The current 2020 Rules

These can also be found in the bmfa handbook

5.3.1 GENERAL

5.3.1.1 Contest Records
Within model pylon racing it is possible to exaggerate the true speed of an aircraft by incorrectly positioning the course. For this reason all R/C Power Pylon Racing records submitted must contain a signed statement from the Contest Director to verify that the course was re-measured after the record flight and that all the dimensions are as laid down in the current BMFA or FAI rule books

5.3.2 BMFA Variations F3D & F3T Pylon Racing

F3D & F3T classes do not have any BMFA variations. Full rules may be found at https://www.fai.org/page/ciam-code

5.3.3 F3D & F3T Leagues Scoring (5.3.3 F5D TS is now 5.3.5)

(a) The F3D and F3T BMFA Leagues shall employ a scoring system designed to
enhance rewards for higher performance (lower race times).
(b) The overall BMFA League result is achieved using a Weighted Points System applied to the individual League competition results.
(c) The BMPRA will present a BMPRA League cup to the winners of the F3D and the F3T Leagues at the end of the season.

5.3.3.1 League Scoring System

League points are calculated and awarded for each BMFA F3D and F3T competition
held throughout the season with double points awarded for the BMFA Nationals.

5.3.3.1.1 League Scoring Conditions

(a) A valid League racing competition must have a minimum of two pilots achieving a valid aggregate time.
(b) A valid aggregate time is the average time of at least three valid heats. If there are four heats, then each pilot’s worst time is discarded; if there are eight heats a pilot’s two worst times are discarded and if there are twelve or more heats a pilot’s three worst times are discarded.
(c) A valid heat time is one which is not a 200 which is considered a Penalty time, obtained by having one of the following:
( i) Did Not Start
( ii) Did Not Finish
(iii) Disqualification by the Starter or CD
(iv) Two cuts.
(d) The League competition winner is the pilot having the lowest valid aggregate Time. The remaining pilots are ranked in order of increasing times. Pilots who achieve only penalty times during league competitions, are not ranked.
(e) In the summing of the scores:
( i) at a competition ties shall be broken by a fly-off race if time permits. Otherwise the best single race time shall resolve the tie. If the tie is still not broken then the second best single race time shall be taken and so on until the tie is broken.
(ii) of the overall League results the best single race time shall resolve the tie. If the tie is still not broken then the second best single race time shall be taken and so on until the tie is broken.

5.3.3.1.2 Scoring System

(a) For 2020, the target time is set at 60 seconds and the maximum points available for each League competition winner is 10.
(b) Only whole points may be awarded. The available whole points from 10 down to 1 are assigned to the following time bands: (See Appendix at 5.3.3.1.3)

(c) Band 1 is for 60.00 or fewer seconds and = maximum 10 points.
(d) Band 2 is between 60.01 and 61.00 seconds and = maximum 9 points.
(e) Band 3 is between 61.01 and 62.00 seconds and = maximum 8 points.
(f) Band 4 is for 62.01 to 63.50 seconds and = maximum 7 points.
(g) Subsequent band limits are set at 65, 67, 69, 72, 76 and 85 seconds.
(h) Band 11 is for 85.01 seconds or greater from which moment no points are awarded.
(i) The pilot achieving fastest time of the day is awarded one additional point. 5.3.3.1.3) Appendix
The maximum points to be awarded (vertical Axis) plotted as a function of the time achieved above the target value of 60 seconds (horizontal axis).
Examples:-
(a) For a race with 5 contestants and:
• The winner gets an average time of 59.4. He is awarded the maximum of
10 points as he is in the top band.
• The 2nd place time is 62.7. He is awarded the max points for that band 7
points.
• The 3rd place time is 62.9. He is also in the band which has a max points
of 7 awardable and so he is awarded the next available score which is 6
points.
• The 4th place gets a time of 64.8 which has a band max of 6, but this has already been awarded, so he gets next available highest score of 5 etc.
• The 5th place time is 93.0. He is in the band of Max = 0 so gets zero
points.
(b) For a race with 2 pilots :-
• The winner gets a time of 66.1, so gets 5 points.
• The 2nd placed gets time of 72.2, so gets 2 points.

