John Greenwood

Corryong Cup 2017 · Task 3 (Open) (Thu, 12 Jan 2017) · open · ranked #17 · times in Australia/Melbourne (GMT+11)

Scores computed

Made goal in 3:10:45 — 458.2 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 100% of a perfect day, so 1000 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%

35 pilots flew out of 35 present. Nominal launch is 96%, so launch validity is full once 34 pilots are in the air.

Distance validity — the day counts for less if the field as a whole did not get far.100%

Measured against a 50.0 km nominal distance, a 20% nominal goal and a 5.0 km minimum distance. The field flew 44.6 km past the minimum on average, with a best of 70.7 km.

How far the field got — the spread distance validity is computed from, one dot per pilot. 35 pilots flew; you flew 70.7 km, further than 18 of them. The day averaged 44.6 km past the 5.0 km minimum, against a 50.0 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.100%

The fastest pilot took 1:52:25 against a nominal task time of 1:30:00 — the task took as long as it was meant to, so no time devaluation applies.

Points on offer for the day1000 pts

1000 × 1.00 × 1.00 × 1.00 = 1000

Split between the components: 17 of 35 pilots made goal — a goal ratio of 0.49

distance 428.2 · time 500.4 · arrival 71.5

The share each component takes of the day

distance 42.8% · time 50.0% · arrival 7.1%

Distance points

428.2 of 428.2 pts

Full distance — one of 17 pilots in goal

How this works

Task distance70.7 km

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

Scored distance70.7 km

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

Best distance in class70.7 km

Made goal — full available distance points.428.2 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 70.7 km of the class best 70.7 km, worth 428.2 of 428.2.

Time points

15.6 of 500.4 pts

17th fastest of 17 through the speed section

How this works

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

Your speed section time3:10:45

Fastest time in class1:52:25

Set by Steven Crosby — you were 1:18:19 behind.

Time points fall off with the gap to the fastest time15.6 pts

speed fraction = max(0, 1 − ((T − Tbest) ÷ √Tbest)^2⁄3) = 0.0311; × 500.4 available = 15.6 (times in hours)

The curve is the time-points formula — every dot is a pilot, sitting exactly on it. You were 1:18:19 behind the fastest time, which cost 484.8 of the 500.4 time points on offer.

Arrival points

14.5 of 71.5 pts

17th of 17 to the end of the speed section

How this works

Arrival points reward crossing the end of the speed section early relative to the other pilots who reached it.14.5 pts

Reached the end of the speed section 17th of 1717:41:22

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 place14.5 pts

arrival ratio = 1 − (17 − 1) ÷ 17 = 0.059; arrival factor = 0.2 + 0.037·r + 0.13·r² + 0.633·r³ = 0.203; × 71.5 available = 14.5

One place earlier would have been worth 0.3 more points

The curve is front-loaded: first place takes all 71.5 available, and everyone else who reaches the end of the speed section keeps at least 14.5 of them.

The curve is the arrival-points formula — every dot is a pilot, sitting exactly on it. You arrived 17 of 17, worth 14.5 of 71.5 — one place earlier would have been 0.3 more. The order is by the clock at the end of the speed section, not by speed.

Total

458.2 of 1000 pts

How this works

Distance + time + leading + arrival, minus penalties458.2 pts

428.2 + 15.6 + 14.5 ≈ 458.2 — the points above are shown rounded to 0.1; the total is rounded from their exact sum.

Where the points went

Your 458.2 against the 991.3 that won the class.

How this works

Distancelevel

you 428.2, the leader 428.2

Time−484.8 pts

you 15.6, the leader 500.4

Arrival−48.2 pts

you 14.5, the leader 62.7

Penalties−0.1 pts

you −0.1, the leader 0

Behind Steven Crosby−533.1 pts

Most of the gap — 484.8 of 533.1 points — is time-points.

Track data cleaning

2 of 6999 GPS fixes (<0.1%) carried an implausible altitude and were repaired before analysis — flagged by vertical-speed limits (no barometric channel to cross-check). Positions and times are never altered. How data cleaning works

14:56:05 · 1 fix · up to 161 m off
15:12:35 · 1 fix · up to 163 m off

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

Arrival points

Total

Where the points went

Track data cleaning

Terms on this page