Cd and blunt front ends

[Vekke]

Here is my current front bumber setup.
Principle is the same as in basjoos nose...

http://cid-acb1f13bac776768.skydrive...MG%5E_6979.jpg

http://cid-acb1f13bac776768.skydrive...MG%5E_6974.jpg

It took almost 30 hours to get bumber to this stage but its not ready yet.

Future plans is to make air ducting system through the hood like in race cars. Intercooler would be before the radiator and after that straigth outlet through bonnet.

More photos of the bumber and the whole car:
seatti - Windows Live

[aerohead]

Originally Posted by Vekke

Here is my current front bumber setup.
Principle is the same as in basjoos nose...

IMG_6979.jpg - Windows Live

IMG_6974.jpg - Windows Live

It took almost 30 hours to get bumber to this stage but its not ready yet.

Future plans is to make air ducting system through the hood like in race cars. Intercooler would be before the radiator and after that straigth outlet through bonnet.

More photos of the bumber and the whole car:
seatti - Windows Live

I like it,but don't be disappointed if it doesn't spin your head at the gas pump.I believe you will see only modest gain at best.

[Vekke]

First full tank results:

front bumber gain is 2-3 MPG. You can see the results also in my coast down tests. I have only done two coasts with new bumber and weather have not been the best. I will tell the results when I get more data...

If aerohead thinks thats shape is not the best, but maybe the gains come from smaller cooling openings.

[Frank Lee]

bumper.

[Funny]

Nit-Picker.

But seriously, Franks is right, it is BUMPER. Otherwise this thread is going to turn into a BUMMER.

[aerohead]

Originally Posted by Vekke

First full tank results:

front bumber gain is 2-3 MPG. You can see the results also in my coast down tests. I have only done two coasts with new bumber and weather have not been the best. I will tell the results when I get more data...

If aerohead thinks thats shape is not the best, but maybe the gains come from smaller cooling openings.

Automotive engineers would be required to perform immediate back-to-back coastdown tests ( 10 coastdowns with,10 coastdowns without ) on the same day,same track,and no significant weather changes.
This is one reason they've gone to wind tunnels,as they can "control" the "weather" inside.
Outdoor testing is very problematic,requiring extremely sensitive measuring equipment or long-distance testing compared to a representative baseline.
Any change to temperature or barometric pressure can skew results right off the charts.
The "racing" nose on my Honda allowed only a 0.5 mph increase to top speed in the 100-mph region.It would not have shown up at the gas pump.

[ECONORAM]

Originally Posted by aspera

Do you really need a ramp or can you just use a huge splitter? This is one of the biggest around. It's all carbon, but the underside is what's cool. The underside is all foam. They put lots of foam under there and the stuff that hangs too low just gets worn away. The result is exactly the correct ground clearance. No math, no guessing.

That is a good idea. GE does the same thing with the sealing surfaces inside the engine where the fan and compressor blades rub. The material is abraidable (spelling?), so only as much as needs to gets worn away. Presto, perfect seal!

[Hermie]

That looks like a Pikes Peak racer to me. TONS of front downforce on those babies!

If I can get my hand on a fiberglass/carbon fiber hood for a Ford Tempo, I could probably make more aerodynamic hood vents similar to that there.


For my car, I've decided to forgo the blunt air-dammed front end and have a smooth skid-plate-like coroplast pan under the bumper, remove the horizontal stock air dam, and set the end of the coroplast low enough to get the lowest part out of the immediate airstream. I'm also going to be making a small splitter lip to help with reducing lift.

[Frank Lee]

[Cd]

Frank you ******* !

Hermie, why are you so concerned with lift on your car ?