On Jan 22, 10:17*am, wrote:
On Jan 21, 10:20*pm, Pat Russell wrote:

In the IGC rules, the factor applied to your speed or distance is the
ratio of your handicap to the handicap of the best glider at the
contest. *In the US Sports Class, the factor is the handicap itself.

Pat,

When you say "best" glider at the contest , do you mean the glider
that wins the day/contest, or the glider entry having the most weighty
handicap (newer glider having the best performance capability)?

The IGC handicaps are used in an inverse way to the US handicaps,
i.e. the higher the handicap, the faster the plane. The time around
course is multiplied by the handicap before determining speed, rather
than the distance. The handicaps are all "normalized" so that the
slowest plane gets no modification. E.g., if everyone show up in
an LS3, Mini-Nimbus, Mosquito, or ASW-24 (all with the same 1.07
handicap) then everyone is scored directly on speed around course
(no modifications for handicap). If one more person shows up with
a standard Libelle (with a handicap of 0.98) then the Libelle gets
scored with straight speed and everyone else gets their time on
course increased by 1.07/0.98 = 9.18%.

I could be wrong about the exact details, since Strepla (which is
used by scoring in other countries) is not open source, unlike
WinScore.