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10-14-2020, 02:49 PM | #1 |
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Mineshaft determination
The rule states.
"To decrease the potential for horsepower/index adjustments when favorable atmospheric (i.e. “mineshaft”) and/or track conditions may have contributed to extraordinary performance the NHRA has developed a system to protect the racers’ horsepower/indexes. If at the conclusion of qualifying the first competitor in the bottom half of the field is -.850 seconds or faster under the class index." That seems pretty clear, but how do you determine the split between the bottom half reliably on an odd number of qualifiers. For example: In an 87 car qualifying field is 44 considered the first competitor in bottom half of the field? If you say yes, please show how you come to that conclusion. This is a link to ladder for an 87 car field if that is of any help. Please note the 86 car field directly above it before you answer. http://sacramentoraceway.com/wp-cont...1/Sptm8588.pdf |
10-14-2020, 02:58 PM | #2 |
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Re: Mineshaft determination
I think 45 is the top of the bottom half, because he comes up and runs number 2 on the ladder.
I have no documentation to support this theory, however. |
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10-14-2020, 04:02 PM | #3 |
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Re: Mineshaft determination
Mike is nearly always correct in my experience.
However, I think 44 is first on on bottom 1/2 of the ladder. I will show my work (Like in 3rd Grade) --- 87 divided by 2 = 43 1/2 (arithmetic middle of Field) 44 first on bottom 1/2 of field. Of Course I am generally Wrong! You can verify that with my X-Wife!
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John Irving 741 Stock 741 Super Stock |
10-14-2020, 04:25 PM | #4 | |
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Re: Mineshaft determination
Quote:
For 87 and 88 car ladders the first qualifier in the bottom half is #45.
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Drew Whalen Stk 3186 |
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10-14-2020, 05:00 PM | #5 | |
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Re: Mineshaft determination
Quote:
87 car divided by 2 = 43.5 like you stated this means there will be 44 cars returning for 2nd round. This would make the 45 car the 1st car on the bottom half of the field... We split the field in "half" every round so if all the top qualifiers won the entire TOP half of the field would return for round 2 and the highest qualified car not returning would be the FIRST car on the bottom half of the field... Brad |
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10-14-2020, 07:06 PM | #6 |
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Re: Mineshaft determination
Round up to next even number. Divide by 2 and next number is top of bottom half. 850 under or greater is mineshaft.
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10-14-2020, 08:12 PM | #7 |
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Re: Mineshaft determination
LMMFAO! thanks John!
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Pete Lanciers PAL Automotive Racing Stock 7801 |
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10-14-2020, 08:17 PM | #8 |
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Re: Mineshaft determination
Rule of thumb is the first car on the bottom half will run #1 or #2 qualifier if it’s an odd number. If that car isn’t -.85 then it’s not mineshaft.
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Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird |
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10-14-2020, 08:27 PM | #9 |
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Re: Mineshaft determination
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10-14-2020, 08:33 PM | #10 |
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Re: Mineshaft determination
Don’t Most guys sandbag until they draw a tough heads up?
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Ed Wright 4156 SS/JA Last edited by Ed Wright; 10-15-2020 at 07:38 AM. |
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