||The Hong Kong Radio Control Soaring Society
HKRCSS F3F League
Rules and Contest Arrangements
Revision 6.2 / December 2017
1. League Schedule
1.1, Number of races
Hong Kong F3F League is an annual league starts in January and end in December of each year. The competition consists of 2 sessions: January to June (session 1) and July to December (session 2).
9 dates are scheduled and a maximum of 6 competitions will be held in each session. The 2 sessions make up of the final results of the year.
The league schedule is announced in advance for a 2 weeks consultation period prior to the start of the league. Once the schedule is set,
change of a race date is not allowed unless it is found coinciding with International FAI F3F contests (Note 1) later and a new race date will be announced for consultation as soon as possible (Note 2).
1.2, Cancellation of a race
In case of poor weather, the race shall be cancelled. There will be no make-up race for the cancelled or imcompleted race. CD shall have the sole power to cancel a race.
Here are some guidelines for cancelling a race:
a, Decision of cancellation is based on if the weather of the day can support 4 rounds of competition or not. CD can delay the starting time of the race for weather condition.
If possible, CD should announce the change of race schedule as soon as possible.
b, Try to seek help from experienced pilots for difficult weather conditions.
1.3, Incomplete races
A race is said to be incomplete if less than four rounds are successfully run on the race day. There will be no continuation race and all the scores for the completed rounds will be discarded and
voided. Slope and personal best times will be kept as official record even the race is incomplete.
2, League Result
2.1, Scoring for the league
A minimum of one league race and a maximum of 12 league races should be conducted. Depending on the number of successful races held,
there will be a corresponding number of discards for a pilot's worse scores according to the following table:
|Number of successful races held
||Number of discards
All completed races after discarding the worse races according to the above table will be counted towards the ranking list.
A pilot’s score in a race is computed by normalizing his own score by the best score of this race and multiplying the result with 1000 points.
The computation is similar to F3F scoring.
2.2, Participation in International F3F contests
League results will be used to qualify pilots who can represent Hong Kong for International F3F contests (Note 1). For each International F3F contest,
the 6 successfully held league races prior to the contest registration deadline will be used for the qualification. (The last race will usually be the
one a few months before the contest deadline to account for the necessary working time. This will be announced for each International contest as soon as possible.)
For each pilot, the best 5 races out of the 6 will be used as the personal result. Pilots have the highest score will be qualified for the International contest.
In case if a qualified pilot relinquishes his right, the pilot next on the line will be qualified.
The qualification of each International F3F competition is independent to each other. This means a pilot qualified for one International contest will not
automatically disqualify him from another International contest.
All qualified pilots must be local pilots who hold a Hong Kong ID card.
3. Race Rules
3.1, FAI rules
All races follow the current FAI F3F published rules. Please see the FAI F3F Rules.
3.1.1, About the models used
Model checking and registration are not necessarily to be carried out before each competition. However, the FAI requirements of model design must be strickly observed
and the CD can check a model at any time during the competition if suspected.
Sharing of one model between two or more competitors is not allowed.
3.1.2, About practice flights before competitions
Unless otherwise agreed by the CD, no flying of any kind is allowed after the preparation team arrived the flying site and before the competition.
Failed to follow the instruction of landing by the preparation team will be subject to penalty of 100 points from the day's final result.
3.2, Local rules
3.2.1, Launch failure
Whether the failure is caused by the pilot or the launcher, the pilot will get a 0 mark.
3.2.2, Landing failure
Landing failure means the model landed outside of the assigned landing zone. Unless landing in the landing zone becomes impossible or it could cause a safety issue
due to circumstances that are out of the control of the competitor, duly witnessed by the official judges, landing failure will result in a 0 mark (DNF).
Model crashed during a landing will not be considered as a landing failure, as long as it crashed in the landing zone.
3.2.3, Re-flight procedure
No airborne reflight is allowed. All re-flight must be carried out after a proper landing according to the instruction of the Contest Director (CD).
If the landing failed, the re-flight will be cancelled and result in a 0 mark (DNF).
3.2.4, Flight interruption
If the flight cannot be carried out or due to safety issues, duly witnessed by the official judges, the CD can interrupt the flight before the competitor finished the
timed flight. If the cause of the interruption is non-avoidable, the competitor is eligible for a re-flight. Otherwise he will get a 0 mark (DNF).
Some examples, but not limited to:
a, The condition becomes too weak that the flight in progress is obviously not possible to continue.
b, The flying area is not clear or the model is damaged that could cause a safety issue.
c, Timing errors that must do a re-flight.
