[sailwave] Average Lap Time Racing

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1

Alan

It really is as simple as that - Sailwave will calculate your scores based on the average lap times.

Regards

Mal

···

To: sailwave@yahoogroups.com
From: alan@activ.co.uk
Date: Fri, 18 May 2007 14:28:29 +0000
Subject: [sailwave] Average Lap Time Racing

Can Sailwave handle scoring on Average Lap Times racing?

Our club is running a 10 hour race with teams of helm/crew with a
single boat (various classes such as RS200, Enterprise, Topper) allowed
for each team.

The scoring will need to be worked out on average laptimes (using same
start/finish line).

Is it simply a matter of entering the total elapsed time and the number
of laps for each boat as they cross the finish line after the 10 hour
duration or is that too simplistic?

Any hints appreciated.

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2

I seemed to remember reading somewhere that there may be a problem
where two boats in the same class have a different number of laps.
Over a 10 hour race it is entirely possible that a slower boat of a
particular class may finish a lap or two behind one of the faster
boats in the same class but seem to higher average lap times.

Is this the case and if so, how would I handle that with Sailwave?

Alan

Alan
It really is as simple as that - Sailwave will calculate your

scores based on the average lap times.

Regards
Mal

To: sailwave@...: alan@...: Fri, 18 May 2007 14:28:29 +0000Subject:

[sailwave] Average Lap Time Racing

Can Sailwave handle scoring on Average Lap Times racing?Our club is

running a 10 hour race with teams of helm/crew with a single boat
(various classes such as RS200, Enterprise, Topper) allowed for each
team. The scoring will need to be worked out on average laptimes
(using same start/finish line). Is it simply a matter of entering the
total elapsed time and the number of laps for each boat as they cross
the finish line after the 10 hour duration or is that too simplistic?
Any hints appreciated.

_________________________________________________________________
Try Live.com: where your online world comes together - with news,

sports, weather, and much more.

···

--- In sailwave@yahoogroups.com, Mal Hartland <malhartland@...> wrote:

http://www.live.com/getstarted

3

It depends on your club SIs - ours don't say anything about that situation
(or anything else for that matter!) so we just enter the elapsed time and
laps live with it. There are some RYA guidelines about tweaking things in
that situation but they are not burned into Sailwave. You could do some
sort of manual adjustment on the elapsed time if really necessary.

Regards,
Colin
www.sailwave.com

···

-----Original Message-----
From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com]On
Behalf Of Alan Jones
Sent: 25 May 2007 14:24
To: sailwave@yahoogroups.com
Subject: [sailwave] Re: Average Lap Time Racing

I seemed to remember reading somewhere that there may be a problem
where two boats in the same class have a different number of laps.
Over a 10 hour race it is entirely possible that a slower boat of a
particular class may finish a lap or two behind one of the faster
boats in the same class but seem to higher average lap times.

Is this the case and if so, how would I handle that with Sailwave?

Alan

--- In sailwave@yahoogroups.com, Mal Hartland <malhartland@...> wrote:

Alan
It really is as simple as that - Sailwave will calculate your

scores based on the average lap times.

Regards
Mal

To: sailwave@...: alan@...: Fri, 18 May 2007 14:28:29 +0000Subject:

[sailwave] Average Lap Time Racing

Can Sailwave handle scoring on Average Lap Times racing?Our club is

running a 10 hour race with teams of helm/crew with a single boat
(various classes such as RS200, Enterprise, Topper) allowed for each
team. The scoring will need to be worked out on average laptimes
(using same start/finish line). Is it simply a matter of entering the
total elapsed time and the number of laps for each boat as they cross
the finish line after the 10 hour duration or is that too simplistic?
Any hints appreciated.

_________________________________________________________________
Try Live.com: where your online world comes together - with news,

sports, weather, and much more.

http://www.live.com/getstarted

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4

Isn't this just the old 'wind died on the last lap problem', aka
'revenge of the slower boats'? Sometimes it picks up instead!
As Colin said, you could always do a fudge, but isn't life too short
for this sort of fiddling about - just maintaining personal handicaps
is enough for me :~
Mike Croker
Lancing SC

···

--- In sailwave@yahoogroups.com, "Alan Jones" <alan@...> wrote:

I seemed to remember reading somewhere that there may be a problem
where two boats in the same class have a different number of laps.
Over a 10 hour race it is entirely possible that a slower boat of a
particular class may finish a lap or two behind one of the faster
boats in the same class but seem to higher average lap times.

