PHRF

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1

Is it just me or is PHRF confusing...

What is the usual formula for TOD PHRF or isn't there one. I've built in
c=e-rd into Sailwave but possibly c=e-rd/60 is more usual? Any experts out
there. Looked on USSA site and stayed confused.

Regards,
Colin J

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2

Here in the Pacific Northwet, PHRF ratings were originally given in minutes per mile, but several years ago were changed to seconds per mile (but in Vancouver, we really do time on time corrections!)

Some areas may still use minutes per mile.

···

At 04:41 PM 20/12/01 +0000, you wrote:

Is it just me or is PHRF confusing...

What is the usual formula for TOD PHRF or isn't there one. I've built in
c=e-rd into Sailwave but possibly c=e-rd/60 is more usual? Any experts out
there. Looked on USSA site and stayed confused.

Regards,
Colin J

--
Peter Bennett, VE7CEI Vancouver, B.C., Canada
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver-webpages.com/van-ps

3

I found reference on TOD at:

http://www.ussailing.org/offshore/hcapsys.htm

and it includes........

The basic time-on-distance formula is: TA = ( D x PHRF ) / 60
  TA = Time Allowance in minutes
  D = course length in miles
  PHRF = rating in seconds per mile
Subtracting the time allowance (TA) from the actual time it took the boat to
sail the race (elapsed time or ET) equals the corrected time (CT).
Utilizing PHRF for time-on-time corrections is done by first calculating a
time correction factor (TCF). The simplest way to calculate TCF is; TCF =
600 / (480 + PHRF). Corrected time then equals elapsed time multiplied by
TCF. More Information <../phrf/TOT.htm> on PHRF Time on Time.
The above formulas represent the simplest form of the PHRF system only and
additional information is available from the PHRF Committee
<http://www.ussailing.org/phrf/>. Computer scoring information for PHRF
<http://www.ussailing.org/racemgt/scoring_programs/> is also available.

I can't personally respond to the question so I hope the references
help.....

Nick Puccio
Serenity, E-38

···

-----Original Message-----
From: Colin Jenkins [mailto:colin.jenkins@match-it.com]
Sent: Thursday, December 20, 2001 11:42 AM
To: Sailwave User Group
Subject: [sailwave] PHRF

Is it just me or is PHRF confusing...

What is the usual formula for TOD PHRF or isn't there one. I've built in
c=e-rd into Sailwave but possibly c=e-rd/60 is more usual? Any experts
out there. Looked on USSA site and stayed confused.

Regards,
Colin J

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Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.310 / Virus Database: 171 - Release Date: 19/12/2001

4

Thanks Nick
CJ

···

-----Original Message-----
From: Nick Puccio [mailto:npuccio@hvc.rr.com]
Sent: 21 December 2001 01:20
To: sailwave@yahoogroups.com
Subject: RE: [sailwave] PHRF

I found reference on TOD at:

http://www.ussailing.org/offshore/hcapsys.htm

and it includes........

The basic time-on-distance formula is: TA = ( D x PHRF ) / 60
TA = Time Allowance in minutes
D = course length in miles
PHRF = rating in seconds per mile
Subtracting the time allowance (TA) from the actual time it took the boat
to sail the race (elapsed time or ET) equals the corrected time (CT).
Utilizing PHRF for time-on-time corrections is done by first calculating a
time correction factor (TCF). The simplest way to calculate TCF is; TCF =
600 / (480 + PHRF). Corrected time then equals elapsed time multiplied by
TCF. More Information <../phrf/TOT.htm> on PHRF Time on Time.
The above formulas represent the simplest form of the PHRF system only and
additional information is available from the PHRF Committee
<http://www.ussailing.org/phrf/>. Computer scoring information for PHRF
<http://www.ussailing.org/racemgt/scoring_programs/> is also available.

I can't personally respond to the question so I hope the references
help.....

Nick Puccio
Serenity, E-38

-----Original Message-----
From: Colin Jenkins [mailto:colin.jenkins@match-it.com]
Sent: Thursday, December 20, 2001 11:42 AM
To: Sailwave User Group
Subject: [sailwave] PHRF

Is it just me or is PHRF confusing...

What is the usual formula for TOD PHRF or isn't there one. I've built in
c=e-rd into Sailwave but possibly c=e-rd/60 is more usual? Any experts
out there. Looked on USSA site and stayed confused.

Regards,
Colin J

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Checked by AVG anti-virus system (http://www.grisoft.com).
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