If you pushed a Dodge Demon out of an airplane...
07-20-2017, 11:03 PM
#21
Race Director
Would it still complete a quarter mile faster than a Z?
If you let a Demon fall from an airplane from a height of exactly 1/4 mile (and ignoring wind resistance), how long would it take to complete the quarter mile, and would it still be faster than the Z?
My guess is right around 9.1 seconds (s = 1/2at^2), but I'm not a math geek. I assumed acceleration is 9.8 m/sec and that the quarter mile is 402 meters.
I think it'd be cool to run a sub-9.1, then, faster than falling!
If you let a Demon fall from an airplane from a height of exactly 1/4 mile (and ignoring wind resistance), how long would it take to complete the quarter mile, and would it still be faster than the Z?
My guess is right around 9.1 seconds (s = 1/2at^2), but I'm not a math geek. I assumed acceleration is 9.8 m/sec and that the quarter mile is 402 meters.
I think it'd be cool to run a sub-9.1, then, faster than falling!
More to the point....if you dropped a c7 z06 a8 out of the airplane would it overheat in 9.1 seconds..
07-21-2017, 09:47 AM
#22
Drifting
Member Since: Jan 2006
Location: Wichita Falls Texas
Posts: 1,972
Likes: 0
Received 67 Likes
on
16 Posts
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17,'22
On a run like this, we were showing 5 1/4 gee during the first second or so, and incredibly still over 1 gee at over 320 MPH.
Lotsa gee while going from zero to 270 mph in 3.0 seconds!
Cheers,
Eddie FourFather Hill
Lotsa gee while going from zero to 270 mph in 3.0 seconds!
Cheers,
Eddie FourFather Hill
07-21-2017, 12:46 PM
#23
E-Ray, 3LZ, ZER, LIFT
Member Since: Sep 2007
Location: NE South Carolina
Posts: 29,498
Received 9,624 Likes
on
6,628 Posts
Even if you ignored wind resistance, which you can't, you have to factor in forward speed of the aircraft.
Any aircraft large enough to ferry the Demon to altitude would be going in excess of 100 mph on jump run. All that forward speed has to transfer into vertical speed, which makes the trajectory an arc, thus it has longer to travel than only 1/4 mile. And how close to terminal velocity would it get by the time it hit the ground? Even a hovering helo would alter the math because of the downforce of the wind generated.
I certainly don't have the math to figure it out, but I do know how things behave in free fall.
Maybe if it was pushed off a cliff (or platform) that was 1/4 mi. high in a vacuum?
Any aircraft large enough to ferry the Demon to altitude would be going in excess of 100 mph on jump run. All that forward speed has to transfer into vertical speed, which makes the trajectory an arc, thus it has longer to travel than only 1/4 mile. And how close to terminal velocity would it get by the time it hit the ground? Even a hovering helo would alter the math because of the downforce of the wind generated.
I certainly don't have the math to figure it out, but I do know how things behave in free fall.
Maybe if it was pushed off a cliff (or platform) that was 1/4 mi. high in a vacuum?
I think!
07-21-2017, 02:32 PM
#24
Le Mans Master
Thread Starter
Anyhow, from what I understand, the G load is much worse on chute deployment than launch, and it's hard on old retinas. Any idea what they pull for negative G when the chutes come out at >300mpg?
Last edited by davepl; 07-21-2017 at 02:33 PM.
07-21-2017, 06:30 PM
#25
Drifting
Member Since: Jan 2006
Location: Wichita Falls Texas
Posts: 1,972
Likes: 0
Received 67 Likes
on
16 Posts
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17,'22
Took me a minute, but I just got the "FourFather" reference (first sub 4?)!
Anyhow, from what I understand, the G load is much worse on chute deployment than launch, and it's hard on old retinas. Any idea what they pull for negative G when the chutes come out at >300mpg?
Anyhow, from what I understand, the G load is much worse on chute deployment than launch, and it's hard on old retinas. Any idea what they pull for negative G when the chutes come out at >300mpg?
Garlits suffered a detached retina when he purposely pulled the chutes before shutting off the throttle.
After that, I adopted a new procedure for stopping after a run:
1. Shut off the throttle about 4 gee negative
2. Pull one chute bumps total gee to about 5
3. Pull the other chute makes about 6 total
So I get three milder hits instead of one giant one.
Cheers,
Eddie FourFather Hill
07-21-2017, 07:20 PM
#26
Le Mans Master
Thread Starter
Wow, so just lifting generates -4G from aerodynamic load, and the chutes only add about -1G each? I had no idea the drag load on the body was that high in a TF car! I guess downforce isn't free...
Last edited by davepl; 07-21-2017 at 07:20 PM.
07-21-2017, 07:36 PM
#27
E-Ray, 3LZ, ZER, LIFT
Member Since: Sep 2007
Location: NE South Carolina
Posts: 29,498
Received 9,624 Likes
on
6,628 Posts
Yes, sir, first in the fours, father of the fours. 4.990 seconds and 288.55 mph, on the day that seemed to demand it- 4/9/88
Garlits suffered a detached retina when he purposely pulled the chutes before shutting off the throttle.
After that, I adopted a new procedure for stopping after a run:
1. Shut off the throttle about 4 gee negative
2. Pull one chute bumps total gee to about 5
3. Pull the other chute makes about 6 total
So I get three milder hits instead of one giant one.
Cheers,
Eddie FourFather Hill
Garlits suffered a detached retina when he purposely pulled the chutes before shutting off the throttle.
After that, I adopted a new procedure for stopping after a run:
1. Shut off the throttle about 4 gee negative
2. Pull one chute bumps total gee to about 5
3. Pull the other chute makes about 6 total
So I get three milder hits instead of one giant one.
Cheers,
Eddie FourFather Hill
Great to see a post from you! I remember you and Ercie when you were racing AA/Fuel, always a great show! Saw Garlits race before he was using a supercharger! He was at the Darlington SC Drag Strip some years back when we had national meets. I mentioned I saw him in Montgomery NY when he was running a brace of '97's. As he was signing his book for me he recalled the exact time from memory! It was in the book and he was right on! Just visited his museum in Ocala!
From, Old Gearhead!
07-30-2017, 11:32 PM
#28
Wow, Eddie Hill! I remember you kicking *** at the Metroplex in the 80s when you first broke 300 at that track. How in the hell did someone running nines end up in the other lane? Hope you are doing well!