POWER FACTOR

For sportsskytter der vil lidt mere...
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Fatti
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POWER FACTOR

Indlæg af Fatti » 27. aug 2016, 15:21

Er der en venlig sjæl der vil oplyse hvilken afstand kronografen skal stå for at
få det korrekte tal til beregning af Pover factoren.
mvh
Benny :bowdown:

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CQB
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Re: POWER FACTOR

Indlæg af CQB » 27. aug 2016, 17:34

Fatti skrev:Er der en venlig sjæl der vil oplyse hvilken afstand kronografen skal stå for at
få det korrekte tal til beregning af Pover factoren.
mvh
Benny :bowdown:
jeg ved ikke om det kommer sig på mm , men til crono til en match står den ca en meter fra skyderen

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BentxBetjent
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Re: POWER FACTOR

Indlæg af BentxBetjent » 27. aug 2016, 17:46

Jeg er helt sikker på du skal have den ud på minimum 20 meter......... :neutral: :popkorn:
Når statsmænd tyr til vold, er det menneskeheden der lider.
( ͡° ͜ʖ ͡°)


Det tager kun 2 minutter ..........

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Re: POWER FACTOR

Indlæg af Bofhenator » 27. aug 2016, 18:16

5.6 Chronograph and Power Factors
5.6.1 The power factors for each Division are stipulated in Appendix D. One or more official match chronographs
must be used to assist in the determination of the power factor of each competitor's ammunition. In the
absence of chronographs, the power factor declared by a competitor cannot be challenged.
5.6.1.1 The power factor rating to enable a competitor's scores to be included in match results is called
"Minor". The power factor floor for Minor rating, and other specific requirements applicable to
each Division, are stipulated in Appendix D.
5.6.1.2 Some Divisions offer a higher power factor rating called "Major", which enables competitors to
earn more points for peripheral shots on scoring paper targets. The power factor floor for Major
rating, if available, and other specific requirements applicable to each Division, are stipulated in
Appendix D.
5.6.1.3 The associated values awarded for Minor and Major scoring hits are illustrated in Appendices B
and C. The method used to determine power factor is explained in the following section.
5.6.2 The chronograph must be properly set up in accordance with the manufacturer's recommendations and
verified each day by Match Officials in the following manner:
5.6.2.1 At the beginning of the first day of the match, a Range Officer will fire 3 rounds from the supply
of the official match calibration ammunition through the calibration firearm over the chronograph,
and the average velocity of the 3 rounds will be recorded;
5.6.2.2 On each of the following match days, the process will be repeated using the same firearm and
ammunition supply (ideally from the same factory lot);
5.6.2.3 The chronograph will be deemed to be within tolerance if the daily average velocity is within +/-
5% of the average velocity achieved in Rule 5.6.2.1;
5.6.2.4 Should a daily variance exceed the allowable tolerance stated above, the Range Master will take
whatever steps he deems necessary to rectify the situation. A sample form suitable for recording
daily readings appears in Appendix C4;
5.6.2.5 The official match bullet scale(s) should be initially calibrated, in accordance with the
manufacturer's recommendations, when the first squad arrives for testing each day and again
immediately before each subsequent squad is tested (see Rule 5.6.3);
5.6.3 Competitor Ammunition Testing Procedure
5.6.3.1 Ammunition must be tested using the competitor's firearm. Moreover, prior to and/or during
testing, the competitor’s firearm and the component parts thereof must not be altered or modified
in any way from the condition it is being used (or will be used) at the match. Violations will be
subject to Section 10.6.
5.6.3.2 An initial 8 sample rounds for the chronograph test will be drawn from each competitor at a time
and place determined by Match Officials, who may require additional tests of a competitor’s
ammunition at any time during the match.
5.6.3.3 From the 8 sample rounds drawn by Match Officials, 1 bullet is removed and weighed to
determine the actual bullet weight, and 3 bullets are fired over the chronograph. If a competitor has
rounds of different bullet weights in his possession, 8 sample rounds of each may be drawn for
testing. The lowest power factor achieved during testing will be applied to all his scores in the
match. All digits visible on the scales and chronograph displays must be used at face value (i.e.
without rounding or truncation), for the calculation in Rule 5.6.3.5. In the absence of a bullet
puller and scales, the competitor's declared bullet weight will be used.
IPSC Handgun Rules, January 2016 Edition 15
5.6.3.4 If bullet weighing is conducted in advance of a competitor's arrival, weighed bullets must be
retained by the chronograph station with the competitor’s remaining sample rounds, until the
competitor or their delegate has attended the chronograph station and completed testing. If a
competitor challenges the weight of a bullet pre-weighed before his arrival, he is entitled to have
the scales calibrated, and the test bullet reweighed, in his presence.
5.6.3.5 Power factor is calculated using the bullet weight and the average velocity of the 3 rounds fired,
according to the following formula:
Power Factor = bullet weight (grains) x average velocity (feet per second)
1000
The final result will ignore all decimal places (e.g. for IPSC purposes, a result of 124.9999 is not
125).
5.6.3.6 If the resultant power factor fails to meet the declared power factor floor, another 3 rounds will be
fired over the chronograph. The power factor will be recalculated using the bullet weight and the
average velocity of the 3 highest velocity rounds from the 6 rounds fired.
5.6.3.7 If the power factor is still insufficient, the competitor may elect to have his final bullet:
(a) Weighed and, if heavier than the first bullet, the power factor calculation in Rule 5.6.3.5
will be recalculated using the heavier bullet weight; or
(b) Fired over the chronograph and the power factor recalculated using the first bullet weight,
and the average velocity of the 3 highest velocity rounds from the 7 rounds fired.
5.6.3.8 If the resultant power factor fails to meet the Major power factor floor of the relevant Division, the
competitor's scores will be recalculated as Minor, if achieved.
5.6.3.9 If the resultant power factor fails to meet the minimum power factor floor for the relevant
Division, the competitor may continue shooting the match, but his scores will not be entered into
match results nor count for match recognition and awards.
5.6.3.10 If a competitor's ammunition is retested, or if any authorized replacement ammunition is used, and
different power factors are recorded when tested according to these rules, the lower power factor
must be applied to score all courses of fire, including those already completed by the competitor.
5.6.3.11 The scores of a competitor who, for any reason, fails to present his firearm for testing at the
designated time and location and/or who fails to provide sample rounds for testing whenever
requested by a Match Official, will be removed from the match results.
5.6.3.12 If the Range Master deems that a chronograph has become inoperative, and further testing of
competitor’s ammunition is not possible, the power factors of competitors which have been
successfully tested will stand, and the Major or Minor power factor declared by all other
competitors who have not been tested will be accepted without challenge, subject to any applicable
Division requirements (see Appendix D).