5.3.4 BMFA Variations on F5D Pylon Racing

The F5D class rules can be downloaded at https://www.fai.org/page/ciam-code or obtained direct from BMFA Head Office.
5.3.4.1 Starting Procedure

F5D will adopt the same starting procedures as the host classes. The timing of the models will start at the drop of the starter’s flag or the signal given by the electronic race program (not when the model reaches the start line after a run up period). Launching out the back of the course is specifically prohibited in the interests of safety.

5.3.4.2 Nomination of Contest Director
A member of the F5D fraternity will be nominated as the class CD at the start of every meeting, including the BMFA Nationals. He/she will be the sole point of contact between the competition organisers and the F5D competitors and will also determine what level of scrutineering will take place, if any.

5.3.4.3 Weighing of Models
Any scales made available for competitors to check the weight of their models will be considered as being the “scales of the day”. The scales supplied will not always be the same set and for that reason they will not necessarily be calibrated. The scales will be made available throughout the period of the competition and it is the competitor’s responsibility to ensure that his model complies with the manufacturer’s maximum all up weight. In the event of any dispute regarding the weight, wing loading or dimensions of any model, the manufacturer’s figures will be considered as fact.

5.3.5 F5D Team Selection

5.3.5.1
(a) Selection for a World or European Championship team will be made in the year preceding the Championship.
(b) Team Selection will be based on an individual’s cumulative scores from BMPRA sanctioned league competitions held during the qualification year.
(c) The score for each competition is calculated as per F5D league scoring. The best scores from the eligible competitions to count are added together to get a total team selection score. These scores are ranked and the top three competitors are offered a place on the team.
(d) If any of those qualifying do not wish to be a team member, the place or places will be offered to other competitors in order of the team selection score ranking, i.e 4th place in is 1st reserve for the team.
(e) The number of competitions to count for team selection is as follows:
4 competitions from 7 or more eligible competitions to count
4 competitions from 6 eligible competitions to count
3 competitions from 5 eligible competitions to count
3 competitions from 4 eligible competitions to count
3 or fewer competitions flown, all rounds to count
(f) Selected team members may nominate one “Caller” to be included as part of the Championships team. The “Caller” is an official member of the team and therefore must also hold a valid FAI Sporting License for the year of the Championship and should commit to attending the relevant Championships as a team member.
(g) The selected team is submitted to the BMFA by the appropriate Specialist Body, currently the BMPRA.

5.3.6 F5D League Scoring

5.3.6.1

(a) For each competition the winning competitor will be the one with the lowest cumulative time for the counting heats from the day’s competition.
(b) The winner of the league will be the individual with the lowest total time, with a maximum of five rounds counting towards the total. The team will consist of the three pilots gaining the lowest total time for the required number of qualifying rounds as stated at clause (E) stated above.

5.3.5.1
No team member will be selected if they have not competed in any rounds..

5.3.7 E2K Electric Pylon Racing

5.3.7.1 Fuselage
(a) The motor bulkhead shall be a minimum of 2 1/4" X 2 1/4" (57.15mm x 57.15mm) The motor can be mounted directly on to the bulkhead or onto the bulkhead via 4 parallel standoff pillars to assist with achieving the correct C of G. These pillars can be up to a maximum of 80mm long and 15mm diameter.
(b) Cross section measured at the wing trailing edge shall be a minimum of 2 1/4" X 2 1/4" (57.15mm x 57.15mm).
(c) The fuselage at the deepest point shall measure a minimum of 2 1/4" wide X 3 1/4" (57.15mm x 82.55mm) deep, including the wing section and shall occur somewhere between the wing leading and trailing edges.
(d) Wing fairings, fillets or motor cowlings are not allowed.
(e) Maximum radius of the fuselage corners will be 1/4" (6.35mm).

5.3.7.2 Wing
(a) The wing shall have a minimum span of 35" (889mm) and shall be a constant chord.
(b) The minimum wing thickness shall be 7/8" (22.22mm) for the 35" (889mm) span.
(c) The minimum wing area shall be 300 sq. inches (19.36dm2).

