are

using them. One of my friends that has spent 11 years working in NASCAR, spent days on end working

in the wind tunnel with the Hendricks team thinks it might not be a bad idea to try it.

Kenny Tran gave me the name and # of his sponsor in Dallas who does this kind of

work. I am going to call them today and chat with them about it.

Thanks guys...... I can't wait to try and explain this one to my wife..... Aaaah Honey

I need a golf ball paint job...... Martin said so.... Sorry Martin you may have to take

the heat on this one...... It was your idea....

 

RNR thanks for the refferances and info .... Big help.

 

I liked the bubble wrap idea.... Look guys this thing is fresh out of the box, I haven't even

finished unwrapping it yet.... And don't let me catch anyone popping my bubbles....

Edited September 14, 2010 by 7evin

[MHKflyer52]

7evin,

I will neither deny nor confirm that I suggested the dimples but I do think it is something to look into as long as you have the time and your other half’s backing (AKA the true sponsor)....:rofl:....:driving:

[rnr]

We need lots of pictures of the finished result

[7evin]

3:37 AM Mojito took her first breath with her new power plant...... After being dormant

for 2 years she is alive and breathing fire.... I love the smell of high octane fuel early in the morning......

Hell I love the smell of it any time....

 

Still alot of work to do, but she is running.

[Mondo]

where's the Youtube clip;)

Like RNR said, we need some pics of that engine compartment.

[7evin]

Will upload pics soon....

[7evin]

Ok guys here are a few updated pics.

 

We have really been throwing some time at the air box and the intercooler in the

last few days

 

as you can see we have covered the intercooler tank in lizard skin.

[Mondo]

Man, if you see a few drops of oil under that car it could be a freak'n nightmare finding the coupling...