Hi Ian,
>> ps. I see the Volvo prize calculation is still being used.
Ah, sorry Ian, I didn't 'recognise' you...
Yeah, I scored the Volvo Youth Worlds here this year (great fun) and met
Fiona Kidd et al WRT next year - I think they are going to use it. I've
tweaked it a bit to show the race scores as well as overall.
http://www.youthworlds.org/docs/uploaded/volvoprize.htm
I hadn't tried running it since your 2002 event, so on day 1 I fired it up
and, arrgh, all points = 0. Fixed it at about midnight that day after a few
beers. I've offered to go to Kingston next year and score the event there,
but there is not really any reason why they should indulge me in that...
Another amusing thing that happened this year was that about 10 mins after
posting the day 2 Volvo scores the French coach strolled up to me and said
"zee volovo trophy scores are not correct - FRA do not have enough points
and GBR and ITA have too many - but hey - don't vorry - zey are always wrong
with zis ISAF software - it is zee same every year... I have zis
spreadsheet, look...". Turned out his spreadsheet was a bit wonky
ISAF software?!
Nice to hear from you again.
Regards,
Colin
www.sailwave.com
PS: do you still have an example of the sailwave style you used for 2002 -
they were very nice results but I can't find them on the web anymore in that
form...
Hi Ian,
See my reply to Mike. I can can generalise the BCR/BCE stuff so
that you
can define how it's calculated youself...
Regards,
Colin
www.sailwave.com
From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com]
On Behalf
Of ianmmann
Sent: 02 August 2006 15:02
To: sailwave@yahoogroups.com
Subject: [sailwave] ESPN (Estimated Speed Potential Number)
included with
Published Results?
Could we consider a BCE/BCR type calculation to be used with
Time on Time
racing based on how a yacht performed within the fleet?
Yachts are always concerned with their "Handicap" no matter what
rating
scheme is being used. In Nova Scotia, Canada we use Time on Time
called ASPN
(Atlantic Speed Potential Number) This directly relates to PHRF by
PHRF =
63,000/ASPN - 400. Essentially a yacht with an ASPN of 125 must
beat a yacht
with an ASPN of 120 by 5% .
When all is said an done the question the yachts always ask
is "What
rating did I sail to?" If I am rated as 125 and I consistently
sail to 119
then either I need to improve my game or my rating is too high. We
call this
figure the ESPN.
First, we pick out the "median corrected time". This is the
corrected time
of the yacht finishing in the middle of the fleet when ordered by
corrected
times. With an even number of finishers, we pick the first of the
middle two
finishers. For example, in races with 9 or 10 finishers, the yacht
finishing
5th on corrected time would have the median corrected time.
The median corrected time is then divided by the elapsed time of
each
yacht, and multiplied by 100, to calculate the "Effective Speed
Potential
Number" (ESPN) of each yacht. The ESPN is the ASPN each yacht
would need to
have for all yachts to finish that race with the same (median)
corrected
time.
The leaders will have ESPNs larger than their ASPNs and the
stragglers
will have ESPNs smaller than their ASPNs, the differences being a
measure of
their performance in that race.
I believe that this ESPN concept of relative performance
feedback would be
something that could apply to any handicap system. In Nova Scotia
we find
that racers use it as a gauge of their team performance. I would
love to
standardize our use of Sailwave but know that the ESPN number is
something
everyone wants to see.
Comments? Feeback? Any support?
Happy sailing
Ian
http://www.poohsticks.ca
http://www.lyc.ns.ca
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