[sailwave] E% C%

Imported from Yahoo
1

Hi Colin,
I mentioned your program to the person who runs the Wednesday Night Races on
Clear Lake near Houston, Texas. In the past 6 years It's grown into a
substantial weekly event - There are an average of 40 boats on the water each
week over the course of a season - (from April to September) These boats are
in 8 fleets. Four are one-design: J/24, J/80, Laser, and Sunfish. The other
four are handicap fleets (two PHRF,one with Spinnaker one without), two US
Portsmouth, (one multihull, the other centerboard boats). When I mentioned the
sailwave program to him the two questions I couldn't answer yes to were:

1. Can it take system time from the computer for timing purposes?
2. Can it tell how many seconds behind on corrected time the 2nd, 3rd, 4th
etc... place boats are?

When I read this message on E% and C%, I thought I's send these thoughts. It
would be helpful for a race committee to be able to say during trophy
presentation (for example) "..And at 3 seconds behind first place, 2nd place
goes to JOE BLOWBOATER!" Additionally, people are constantly asking him how
far out of first they were...

So,I think "seconds behind first" would be more useful than %C.
As for the timing thing, well, I think that might be asking an awful lot. This
is a scoring program, it seems, not a timing program...

The program is great, by the way, I plan to use it to post results for our
Portsmouth fleet races this coming summer... Links to sailwave.com will of
course be there!

Congrats on a great application!
-Bob Hunkins
Clear Lake Sailing Club, Houston, TX, USofA
Webmaster
http://www.clearlakesailingclub.org
participant
http://www.clearlakeraces.com

···

===== Original Message From sailwave@yahoogroups.com =====
I think I can safely say that E% and C% were not one of my best
ideas. I'm going to replace them with a single measure which is how
much faster you needed to go to tie with the winner - taking your
rating value into account; i.e. it's not just a difference of your
and the winners elapsed times. The column name I've come up with
is "-Ewin"; i.e. difference in elapsed to win.

Example for corrected = rating*elapsed

winner elapsed = 100sec
winner rating = 10
winner corrected = 1000sec

your elapsed = 100sec
your rating = 20
your corrected = 2000sec

your elapsed needed to win was 1000sec/20 = 50sec
so your -Ewin is 100sec - 50sec = 50sec.

i.e. your elapsed time was the same as the winners elapsed time
(100sec) but you needed to sail the race 50sec faster to win (tie in
fact).

Similarly, could compute Rwin - the rating you actually needed to win
based on the elapsed time you put in - is that useful?

CJ

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http://www.sailwave.com/

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2

Hi Bob,

Thanks for the email. I do not intend to add timing as you guessed (for
many reasons). However I intend to interface to a program that is
specifically designed for this purpose; I think it's called RaceDay.

I will dump E% C% and add the 'To Win' column (I changed my mind about the
column name) but I think it should be calculated as I mentioned rather then
a difference of corrected times - which is not necessarily meaningful
number... I think... Actually lets play with an example. Say Corrected =
Rating * Elapsed.

A Elapsed = 3600sec
A Rating = 0.95
A Corrected = 4320sec

B Elapsed = 4000sec
B Rating = 0.94
B Corrected = 3760sec

So A is 560sec behind B on corrected time.

But the elapsed time A needed to put in to tie with B is 3760/0.95=3958sec.

So the way I see it, which is not necessarily correct is that A needs to
sail 358sec faster 'to win', not 560sec...

Congrats on a great application!<

Thanks, it's getting there... :slight_smile:

Regards,
Colin

···

-----Original Message-----
From: Bob Hunkins [mailto:rhunkins@pdq.net]
Sent: 27 March 2002 18:23
To: sailwave@yahoogroups.com
Subject: RE: [sailwave] E% C%

Hi Colin,
I mentioned your program to the person who runs the Wednesday Night Races on
Clear Lake near Houston, Texas. In the past 6 years It's grown into a
substantial weekly event - There are an average of 40 boats on the water
each
week over the course of a season - (from April to September) These boats are
in 8 fleets. Four are one-design: J/24, J/80, Laser, and Sunfish. The other
four are handicap fleets (two PHRF,one with Spinnaker one without), two US
Portsmouth, (one multihull, the other centerboard boats). When I mentioned
the
sailwave program to him the two questions I couldn't answer yes to were:

1. Can it take system time from the computer for timing purposes?
2. Can it tell how many seconds behind on corrected time the 2nd, 3rd, 4th
etc... place boats are?

When I read this message on E% and C%, I thought I's send these thoughts. It
would be helpful for a race committee to be able to say during trophy
presentation (for example) "..And at 3 seconds behind first place, 2nd place
goes to JOE BLOWBOATER!" Additionally, people are constantly asking him how
far out of first they were...

So,I think "seconds behind first" would be more useful than %C.
As for the timing thing, well, I think that might be asking an awful lot.
This
is a scoring program, it seems, not a timing program...

The program is great, by the way, I plan to use it to post results for our
Portsmouth fleet races this coming summer... Links to sailwave.com will of
course be there!

Congrats on a great application!
-Bob Hunkins
Clear Lake Sailing Club, Houston, TX, USofA
Webmaster
http://www.clearlakesailingclub.org
participant
http://www.clearlakeraces.com

===== Original Message From sailwave@yahoogroups.com =====
I think I can safely say that E% and C% were not one of my best
ideas. I'm going to replace them with a single measure which is how
much faster you needed to go to tie with the winner - taking your
rating value into account; i.e. it's not just a difference of your
and the winners elapsed times. The column name I've come up with
is "-Ewin"; i.e. difference in elapsed to win.

Example for corrected = rating*elapsed

winner elapsed = 100sec
winner rating = 10
winner corrected = 1000sec

your elapsed = 100sec
your rating = 20
your corrected = 2000sec

your elapsed needed to win was 1000sec/20 = 50sec
so your -Ewin is 100sec - 50sec = 50sec.

i.e. your elapsed time was the same as the winners elapsed time
(100sec) but you needed to sail the race 50sec faster to win (tie in
fact).

Similarly, could compute Rwin - the rating you actually needed to win
based on the elapsed time you put in - is that useful?

CJ

http://groups.yahoo.com/group/sailwave
http://www.sailwave.com/

To unsubscribe from this group, send an email to:
sailwave-unsubscribe@yahoogroups.com

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

http://groups.yahoo.com/group/sailwave
http://www.sailwave.com/

To unsubscribe from this group, send an email to:
sailwave-unsubscribe@yahoogroups.com

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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