F3F Rules

**** Please read carefully the local rules hereunder ****

5.8 CLASS F3F - RADIO CONTROL SLOPE SOARING (updated 1st of January 2013)

5. 8.1. Definition: 

This contest is a speed event for radio controlled slope gliders. A minimum of four rounds must be flown. The organiser shall run as many rounds as the conditions and time permits.

5.8.2. 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
Loading .............................................................. 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 template below).

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 control.
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.

5.8.3. 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.

5.8.4. Definition of an Attempt: 

There is an attempt when the model has left the hands of the competitor or his helper.

5.8.5. Number of Attempts: 

The competitor has one attempt on each flight. An attempt can be repeated if:

a) the launching attempt is impeded, hindered or aborted by circumstances beyond the control of the competitor, duly witnessed by the official judges;
b) his model collides with another model in flight or other impediment and the competitor is not to blame on that account;
c) the flight was not judged by the fault of the judges.
d) the model (ie 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.

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.

5.8.6. 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:

a) the competitor used a model not conforming to FAI rules;
b) the model loses any part while airborne;
c) the helper advises the competitor during the timed flight;
d) the model is controlled by anyone other than the competitor;
e) the flight is not carried through;
f) the model lands outside the assigned landing area;
g) the model is not launched within 30 seconds from the moment the starting order is given.
h) any part of the model aircraft fails to pass above a horizontal plane, level with the starting area, within five seconds of exiting the course.
i) the model aircraft is not seen entering the course by the Judge at Base A.

5.8.7. 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 is entitled to three minutes of preparation time from the moment he is called to the ready box. After the three minutes has elapsed, the starter may give the order to start. After the starter has given the order to start, the competitor or his helper is to launch the model within 30 seconds. The competitor or his helper is to launch the model by hand from the starting area indicated by the organiser.

If possible, 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 seconds. If the model has not entered the speed course (i.e. first crossing of Base A in the direction of Base B) within the thirty seconds, the flight time will commence the moment the thirty seconds expires. If the model has not entered the speed course within the thirty seconds, this is to be announced by the judges.

5.8.8. The Flying Task: 

The flying task is to fly 10 legs on a closed speed course of 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 100 metres the course may be shorter but not less then 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.

5.8.9. The Speed Course: 

The speed course is laid out along the edge of the slope and is marked at both ends with two clearly visible flags. The organiser must ensure that the two turning planes are mutually parallel and perpendicular to the slope. Depending on the circumstances, the two planes are marked respectively Base A and Base B. Base A is the official starting plane. At Base A and Base B, an Official announces the passing of the model (ie 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.

5.8.10. Safety: 

The sighting device used for judging the turns must be placed in a safe position.

The 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.

5.8.11. Judging: 

The flights are judged by two judges who do not have to be the same for all competitors. The 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 flown.

5.8.12. Scoring: 

Scoring: 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

5.8.13. Classification: 

The sum of the competitor's round scores will determine his position in the final classification. If more than three rounds were flown the lowest round score of each competitor will be discarded and the others added to obtain the final score which will determine his position in the final classification. If more than fourteen rounds were flown, the two lowest round scores will be discarded. 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 classification.

5.8.14. Organisation of the Contest: 

The competition must be held at a site which is suitable for slope soaring. When 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.

5.8.15. Changes: 

Any changes in the flight and landing areas may be made only between flight rounds.

5.8.16. Interruptions: 

A round in progress must temporarily be interrupted if:-
a) the wind speed is below 3 m/sec or more than 25 m/sec for at least 20 seconds.
b) the direction of the wind constantly deviates more than 45O from a line perpendicular to the
main direction of the speed course.
If the interruption lasts more than thirty minute s, the n the starting list of the round is to be
divide d into groups and the score s (se e paragraph 5.8.12) are compute d within the groups.
The results of an incomplete group are to be cancelled and this group has to fly from the
The groups must be of equal size (+ - 1 competitor); the minimum competitors in one group
is 10; the division of the starting list must be announce d before the start of the round.
The round ma y continue if the conditions a re a gain constantly within the limits.