3.2.5, Announcement of a re-flight
If the competitor is eligible for a re-flight (see 5.8.5, Volume 3, Section 4 of FAI sporting code), he/she will be acknowledged by the CD the reflight option.
The competitor has to decide immediately if he would accept the re-flight or not.
If it is judge errors could cause an advantage to the result, the result will be discard and the competitor must carry out a re-flight.
(Usually in this case the CD can interrupt the flight before it is completed.)
Some examples, but not limited to:
a, Finish line late buzzer - Competitor can choose to do a re-flight or not.
b, Finish line early buzzer - Must do a re-flight.
Time records made in un-favourable conditions to the competitors (for example, example a above) are counted.
4. Contest Arrangements
4.1, Contest administration team
A team composed of a CD, a co-CD and one or two helpers is assigned to handle and run a scheduled race. There will be a roster on the league race timetable,
and the members of a team for each race day will be announced before the league started. This team is solely responsible for setting up the contest equipment,
running the contest and recording the timings. All team members must arrive at the flying site at least half an hour before the official start time of the contest
in order to prepare for the site, setting up the poles, running the cables, testing the timer, and etc. The designated CD and co-CD can also participate
in the contest. During the CD’s own F3F run, the co-CD is in charge and via versa. Only the CD (or co-CD during CD's own run) is allowed to judge and give penalty.
CD and co-CD do not need to serve as base beepers. The arrangement of base judges follows the workable scheduling policy we already have in previous years.
Helpers, onlookers and other pilots must keep quiet during a pilot's run in order to minimize disturbance to the contesting pilot.
CD has the power to expel or disqualify anyone who breaks this regulation after giving repeat warnings.
4.2, Contest duration
The official start time of the contest is normally at 8:00am, unless otherwise specified by the CD according to the flying site selected and weather condition.
Pilots who arrive late may be allowed to join the race at the end of a round if it is already started. The last round is usually the one running at 4:30pm,
however, it is dependent on the flying site, wind condition and number of contestants. CD should announce the end time prior to start the contest.
4.3, Contest fee
A contest fee of HK$40 for HKRCSS members and HK$60 for non-members for each race will be charged. Pilot who has not entered the league before will not be charged
for his first race. This fee is subject to change after annual review by HKRCSS, however, it will be based on a balanced budget principle according to the
average number of contestants in the league.
4.4.1, Shields for each race
There will be shields awarded for the champion, 1st runner-up, 2nd runner-up and the fastest time in each monthly race. The CD for that race is responsible
for purchasing/making the shields and brings them to the flying site. The budget for the shields should not be more than half of the total contest fee
collected for that race. Remaining will be saved and then contribute to the making of the year-end trophies and equipment maintenance.
4.4.2, Year-end awards for the league
There will be trophies of decent quality (or equivalent) or certificate awarded for 1st to 8th places of individual, and 1st to 3rd places of team,
and the fastest time in the league result table. Each pilot who has participated in the league races will receive a certification of appreciation.
To promote F3F sport, a “Top of New Blood Award” will be presented to a new F3F pilot who can fulfill the following requirements: i, has not joint more than
half of the successfully held races in the previous leagues, and ii, average score of 900 or above, and iii, highest score among the other new bloods.
1, "International F3F contests" refer to those that have limitation on the number of participants of each country. This includes Typhoon race, Viking Race and FAI F3F World Championship.
2, Due to the different natures of International F3F contests, say the span of the contest and the time required for travelling and preparation, for flexibility
we tend not to precisely state the method of choosing a new day. Anyhow, we will try to choose a day that is acceptable by the league contestants as a principle,
and we believe that there should be enough time (usually over half a year) for the contestants to adjust their schedule for the new day.
Revision 6.2 / December 10, 2017
1.1, Change race schedule to 18 dates in two sessions.
Revision 6.1 / December 24, 2016
3.2.5, Cancelled wind condition related reflight arrangement, that the reflight is now compulsory in 2017 code.
Revision 6.0 / December 20, 2016
3.1.2, Add details about the penalty of practice flight before competitions.
Revision 5.0 / February 2014
1.1, 12 matches out of 15 scheduled days (Same as 2012).
3.1.1, Add details of model requirements.
3.2.5, Cancel the requirement the a reflight must be preceded by a completed flight.
Cancel the limitation that the competitor cannot have the time result before the reflight decision.
Time records are still accepted if condition is not good.
Some wordings update.
Revision 4.0 / February 2014
1.1, Cancelled 12 out of 15 competitions.
1.2, Revised directives of race cancellation. Added guid lines for cancellation.
4.1, Allow 2 helpers.
4.4.2, Trophies / Certificates for places 1 to 8 at final.
