Mitch Butler

Corryong Cup 2017 · Task 3 (Floater) (Thu, 12 Jan 2017) · floater · ranked #1 · times in Australia/Melbourne (GMT+11)

Scores computed

Made goal in 40:36 — 241.3 points

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Click any highlighted step in the explanation to see where it happened.

The flight

What the tracklog shows, and which crossings scored.

How this works

Completed the task — full task distance is credited.

Day quality — points on offer

Task validity 25.49% of a perfect day, so 254.9 of 1000 points were available.

How this works

Launch validity — the day counts for less if much of the field never got into the air.100%

7 pilots flew out of 7 present. Nominal launch is 96%, so launch validity is full once 7 pilots are in the air.

Distance validity — the day counts for less if the field as a whole did not get far.28.95%

Measured against a 35.0 km nominal distance, a 10% nominal goal and a 5.0 km minimum distance. The field flew 4.8 km past the minimum on average, with a best of 16.7 km.

How far the field got — the spread distance validity is computed from, one dot per pilot. 7 pilots flew; you flew 16.7 km, further than 6 of them. The day averaged 4.8 km past the 5.0 km minimum, against a 35.0 km nominal distance.

Time validity — the day counts for less if the fastest pilot got round much quicker than the task was meant to take.88.05%

The fastest pilot took 40:36 against a nominal task time of 1:00:00 — 67.7% of nominal.

Points on offer for the day254.9 pts

1000 × 1.00 × 0.2895 × 0.8805 = 254.9

Split between the components: 1 of 7 pilots made goal — a goal ratio of 0.14

distance 177.2 · time 54.3 · leading 13.6 · arrival 9.7

The share each component takes of the day

distance 69.5% · time 21.3% · leading 5.3% · arrival 3.8%

Distance points

177.2 pts

How this works

Task distance16.7 km

The optimized task line — the shortest legal way round the turnpoints.

Scored distance16.7 km

Measured along the optimized task line, up to the furthest point on course.

Best distance in class16.7 km

Made goal — full available distance points.177.2 pts

The curve is the distance-points formula, half of it built from where the field landed out (FAI S7F §11.1.1) — every dot is a pilot, sitting exactly on it. Its steepest stretches are the ones fewest pilots got past, so flying through one is worth more than the same distance somewhere easy. You flew 16.7 km of the class best 16.7 km, worth 177.2 of 177.2.

Time points

54.3 pts

How this works

Time points use the 2⁄3 speed-fraction exponent (the older GAP2016/2018 curve, S7F §11.2).

Your speed section time40:36

Fastest time in class (among pilots who made goal)40:36

Fastest through the speed section — full available time points.54.3 pts

Leading points

0 pts

How this works

Leading points reward flying out front during the speed section — the pilot with the best leading coefficient takes all available leading points, others fall off with the gap.0 pts

Your leading coefficient — the area under your distance-over-time curve, so lower means further ahead for longer1.824

Best in class 0.491.

Leading points fall off with the gap to the best coefficient0 pts

leading factor = max(0, 1 − ((LC − LCbest)² ÷ LCbest)^1⁄3) = 0.000; × 13.6 available = 0

Measured with the classic squared-distance leading coefficient (S7F §11.3.1, the hang-gliding / GAP2016–2018 variant).

The curve is the leading-points formula — every dot is a pilot, sitting exactly on it. Your coefficient of 1.824 against the class best of 0.491 puts you at 0 of 13.6.

Arrival points

9.7 pts

How this works

Arrival points reward crossing the end of the speed section early relative to the other pilots who reached it.9.7 pts

Reached the end of the speed section 1st of 114:58:17

The arrival order is by the clock at the end of the speed section, not by speed — an earlier start gate can put a slower pilot ahead of a faster one here.

Arrival points fall off steeply with each place9.7 pts

arrival ratio = 1 − (1 − 1) ÷ 1 = 1.00; arrival factor = 0.2 + 0.037·r + 0.13·r² + 0.633·r³ = 1.000; × 9.7 available = 9.7

First to the end of the speed section — the full available arrival points.

Total

241.3 pts

How this works

Distance + time + leading + arrival, minus penalties241.3 pts

177.2 + 54.3 + 9.7 ≈ 241.3 — the points above are shown rounded to 0.1; the total is rounded from their exact sum.

Start cylinder (SSS): The circle around the start turnpoint. The race clock begins when you cross it in the required direction, or at the start gate you took.
Speed section: The timed part of the task: from the start to the end of the speed section. Time points are earned here, and only here.
End of speed section (ESS): Where the clock stops — usually a cylinder shortly before goal, so pilots are not racing all the way to the ground.
Optimized task line: The shortest legal way around the turnpoints, clipping each cylinder rather than flying to its centre. Every distance on this page is measured along it.
Made good: How far along that line you got — not how far you flew. Wandering off course adds kilometres to your track but none to your distance made good.
Minimum distance: A floor: a pilot who flies less than this is scored as if they flew it, so a short flight is never worth less than nothing.
Nominal distance / time / goal / launch: What the organiser expected of a good day — a typical task length, duration, share of pilots in goal, and share of pilots launching. They are the yardsticks the day is measured against, not targets anyone must hit.
Validity: How much of a full 1000-point day this task was worth. A day where few launched, nobody got far, or the winner was round very quickly counts for less in the overall standings.
Goal ratio: The share of flying pilots who made goal. It decides how the day's points are split between distance and the other components.
Leading coefficient: A measure of how much of the race you spent out in front, as an area under your distance-over-time curve. Lower is better; the absolute number means nothing on its own, only the comparison does.
Distance difficulty: Hang gliding only: half the distance points are weighted by where the field landed out, so getting past a stretch that stopped many pilots is worth more than easy kilometres.
Jump the gun: Starting before the first start gate opened. Paraglider pilots are scored only to the start cylinder; hang glider pilots take a penalty that grows with how early they were.

The full guide to GAP scoring

The flight

Day quality — points on offer

Distance points

Time points

Leading points

Arrival points

Total

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