Is this the case and if so, how would I handle that with Sailwave?

Alan

--- In sailwave@yahoogroups.com, Mal Hartland <malhartland@> wrote:
>
> Alan
> It really is as simple as that - Sailwave will calculate your
scores based on the average lap times.
> Regards
> Mal
>
>
> To: sailwave@: alan@: Fri, 18 May 2007 14:28:29 +0000Subject:
[sailwave] Average Lap Time Racing
>
>
>
>
> Can Sailwave handle scoring on Average Lap Times racing?Our club is
running a 10 hour race with teams of helm/crew with a single boat
(various classes such as RS200, Enterprise, Topper) allowed for each
team. The scoring will need to be worked out on average laptimes
(using same start/finish line). Is it simply a matter of entering the
total elapsed time and the number of laps for each boat as they cross
the finish line after the 10 hour duration or is that too simplistic?
Any hints appreciated.
>
>
> _________________________________________________________________
> Try Live.com: where your online world comes together - with news,
sports, weather, and much more.
> http://www.live.com/getstarted
>

5

Alan,

Sailwave as others have already stated does not handle this situation. If you want to consider your fudge as has been suggested you may find some guidance at the RYA web site, http://www.rya.org.uk/KnowledgeBase/technical/pys.htm, scroll to the bottom of the page and click on link labelled ‘5. Average Lap Racing’. This document gives a working method to recalculate a result when a boat which has completed fewer laps beats a boat that has done more laps.

Kind regards,

Huw

···

-----Original Message-----
From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com]On Behalf Of Alan Jones
Sent: 25 May 2007 14:24
To:
sailwave@yahoogroups.com
Subject: [sailwave] Re: Average Lap Time Racing

I seemed to remember reading somewhere that there may be a problem
where two boats in the same class have a different number of laps.
Over a 10 hour race it is entirely possible that a slower boat of a
particular class may finish a lap or two behind one of the faster
boats in the same class but seem to higher average lap times.

Is this the case and if so, how would I handle that with Sailwave?

Alan

— In sailwave@yahoogroups.com , Mal Hartland <malhartland@…> wrote:

Alan
It really is as simple as that - Sailwave will calculate your
scores based on the average lap times.
Regards
Mal

To: sailwave@… : alan@…: Fri, 18 May 2007 14:28:29 +0000Subject:
[sailwave] Average Lap Time Racing

Can Sailwave handle scoring on Average Lap Times racing?Our club is
running a 10 hour race with teams of helm/crew with a single boat
(various classes such as RS200, Enterprise, Topper) allowed for each
team. The scoring will need to be worked out on average laptimes
(using same start/finish line). Is it simply a matter of entering the
total elapsed time and the number of laps for each boat as they cross
the finish line after the 10 hour duration or is that too simplistic?
Any hints appreciated.

Try Live.com: where your online world comes together - with news,
sports, weather, and much more.
http://www.live.com/getstarted

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6

I had often to cope with this sort of problem, as race committees usually want to make long races ending at a time there is usually a vanishing wind.

The formula I developped to solve the problem is giving each boat the number of full laps covered during the reference time and a part of a lap at the average speed of this lap.

N= number of laps sailed before the finish

T(N) is the time needed to sail N laps

T(N+1) is the time needed from start time to sail an additional lap.

Then

EN (elapsed number of laps) is N+(T(ref)-T(N))/(T(N+1)-T(N))

If needed CN (corrected number of laps) is EN/TMF or EN*Yardstick/BaseYardstick

If the length of a lap L is known, best replace EN, CN by ED = EN * L and CD = CN * L

Identical boats could always be in reverse order as the facts found on the water, as their speed may vary during a lap, however you can find these facts only if they are exactly on the same tracks, otherwise, halfway between marks upwind, who can say the boat on the right side of the sailing area has a clear advantage on the boat on the left side.

The problem is just decision from authorities, deciding from the office where the problems occur on the water…

Philippe De Troy

···

----- Original Message -----

From:
Huw Pearce

To: sailwave@yahoogroups.com

Sent: Friday, May 25, 2007 6:41 PM

Subject: RE: [sailwave] Re: Average Lap Time Racing

Alan,

Sailwave as others have already stated does not handle this situation. If you want to consider your fudge as has been suggested you may find some guidance at the RYA web site, http://www.rya.org.uk/KnowledgeBase/technical/pys.htm , scroll to the bottom of the page and click on link labelled ‘5. Average Lap Racing’. This document gives a working method to recalculate a result when a boat which has completed fewer laps beats a boat that has done more laps.

