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19 - GBR - Cancel 2009 change to Clover Leaf scoring

Proposal from

GBR

Proposal title

To cancel last year's proposal to change the scoring formula for slalom tasks

Existing text

S10 A4 3.C5      PRECISION CIRCUIT IN THE SHORTEST TIME  (‘Clover leaf slalom’)

...

Scoring

Where

tpil =  the measured pilots time (seconds)

m =  the number of missed targets

vpen = the time penalty for each missed target (seconds)

tpen = the pilots time (after penalties for missed targets)

tbest = the best time (after penalties for missed targets)

Q = the task value before normalization

Note:  Spreadsheet formulas:

 tpen:  = _t_pil + m * v_pen_

Q:  = LOG(3 * t_best / (t_pen – t_best – 1))

And same in S10 A4 3.C6, S10 A4 3.C7, S10 A4 3.C9, S10 A4 3.C10

New text

Delete existing text and replace with:

Scoring

N     =   number of targets

T     =   time from first to last target

Q     =   N^3 / T

Pq   =   500 * Q / Qmax

Ps   =   500 – 30 * (T – Tpmin).    Minimum Ps = 0;  if N < 9, Ps = 0.

P     =   Pq + Ps

 And similar in S10 A4 3.C6, S10 A4 3.C7, S10 A4 3.C9, S10 A4 3.C10

Reason

The current scoring formula for slalom tasks that was voted in last year is in my view too complicated and too radical.

Fortunately, there was no FAI Championship in 2010 in which to use this new formula, and it is therefore possible to change it back before it has to be used.

In 2006, a new radical formula was voted in and at the following Worlds in China, the Team leaders tried unsuccessfully to revert to the previous formula.

In 2007, another formula was voted in and used in 2008 and 2009. It was not perfect and there must be a better way to score slalom tasks, but the new current one is not an improvement in any way or shape.

At the 2009 World Championship, the Clover Leaf slalom task showed the top 5 scores in PF1 class as follows:

1=1000, 2=852, 3=844, 4=817, 5=816

With the new current equation, the scores would have been much more punishing:

1=1000, 2=685, 3=676, 4=649, 5= 648

I therefore propose to revert to the previous formula that anyone could use with a simple calculator until a better one can be debated and demonstrated to be an improvement.


Added by Robert HUGHES Last edited by Robert HUGHES on 20 Oct, 2010 09:51. Quick links: http://wiki.fai.org/x/pIFW or 19 - GBR - Cancel 2009 change to Clover Leaf scoring
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