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Math ....does this look right?
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DRR Sportsman
posted
Trying to figure out how far a car would travel in .004 second at 130mph. I somehow came up with 9.15 inches. Just wondering if that is correct or if it's not even close.
 
Posts: 28 | Location: USA | Registered: February 23, 2000Reply With QuoteReport This Post
DRR Pro
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^^^^^^ Correct !!
 
Posts: 2692 | Location: 53056 | Registered: December 30, 2009Reply With QuoteReport This Post
DRR Pro
Picture of rusty
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my math says same as yours,for certain not sure


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1472 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Sportsman
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Thanks. That verifies that I can't drive for S@#&.
 
Posts: 28 | Location: USA | Registered: February 23, 2000Reply With QuoteReport This Post
DRR S/Pro
Picture of "The Bender"
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Last year I took the stripe by .0001@190mph, best we could figure it was about 5/16"......


272" Spitzer
540 Chevy
The Blower Shop XR1
FTI XPM Series Converter
FTI Level 6 Powerglide
3.69@199
.916 60'

2017 Bradenton Heads Up Madness
Open Outlaw Champ

2018 PDRA T/D #5
2019 PDRA T/D #2

2020 Retired From T/D Competition....

2020 Bradenton NMCA Hemi Shootout Winner

2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass.
 
Posts: 3103 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post
DRR S/Pro
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Speed X 5280 divided by 3600 = distance per second

Therefore 130 mph X 5280 divided by 3600 = 190.66666 ft. per second
19.666 ft. per .10 second
1.9 ft. per .01 seconds
.19666 ft. per .001

Another (faster but not as exact) formula used is speed X 1.47 therefore 130 X 1.47 = 191.1000

Bob
 
Posts: 3216 | Location: Lakeside, Ca | Registered: February 15, 2003Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
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quote:
Originally posted by "The Bender":
Last year I took the stripe by .0001@190mph, best we could figure it was about 5/16"......


Minor quibble but if you took the stripe, your MPH is irrelevant. The trailing car's MPH is what matters.


Tony Leonard
 
Posts: 3253 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post



DRR S/Pro
Picture of "The Bender"
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quote:
Originally posted by Lenny5160:
quote:
Originally posted by "The Bender":
Last year I took the stripe by .0001@190mph, best we could figure it was about 5/16"......


Minor quibble but if you took the stripe, your MPH is irrelevant. The trailing car's MPH is what matters.


Ahh, didn't think of that. He was 184mph


272" Spitzer
540 Chevy
The Blower Shop XR1
FTI XPM Series Converter
FTI Level 6 Powerglide
3.69@199
.916 60'

2017 Bradenton Heads Up Madness
Open Outlaw Champ

2018 PDRA T/D #5
2019 PDRA T/D #2

2020 Retired From T/D Competition....

2020 Bradenton NMCA Hemi Shootout Winner

2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass.
 
Posts: 3103 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
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quote:
Originally posted by "The Bender":
Ahh, didn't think of that. He was 184mph


Only changes it .01". Makes it a little closer to your 5/16", which is pretty much the right fraction to use. Some good work!


Tony Leonard
 
Posts: 3253 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR S/Pro
Picture of "The Bender"
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quote:
Originally posted by Lenny5160:
quote:
Originally posted by "The Bender":
Ahh, didn't think of that. He was 184mph


Only changes it .01". Makes it a little closer to your 5/16", which is pretty much the right fraction to use. Some good work!


Thanks, but my Wife is a teacher, I'll have to credit her with that one...…

She did say it was a little over 5/16"

Just call me stripe hog!


272" Spitzer
540 Chevy
The Blower Shop XR1
FTI XPM Series Converter
FTI Level 6 Powerglide
3.69@199
.916 60'

2017 Bradenton Heads Up Madness
Open Outlaw Champ

2018 PDRA T/D #5
2019 PDRA T/D #2

2020 Retired From T/D Competition....

2020 Bradenton NMCA Hemi Shootout Winner

2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass.
 
Posts: 3103 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post
DRR S/Pro
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Make it easier

17.6 x MPH x MOV in seconds

Also the MPH that should be used is the car that crosses the finish line second, which is not necessarily your MPH!
 
Posts: 2163 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Trophy
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I think it is 1.467 x mov X second cars mph!
 
Posts: 92 | Location: North Carolina | Registered: April 04, 2003Reply With QuoteReport This Post
DRR S/Pro
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quote:
Originally posted by WEH2:
I think it is 1.467 x mov X second cars mph!


Same thing, just one is in feet and the other in inches!
 
Posts: 2163 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Trophy
Picture of fast5982
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TOP 38 has it 100% correct....below is the long version of where the 17.6 comes from

5280/60/60*12=17.6

MOV*MPH*5280/60/60*12

got beat to finish line by .0051

1/4 mile speed of 2nd to finish line 175.966

.0051*175.966*5280/60/60*12 = 15.795 inches behind


*5280 makes miles per hour feet per hour
/60 makes feet per hour feet per minute
/60 makes feet per minute feet per second
*12 makes feet per second inches per second
MOV is what part of a second you were behind

slightly inacurate in that the trap speed is assumed to be the speed during the MOV

This message has been edited. Last edited by: fast5982,
 
Posts: 7 | Location: Dubuque, IA | Registered: April 04, 2000Reply With QuoteReport This Post



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