145+mph

[PANAVIA]

Remember -- in the end ; everything tastes like chicken.

I found something close to what i was looking for. -

http://www.mayfco.com/cobra.htm

scroll down to the charts.



He is using .42 Cd for his calculations which I think is optimistic. -- I think the open cobra is more like a .54-.60 Cd range.

I need to figure out how to figure that out.


--Steve
Rocket Scientist

[Gunner]

Originally Posted by PANAVIA

He is using .42 Cd for his calculations which I think is optimistic. -- I think the open cobra is more like a .54-.60 Cd range.

I need to figure out how to figure that out.

It's pretty hairy math. You have to begin by measuring/calculating the square footage of the frontal area. This is the easy part. One technique is to take a photo, from the furthest possible distance to flatten perspective and the longest lens available to bring the image close, with measuring references in the pic. Print large, outline the car surface, and measure measure measure.

Calculating or even estimating the Cd from there would be... entertaining.

The short way to do it is see if anyone's ever thrown a Cobra into a wind tunnel, or find a similar car that's been tunnel-tested.

.42 doesn't sound too far off, IME. He says "published figure" but doesn't cite the source.

[Dwight]

Tan
Do you know your horsepower?

Dwight

[Tommy]

For comparison, my fastest speed on the front straight at Roebling Road racetrack was about 140 MPH. I exited the turn before the straight at about 100 MPH, accelerated full bore along the roughly 2,000 foot straight before hitting the brakes to slow to about 80 for Turn 1. My car accelerated strongly to near 140, but it felt like it would have taken a lot more straight away to reach 150. Keep in mind that at 140 MPH, you're traveling more than 200 feet per second. If it took 5 seconds to gain another 10 MPH, you'd cover more than 1,000 feet in that time, and your braking point would have to be moved back even farther because of your higher speed.

[Got the Bug]

Originally Posted by Dwight

Tan
Do you know your horsepower?

Dwight

I'm pretty sure Tan has a CHP 427 Street Fighter, which is just under 500 hp.

[tc_sj]

The PO said 515HP, that 's all I know

Originally Posted by Got the Bug

I'm pretty sure Tan has a CHP 427 Street Fighter, which is just under 500 hp.