2500 hp 25" track width Loose Salt What could possibly go Wrong?

[jl222]

After Jackson and Mayer   18-71  with mk8 injector

 Yeah right 2500 hp   With no nitro and 3/4 throttle

           JL222

[7800ebs]

2200hp at 6500  60psi  you are so right  .. I need a little more track and rpm   
 


check out Darren's Dyno page of        http://www.dmpeinc.com



http://www.dmpeinc.com/superchargers/index.php/dyno/

[desotoman]

"trial runs at the Bonneville salt flats the DMPE supercharged car ran 322.11 mph in the 2 1/4 mile traps.  This is the third fastest time in history."

Bob,

Congratulations, that is quite an accomplishment. Is the Hot Rod Trophy next? 

Is your blower a High Helix type or one of DMPE's special built for Bonneville application.

Thanks for any help,

Tom G.

[7800ebs]

yea well I don't write websites..



I think High Helix.. But,  Honestly I have no idea..

I do know it runs real good....

So.. the 395 off the track run.. 289mph 1/4    313mph 1st mile     364mph middle mile.. 

so the 1/4 was 30mph off the World Finals... hmm

[robfrey]

Can you tell us what this car weighs?

[7800ebs]

Rob

on that run     3750

Questions.. to ponder  Spirit of America first run with no tail, why did he put a tail on later?

Why did Donald Campbell after he crashed at Bonneville add a tail?

Why did the Danny Boy Apple car (a front engine front wheel drive car) add a tail after they crashed?

What is the cd of a Naca 0012 at zero angle of attack?  .006? .008? .010? 

What is the total drag of a tail with a cd so low?

ponder...

I did say at a Hyatt once..   
 

[7800ebs]

Rob the real question  60% rear .. and about 800hp too much power.. 

[Sumner]

First thanks for all of the pictures.  You should think about moving them also to the build section on this site  .

I noticed front suspension in one.  Does the car still have that and yes the rear-end is huge?  Is the transmission a lenco?

....
What is the cd of a Naca 0012 at zero angle of attack?  .006? .008? .010? 

What is the total drag of a tail with a cd so low?

If the tail was say 2 inches thick by 4 foot tall (.666 frontal area) with a Cd of .010 it would take about 5 HP to move it through the air at 500 mph.  I think you can handle that  .

It is pretty easy to figure using the spreadsheet I have here:

http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html

Use the "HP needed for A Lakester or Car to Run a Certain MPH" one and put in zeros for the tire/wheel data and then where you would put in the body put in the tail alone.  You could also use it to figure HP needed for a wing at a certain speed or your car body.  Figure the 3 separately and then add them together for total HP needed,

Sum

[7800ebs]

Yea there are springs.. in all four corners

B&J trans

regarding tail... I did stay at the hyatt.. 

just trying to stir the mush in peoples heads..

My tail got larger after the backend of my car tried to pass the frontend

That is when I sat down with Robert T Jones by luck.. google him

5 hp  hmm..  how much percentage is that of 1400hp? hmm  to be safe?

 

[Freud]

5 HP is 0.35% of 1400 HP.

Hard to tune for that .

FREUD

[robfrey]

Aircraft designers do drag build ups all the time by adding parts separately. If done correctly, you can expect accuracy within 3%.
Now it is time for you to leave this Cd stuff behind and start talking flat plate drag equivalence. This is a much better measurement
system for figuring out the total force needed to over come drag created when moving a body through the air at a particular speed. This is much more relative to what we are doing.
The correct way to measure aero drag is this formula.
Stagnation drag + Separation Drag + Wetted Area Drag = Total Aero Drag.
The hardest things for us car guys to grasp is that frontal area was not mentioned anywhere in the equation. This is why you could double the width of your tail-fin (if for some reason you wanted to)  and it will not double it's drag.
It sound like you are on the right track back not being afraid to drag those tail feathers through the air. Heck we have two giant tail fins on our car at a full 18% of cord.

[Glen]

Al Teague tried a small wing on his liner and it slowed it down.

[7800ebs]

Al's wing may have been too close to the body.

Frontal area is often missed by guys building cars. I was impressed by the first small car I saw. Don Debrings liner. And that is what I based my car on. Building the smallest car possible. Jacks Nebulous cars are built on the same concept. There does become a point were packaging any smaller becomes very very difficult. We have our 40 lbs of hemi packed into our 5 lb car.

 

[robfrey]

Glen,
There is way more to the story than "went slower with wing",
What supported the wing? Airfoil uprights or round tube with a diagonal brace?
I know that the wing had a 4:1 aspect ratio  but I don't know what the airfoil was or the angle of attack? How much did it slow car and at which angle of attack as I know they tried a couple?
Did the car handle any better?
Need more data.

We now live on a different era where a reliable 2500 to 3000 hp engines is common. Not inexpensive, but common. I say, when we can start using it all, we can scale back on the wings and other methods of downforce.

[Ron Gibson]

More Data:   The wing was close to the body, was mounted on vertical aluminum plate. IIRC,  Al only made one pass  with the wing, was only a couple MPH slower and was on 7 cylinders from the git-go.

Ron