Revision 3.0 / February 2013
3.2, Local rules updated.
4.3, "Re-flight" canceled because the updated local rules covered the details of the re-flight handling. 4.3 becomes "Contest fee" and so on.
Revision 2.0 / December 2012
1.1, Change of race schedule (12 out of 15 scheduled races)
1.2, Decision on race cancellation or change of flying site.
Revision 1.2 / August 2011
1.3, Amendment: Change "Fastest time" to "Slope best time".
Note 1, World Championship is not provisional.
Revision 1.1 / June 2011
1.1, Add note 2.
1.3, Personal best and site record will be kept as official even the race is incomplete.
F3F Rules 2017 Edition
FAI Sporting Code
Section 4 – Aeromodelling
Radio Control Soaring Model Aircraft
CLASS F3F - RADIO CONTROL SLOPE SOARING
Definition: This contest is a speed event for radio
controlled slope gliders.
Characteristics of Radio Controlled Slope Gliders
Paragraph B.3.1 a) of Section 4B (Builder of the Model aircraft) is not
applicable to class F3F.
Maximum surface area .................................... 150 dm2
Maximum flying mass . ...................................... 5 kg
less than 75 g/dm2
The use of any onboard-sensed data to automatically move the control
surfaces or to modify the aircraft geometry is prohibited.
Minimum radius of fuselage nose 7.5 mm in all orientations (see
The radio shall be able to operate simultaneously with other
equipment at the normally used spacing in the allocated R/C bands (i.e.
35 MHz : 10 kHz).
The competitor may use three models in the
contest. The competitor may combine the parts of the models between the
rounds provided the resulting model used for flight conforms to the
rules and that the parts have been checked before the start of the
contest. Addition of ballast (which must be located internally in the
model) and/or change of angles of setting are allowed. Variation of
geometry or area is allowed only if it is actuated at distance by radio
Any technological device used to aid in supplying data
of the air’s condition or direct feedback of the model’s flight status
is prohibited during the flight. These devices include any transmission
or receiving devices not used to directly control the model aircraft
(telephones, walkie-talkies, telemetry of airspeed and altitude etc),
temperature detecting devices (thermal imaging cameras, thermometers
etc), optical aids (such as binoculars, telescopes etc), and
distance/altitude measuring devices (GPS, laser range finders etc).
Telemetry of signal strength at the aircraft receiver and state of the
receiver battery is permitted. Use of corrective eyeglasses and
sunglasses are permitted. If an infringement of this rule occurs, the
pilot will be disqualified from the contest.
Competitor and Helpers:
The competitor must operate his radio equipment personally. Each
competitor is permitted one helper. The helper is only to assist and
advise the competitor until the model is passing Base A for the first
time and after the timed flight is completed.
Definition of an Attempt: There is an attempt when the
model has left the hands of the competitor or his helper.
of Attempts: The competitor has one attempt on each
flight. An attempt can be repeated if:
The re-flight shall happen
as soon as possible considering the local conditions and the radio
frequencies. If possible, the model aircraft can stay airborne and has
to be brought to launching height, launching speed and launching
position before the new 30 second period is started by the judge.
launching attempt is impeded, hindered or aborted by circumstances
beyond the control of the competitor, duly witnessed by the official
- his model collides with another model in flight
or other impediment and the competitor is not to blame on that account;
- the flight was not judged by the fault of the
model (i.e. the fuselage nose) fails to pass above a horizontal plane,
level with the starting area, within five seconds of exiting the
course, due to circumstances beyond the control of the competitor, duly
witnessed by the official judges.
Cancellation of a Flight: A flight is official when an
attempt is carried out, whatever result is obtained.
A flight is official but gets a zero score if:
Organisation of Starts:
The flights are to be performed round by round. The starting order is
settled by draw in accordance with the radio frequencies used.
- the competitor used a model not conforming to
- the model loses any part while airborne;
- the helper advises the competitor during the
- the model is controlled by anyone other than
- the flight is not carried through;
- the model lands outside the assigned landing
- the model is not launched within 30 seconds
from the moment the starting order is given.
part of the model aircraft fails to pass above a horizontal plane,
level with the starting area, within five seconds of exiting the course.
- the model aircraft is not seen entering the
course by the Judge at Base A.
The competitor is entitled to three (3) minutes of preparation time
from the moment he is called to the ready box.
the three (3) minutes have elapsed, the starter may give the order to
start. After the starter has given the order to start, the competitor
or his helper must launch the model within thirty (30) seconds by hand
from the starting area indicated by the organiser.
the starting area, including the audio system, shall be situated in the
middle of the course (equal distance from Base A and Base B).