Som bekrevet i 5.6.2, det kommer an på....

I dette tilfælde, hvad producenten anbefaler.
/bofh
"never attribute to malice that which is adequately explained by stupidity"
Hanlons razor

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CQB
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Re: POWER FACTOR

Indlæg af CQB » 27. aug 2016, 18:55

jeg kan slet ikke overskue at læse så meget , men til rooster stod crono,en på ca en meter

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Raptor357
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Re: POWER FACTOR

Indlæg af Raptor357 » 27. aug 2016, 21:18

Der står den skal sættes op som fabrikanten foreskriver.
Så den måler ikke V0 som er det som man skal/bør udregne PF efter.
Hvad værre er så er +-5% afvigelse ok set i forhold til målingen første dag.
Men der står intet om hvilke krav der kræves af præcisionen på chronografen.
De fleste chronografer er noget for optimistiske, så hvis der til en match en dag er en chronograf det faktisk måler rigtigt, så er mit bud at flere der forsøger at presse citronen ikke lever op til kravet.
Ved udregningen gives der ikke ved dørene og almindelige regneregler tilsidesættes.

Så det er en stor skøn forvirring af sjusk, manglende krav og ekstremt stramme regler. :alcohol:

Men når det er sagt så burde alt almindelig gængs ammo leve op til kravene. Dog vil .38 Special normalt ikke kunne klare et major krav
Kun mængden af varm luft er begrænsningen på hvor højt politikerne stiger til vejrs

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