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Note
1: |
The
turnpoints for a multiple lap course must be identical, and flown in the
declared order, for each lap. It is not necessary to declare in advance
how many circuits will be attempted. See also Rule 7. |
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Note
2: |
A
Club Task is one that has been set up by the Club Ladder Steward, on the
ladder web site, in advance of the date of the flight. Such tasks may be
flown in either direction and will always be scored as if pre-declared.
They may be flown in addition to or instead of a pilot's main task. |
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| 5. |
The pilot's word will be accepted for flight times,
rounding TPs and landing positions except that BGA Trophies will only be awarded
in each of the Ladder Competitions with the support of properly
controlled GPS logger evidence. |
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5.1. Start
and Finish |
|
 | A
valid start is made when the glider in free flight either crosses an
imaginary line of length 12km drawn symmetrically through the start
point at right-angles to the track of the first task leg, or leaves a
90-degree sector of infinite size positioned symmetrically towards the
track of the first leg, as for badge flights. If a valid
start is not made, the task will be timed from launch.
|
| A
valid finish is made when the
glider crosses an imaginary line of length 12km drawn
symmetrically through the finish point at right-angles to the
track of the last task leg; or enters a
90-degree sector of infinite size positioned symmetrically away from the
track of the last leg, as for badge flights; or, if
the finish point is on an airfield, when the glider lands anywhere on
the airfield.
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5.2. Turnpoints. |
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In
a single flight, the rounding of turnpoints will conform to the following:
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FAI
90-degree sectors,
as for badge flights.
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| 0.5km-radius
cylinders (“Barrel Sectors”) with
the following provisos:
 |
The
scoring distance will be reduced by 1km per turnpoint. |
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Turnpoints
may not be claimed by pilots not carrying GPS. |
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BGA
Trophies will only be awarded with GPS logger evidence. |
For
the purposes of the ladder, the 0.5km-radius cylinder may also
incorporate a 20km-radius 90-degree sector ("Thistle
Sector"). The same provisos shown for barrel sectors will apply.
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|
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Flights
that use both types of turnpoint will be scored as using 0.5km radius
cylinders for each turnpoint claimed. |
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5.3.
GPS Logger Evidence
|
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GPS
logger files will be accepted provided that
the file is either from a secure logger or has been downloaded to the
satisfaction of the club ladder steward or his deputy who will then record that
the flight has been properly controlled. |
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5.4.
Barographs
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Barograph
traces must be submitted to Club Ladder Stewards for height claims. Logger files
must be uploaded onto the web if pilots intend to submit height claims
online.
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| 6. |
Flights in gliders with
motors are accepted. If the engine is used in flight after the task has
started, the glider is scored to the furthest GPS position logged prior to engine start. If qualifying for a ladder
trophy, GPS logger evidence is required to substantiate whether
or where the engine was used. |
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| 7. |
Declarations must be made
before launching, either electronically into a logger, or in writing and given to an authorised person as
delegated by the club
ladder steward. They must include the start point, up to four turning points and the finish
point. All declared turnpoints must be features shown on 1:50,000 Ordnance
Survey map, and/or sets of coordinates, and preferably be selected from the
BGA List of Turning Points. |
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Note
1: |
Only
one cross-country declaration may be made per flight. If two or more tasks
are declared, full points may not be claimed for any of them. See also the
note regarding multiple laps in Rule 4. |
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Note
2: |
While
any task that includes 4 turnpoints is valid for the National Ladder, it
will almost certainly not be acceptable for an FAI badge or record.
Pilots must study the appropriate regulations for any claim that they
might intend to make beyond that made in the National Ladder. |
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| 8. |
For
undeclared flights up to
four BGA Ladder Turning Points may be used. If any
other point is turned, the nearest BGA Ladder Turnpoint which gives a shorter scoring distance
will be used for scoring purposes.
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| 9. |
The
competition handicap (Si) will apply to all
cross-country tasks.
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| 10. |
Uncompleted
Tasks
|
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A
task is deemed to be incomplete if it is:
| Abandoned: The
pilot did not reach a turnpoint (or even the start) on a declared
task, but continued with the remainder of the task (ie: towards the
next turnpoint) while remaining in soaring flight throughout. There may be no more than one
point of abandonment in a single task.
|
| Terminated: It
is not possible to continue with soaring flight, due to:
| Landing out. |
| Engine Start. |
| Failure to reach a
turnpoint having already used a point of abandonment. |
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10.1.
For
declared tasks the distance achieved is the declared distance less the
portion of the task that was not completed.
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10.2.
For
undeclared flights the full distance counts.
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10.3.
The termination point
or abandonment point of a pre-declared task
may be taken as the furthest recorded GPS position on track for the
purposes of calculating achieved distance. Logger files must be uploaded
onto the web if pilots intend to submit flights online that include GPS
landouts or points of abandonment. |
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| 11. |
Points are given for Cross Country
distance and speed; and for Height
gains.
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11.1.
Full cross-country points plus a bonus are awarded for declared
flights where the declared start, turn and finish points are all rounded in the
declared order AND
the height loss between the start and finish points is the lesser of
1000m or 1% of the distance flown AND
a logger file is posted on the web site.
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11.2.