The time from launch to the moment the model enters the speed course
must not exceed thirty (30) seconds.
the model has not entered the speed course (i.e. first crossing of Base
A in the direction of Base B) within the thirty (30) seconds, the
flight time will commence the moment the thirty (30) seconds expire. If
the model has not entered the speed course within the thirty (30)
seconds, this is to be announced by the judges.
The task is to fly ten (10) legs on a closed speed course of one
hundred (100) metres in the shortest possible time from the moment the
model first crosses Base A in the direction of Base B. If some
irremovable obstacles do not allow one hundred (100) metres the course
may be shorter but not less than eighty (80) metres. This exception
does not apply for world or continental championships.
The competitor’s model aircraft must be visible to the appropriate
judge on the turns at Bases A and B.
The speed course is laid out along the edge of the slope and is marked
at both ends with two (2) clearly visible flags. The organiser must
ensure that the two (2) turning planes are mutually parallel and
perpendicular to the slope.
Depending on the circumstances, the two (2) planes are marked
respectively Base A and Base B.
A is the official starting plane. At Base A and Base B, an Official
announces the passing of the model (i.e. any part of the model
aircraft) with a sound signal when the model is flying out of the speed
course. Furthermore, in the case of Base A, a signal announces the
first time the model is crossing Base A in the direction of Base B.
The sighting device used for judging the turns must be placed in a safe
organiser must clearly mark a safety line representing a vertical plane
which separates the speed course from the area where judges, other
officials, competitors and spectators stay. Crossing the safety line by
any part of the model aircraft during the measured flight will be
penalised by 100 points subtracted from the sum after conversion, the
penalty not being discarded with the result of the round. The organiser
must appoint one judge to observe, using an optical sighting device,
any crossing of the safety line.
Judging: The flights are judged by two judges who do not
have to be the same for all competitors.
judges' task is to control that the flights are performed according to
the rules, to be time keepers and to ensure that the right distance is
The result of the flight is stated as the time in seconds and
hundredths of seconds obtained by each competitor. For the purpose of
calculating the result of the round or group (se e paragraph 5.8.16),
the competitor's result is converted this way:
1000 x Pw / P
where Pw is the best result in the round or group (se e paragraph
5.8.16) and P is the competitor’s result.
A minimum of four (4) rounds must be flown for the competition to be
valid. In this case the lowest round score of each competitor will be
discarded. If more than fourteen rounds were flown, the two lowest
round scores will be discarded. The remaining results are added to
obtain the final score which will determine the position of the pilot
in the final classification.
To avoid ties in the classification
concerning the five best scores, "classification rounds" are flown
until the ties are broken. If this is not possible, the result of the
discarded round will determine each competitor's position in the final
Organisation of the Contest: The competition must be held
at a site which is suitable for slope soaring.
marking the starting and landing areas and the turning planes, the
organiser must take into account the configuration of the terrain and
the wind direction.
Changes: Any changes of the flight and landing areas may
be made only between rounds or between groups.
Weather Conditions and interruptions: A round in progress
must be interrupted if:-
these conditions arise during the flight the contest director must
interrupt the contest and the competitor is entitled to a re-flight.
wind speed is below three (3) m/sec or more than twenty five (25) m/sec
for at least twenty (20) seconds two (2) metres above the ground at the
- the direction of the wind constantly deviates
more than 45O from a line perpendicular to the main direction of the
- In the case of rain.
whole group must be divided into groups of equal size (+-one (1)
competitor) with a minimum number of competitors in one group of ten
(10) before the round starts.
If the weather is stable during
the whole round only one group is evaluated; if the competition must be
interrupted more than thirty (30) minutes, then the interrupted group
must start from the beginning and the results are evaluated for each
group (see paragraph 5.8.12).
The diagram of recommended F3F Flying Field Layout follows
Unofficial F3F competitions
Revision 2 / June 2017
Besides the official HKRCSS F3F league race, pilots can also organized F3F competitions by themselves. These "unofficial F3F competitions",
if properly conducted and fulfill the following requirements, the result, personal best and site record made will be recognized by HKRCSS.
1, The organizer shall announce the F3F competition through widely known Hong Kong F3F media (for example, http://www.rcsail.com)
1 day prior to the event, and submit the results after the competition.
2, The F3F competition must be approved by F3F group leaders prior to the announcement of the event.
3, The F3F competition has at least 10 competitors
4, The F3F competition is conducted according to FAI F3F (*) and HKRCSS F3F local rules.
(*) Except the lower limit of wind condition and rain. These will be determined by the CD according to the specific condition of the flying site.
See rcsail.com for reasons of updates to rev.2.