Kind regards,

Huw

-----Original Message-----
From:
sailwave@yahoogroup s.com [mailto:sailwave@yahoogroups.com]On Behalf Of Alan Jones
Sent: 25 May 2007 14:24
To:
sailwave@yahoogroups.com
Subject: [sailwave] Re: Average Lap Time Racing

I seemed to remember reading somewhere that there may be a problem
where two boats in the same class have a different number of laps.
Over a 10 hour race it is entirely possible that a slower boat of a
particular class may finish a lap or two behind one of the faster

boats in the same class but seem to higher average lap times.

Is this the case and if so, how would I handle that with Sailwave?

Alan

— In sailwave@yahoogroups.com , Mal Hartland <malhartland@…> wrote:

Alan
It really is as simple as that - Sailwave will calculate your
scores based on the average lap times.
Regards
Mal

To: sailwave@… : alan@…: Fri, 18 May 2007 14:28:29 +0000Subject:
[sailwave] Average Lap Time Racing

Can Sailwave handle scoring on Average Lap Times racing?Our club is
running a 10 hour race with teams of helm/crew with a single boat
(various classes such as RS200, Enterprise, Topper) allowed for each
team. The scoring will need to be worked out on average laptimes
(using same start/finish line). Is it simply a matter of entering the
total elapsed time and the number of laps for each boat as they cross
the finish line after the 10 hour duration or is that too simplistic?
Any hints appreciated.

Try Live.com: where your online world comes together - with news,
sports, weather, and much more.
http://www.live.com/getstarted

--
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7

Further… how to use Sailwave to publish results…

Just when you have calculated the EN with these formulas (I’m using a simple Excel file), you add to this Excel table a field “Average time per lap” = T(Ref)/EN

And you create a Sailwave regatta with start time 0:00:00, finish time = Average time per lap,…

Philippe

···

----- Original Message -----

From:
Huw Pearce

To: sailwave@yahoogroups.com

Sent: Friday, May 25, 2007 6:41 PM

Subject: RE: [sailwave] Re: Average Lap Time Racing

Alan,

Sailwave as others have already stated does not handle this situation. If you want to consider your fudge as has been suggested you may find some guidance at the RYA web site, http://www.rya.org.uk/KnowledgeBase/technical/pys.htm , scroll to the bottom of the page and click on link labelled ‘5. Average Lap Racing’. This document gives a working method to recalculate a result when a boat which has completed fewer laps beats a boat that has done more laps.

Kind regards,

Huw

-----Original Message-----
From:
sailwave@yahoogroup s.com [mailto:sailwave@yahoogroups.com]On Behalf Of Alan Jones
Sent: 25 May 2007 14:24
To:
sailwave@yahoogroups.com
Subject: [sailwave] Re: Average Lap Time Racing

I seemed to remember reading somewhere that there may be a problem
where two boats in the same class have a different number of laps.
Over a 10 hour race it is entirely possible that a slower boat of a
particular class may finish a lap or two behind one of the faster

boats in the same class but seem to higher average lap times.

Is this the case and if so, how would I handle that with Sailwave?

Alan

— In sailwave@yahoogroups.com , Mal Hartland <malhartland@…> wrote:

Alan
It really is as simple as that - Sailwave will calculate your
scores based on the average lap times.
Regards
Mal

To: sailwave@… : alan@…: Fri, 18 May 2007 14:28:29 +0000Subject:
[sailwave] Average Lap Time Racing

Can Sailwave handle scoring on Average Lap Times racing?Our club is
running a 10 hour race with teams of helm/crew with a single boat
(various classes such as RS200, Enterprise, Topper) allowed for each
team. The scoring will need to be worked out on average laptimes
(using same start/finish line). Is it simply a matter of entering the
total elapsed time and the number of laps for each boat as they cross
the finish line after the 10 hour duration or is that too simplistic?
Any hints appreciated.

Try Live.com: where your online world comes together - with news,
sports, weather, and much more.
http://www.live.com/getstarted

--
This email has been verified as Virus free
Virus Protection and more available at http://www.plus.net