If the height loss between the start and finish
(or landing) points is greater than 1000m, a handicapped distance penalty
will be applied at the rate of 1km per 10m over 1000m. |
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11.3.
A
proportion of full
points will be given to declared/incomplete
flights where a declaration was made but not achieved. A smaller proportion
will be given to undeclared flights. No
speed points will be awarded for undeclared flights that result in a landout.
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11.4.
Height
points are awarded for gain of height. No points may be claimed for flights above 15,000ft
without oxygen.
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| 12. |
Calculation of
Points
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12.1. |
Cross Country Points
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XC
Points = Distance Points + Speed Points + Completion Bonus |
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Depends
on:
1) the shape of the task
(it's "merit") [shape factor]
2) whether it was declared or not [declaration factor]
3) whether it was "completed" or not [completion bonus factor]
4) the glider handicap
5) distance achieved
6) speed achieved over that distance |
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|
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SF |
Shape
Factor |
|
DF |
Declaration factor |
|
CF |
Completion factor |
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Si |
Glider handicap |
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Dd |
Distance declared |
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Da |
Distance achieved |
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Dh |
Handicapped distance achieved |
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T |
Task time (in hours) |
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Va |
Actual speed |
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Vh |
Handicapped speed |
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12.1.1. |
Shape
Factor |
|
The shape factor is
derived by rules based on the overall geometry of the task rather than the
number of turning points. The
implication is that extra turning points and dog legs which do not affect
the overall feel (or merit) of the task will not
devalue it (by giving it a lower shape factor).
There
are four bases for determining shape factors:
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28%
Triangle basis
If any three of the waypoints can make a 28% triangle whose total distance
is >= 95% of the declared distance. |
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25%/45%
Triangle basis
If
any three of the waypoints can make a 25%/45% triangle whose total distance
is >= 95% of the declared distance. |
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Goal
basis
If the task is not closed
circuit (a goal). A task is
considered closed circuit if the
start and finish points are within 10km of each other. |
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Normal
basis
If
the task does not fit into any of the other basis then its shape factor
is calculated from the ratio of the task length to the length of the
“convex hull” that contains all its points.
This geometry of this results in ratios from 0.5 for a double out
and return to 1.0 for any convex shape.
This range of ratios is then scaled to give shape factors between
0.82 and 1.00. Please see the
examples. |
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|
|
SF |
=
1.08 for the 28% triangle basis
= 1.05 for the 25/45 triangle basis
= 0.82 for the goal basis
= between 0.82 and 1.00 for the normal basis |
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Note
1: |
Example
A pilot declares what is basically a 500k 28% triangle, but must dog-leg
around some airspace which adds 20k to their total distance.
The shape factor will be 1.08, but the total distance will be 520k,
the speed will be calculated over 520k and the flight will be scored as
such. |
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Note
2: |
If
pilots are going for records or badges they must make sure that their
tasks also adhere to the rules for these. |
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12.1.2. |
Declaration Factor
|
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DF |
=
1.00 for declared flights
= 0.60 for undeclared flights |
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12.1.3. |
Completion
Factor |
|
CF |
=
1.10 for completed flights
= 1.00 for uncompleted flights |
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|
|
Note
1: |
Amounts
to a 10% points bonus for completed tasks. |
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Note
2: |
Undeclared
flights are only regarded as completed if they are closed-circuit
(distance between start and finish points is less than 10km) |
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12.1.4. |
Distance
Points |
|
Are
awarded for handicapped achieved distance and are factored by the shape
factor and declaration factor. |
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|
|
Da |
=
distance achieved (marking distance) |
|
Dd |
=
declared distance
= Da for undeclared tasks |
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Dh |
=
Da * 100 / Si |
|
Dpoints |
=
5 * Dh * SF * DF |
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12.1.5. |
Speed
Points |
|
Are
awarded for handicapped speed over the achieved distance, are factored by
the shape factor, declaration factor, handicapped distance flown and are
devalued depending on the fraction of the task that was completed. |
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|
Va |
=
Da / T |
|
Vh |
=
Va * 100 / Si |
|
Vpoints |
=
0.05 * (Vh – 50) * Dh * (Da / Dd) * SF * DF
[Vh > 50]
= zero [Vh <= 50] |
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|
|
Note
1: |
Speed
points cannot be negative. ie: handicapped speeds of less that 50kph will
score zero speed points. |
|
Note
2: |
Speed
points will only be awarded after the flight's logger file has been
uploaded to this website. |
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12.1.6. |
Completion
Bonus Points |
|
For
“completed” tasks a bonus of 10% of both speed and distance points is
awarded. See 12.1.3
for the definition of “completed” and the completion factor. |
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|
Bonus |
=
(Dpoints + Vpoints) * (CF – 1) |
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12.1.7. |
Total
Points |
|
Simply
the sum of the distance, speed and bonus points, rounded to the nearest
whole number. |
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|
Total |
= ROUND( Dpoints + Vpoints +
Bonus ) |
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12.1.7. |
Full
Formula |
|
The
full formula combines all the above: |
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|
XCPoints |
=
ROUND( (SF * DF * CF) * (5 * Dh + 0.05 * (Vh-50) * Dh * (Da/Dd)) ) |
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