Dick Heffer

Corryong Cup 2017 · Task 4 (Open) (Sat, 14 Jan 2017) · open · ranked #6 · times in Australia/Melbourne (GMT+11)

Scores computed

Made goal in 56:53 — 357.6 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.

Crossed the start cylinder boundary 5 times. The scored start is the latest crossing from which the flight still makes its best run along the course — re-starting supersedes an earlier start, while simply flying back through the cylinder later in the task changes nothing.

The 13:56:04 crossing is the scored start. By the 14:07:56 crossing the flight had already reached TP2 (KANGCK), so treating that as a re-start would mean flying the course again from there — a shorter, later run that scores less.

Completed the task — full task distance is credited.

Day quality — points on offer

Task validity 44.71% of a perfect day, so 447.1 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%

26 pilots flew out of 26 present. Nominal launch is 96%, so launch validity is full once 25 pilots are in the air.

Distance validity — the day counts for less if the field as a whole did not get far.60.45%

Measured against a 50.0 km nominal distance, a 20% nominal goal and a 5.0 km minimum distance. The field flew 16.3 km past the minimum on average, with a best of 28.1 km.

How far the field got — the spread distance validity is computed from, one dot per pilot. 26 pilots flew; you flew 28.1 km, further than 14 of them. The day averaged 16.3 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.73.97%

The fastest pilot took 46:45 against a nominal task time of 1:30:00 — 52% of nominal.

Points on offer for the day447.1 pts

1000 × 1.00 × 0.6045 × 0.7397 = 447.1

Split between the components: 12 of 26 pilots made goal — a goal ratio of 0.46

distance 196.2 · time 219.6 · arrival 31.4

The share each component takes of the day

distance 43.9% · time 49.1% · arrival 7.0%

Distance points

196.2 pts

How this works

Task distance28.1 km

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

Scored distance28.1 km

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

Best distance in class28.1 km

Made goal — full available distance points.196.2 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 28.1 km of the class best 28.1 km, worth 196.2 of 196.2.

Time points

146.7 pts

How this works

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

Your speed section time56:53

Fastest time in class46:45

Time points fall off with the gap to the fastest time146.7 pts

speed fraction = max(0, 1 − ((T − Tbest) ÷ √Tbest)^2⁄3) = 0.668; × 219.6 available = 146.7 (times in hours)

The curve is the time-points formula — every dot is a pilot, sitting exactly on it. You were 10:08 behind the fastest time, which cost 72.9 of the 219.6 time points on offer.

Arrival points

14.7 pts

How this works

Arrival points reward crossing the end of the speed section early relative to the other pilots who reached it.14.7 pts

Reached the end of the speed section 5th of 1214:52:58

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 place14.7 pts

arrival ratio = 1 − (5 − 1) ÷ 12 = 0.667; arrival factor = 0.2 + 0.037·r + 0.13·r² + 0.633·r³ = 0.470; × 31.37 available = 14.7

One place earlier would have been worth 3.1 more points

The curve is front-loaded: first place takes all 31.4 available, and everyone else who reaches the end of the speed section keeps at least 6.4 of them.

The curve is the arrival-points formula — every dot is a pilot, sitting exactly on it. You arrived 5 of 12, worth 14.7 of 31.4 — one place earlier would have been 3.1 more. The order is by the clock at the end of the speed section, not by speed.

Total

357.6 pts

How this works

Distance + time + leading + arrival, minus penalties357.6 pts

round(196.2 + 146.7 + 14.7, 1 dp) = 357.6

Where the points went

Your 357.6 against the 441.8 that won the class.

How this works

Distancelevel

you 196.2, the leader 196.2

Time−72.9 pts

you 146.7, the leader 219.6

Arrival−11.4 pts

you 14.7, the leader 26.1

Behind Hughbert Alexander−84.2 pts

Most of the gap — 72.9 of 84.2 points — is time.

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

Terms on this page