5.3.7.3 Powertrain
(a) Batteries – Any lipo battery may be used with a maximum of 4 cells.
(b) The only motors permitted will be:-
Turnigy SK3-3536-1400kV Aerodrive XP Outrunner,
Overlander Thumper 3536/05 all versions,
NTM Prop drive series 35-36A 1400kV.
(c) Motors may not be tuned or modified and can only be repaired using standardreplacement parts except as stated at paragraphs (g) and (h).
(d) The motor must be capable of being throttled on demand.
(e) The motor must be fitted with a rounded spinner nut or a 1 1/2" (38.1mm) minimum diameter plastic spinner.
(f) The only permitted speed controllers are those that have been flashed to limit therpm to no more than 15,232 rpm. Flashed speed controllers are currently available from the BMPRA.
(g) In the interests of safety the excess of the motor shaft can be ground off the rear of the motor.
(h) As an economic repair scheme, the prop driver casting can be secured to the magnet housing by the use of a maximum of four small bolts.

5.3.7.4 Propeller
(a) The only allowable propeller is the APC 8x8 propeller product code LP08080.
Changes to the propeller blades are not permitted. For the purpose of balancing, changes shall be done to the thickness of one blade only. (Removal of material/mass). Edges and tips may be sanded, but only as much as necessary to remove sharp moulding flash (deburr).

5.3.7.6 Radio
The model will have a minimum of three channel radio controlling ailerons, elevator and throttle.

5.3.7.7 Materials
With the exception of the elevator pushrod, the use of carbon fibre is not allowed anywhere within the model.

5.3.7.8 Weight
The minimum weight of the model shall be no less than 2.25lbs (1022 g) and a maximum weight of not more than 3.75lbs (1705 g) ready to fly.
5.3.7.9 Course Dimensions & Race Officials
(a) Course size is 40 m between base pylons and 115.75 m from the base pylons to the No.1 pylon. The start line is to be 18 m from the base pylons. The four launching positions will be marked at 4.5 m intervals along the start line centre to the course.
(b) Course layout is therefore a long triangle and should be set with the wind blowing from the No1 pylon towards the base pylons. The method of flying the course will be anti clockwise. It is the responsibility of the contest director to ensure the accurate positioning of all pylons relative to the flight path of the models.
(c) The pylons should be a minimum of 15ft (4.572 m) high and surmounted by a square flag. The top of the No1 pylon should be above the horizon if possible. A sighting pole is to be positioned adjacent to the No.1 pylon at 90 degree to the centre line of the course.
(d) Up to four timekeepers will be used and will be responsible for the recording of the race times. Up to four Flag Marshals will be used to indicate when a model has reached No1 pylon. These Marshals are also responsible for reporting any No1 pylon infringements.
(e) A minimum of one pylon judge per pylon will be employed to report any pylon infringements at Nos 2 and 3 pylons.

5.3.7.10 Mid-Air Collisions
In the event of a mid-air collision all models in that heat are to land immediately. All participants involved will have a re-fly that will take place at the end of the round in which the collision took place. A maximum of 10 minutes will be allowed for preparation time to allow competitors to prepare a spare model for the re-fly.

5.3.7.11 Starting Procedure
The race will consist of a maximum of four competitors and will be of 10 laps distance. Following the identification process a two-minute readiness time will be allowed on the start line to prepare the model for flight. The starter will signal the start of the race with the drop of a flag whereby all models in that heat will be launched simultaneously. No model is to be launched after the leading model has completed the first lap. Should any model crash or not get away it is not to be retrieved until the end of the race. Pilots and callers must stand behind the start line at all times during the race.

5.3.7.12 Timekeeping
(a) A timekeeper, equipped with a stopwatch will be allocated to each competitor during the model identification process.
(b) The model is to be launched from behind the start line. Any model deemed to have been launched prematurely or forward of the start line will be subject to a 10% time penalty (which will count as 1 cut) being added to the total time.
(c) Any pilot causing his model to cut inside a pylon will have a 10% time penalty added to his time. Two cuts in the same heat will result in that pilot being disqualified from that heat. Should any dispute arise regarding lap timing / counting or flagging errors the Competition Director’s (CD) decision will be final.

5.3.7.13 Dangerous Flying
Low flying is consistent flying below pylon height. The CD may issue a warning for low flying, if the competitor continues to fly low, in subsequent heats, the CD reserves the right to disqualify the perpetrator from that heat or the meeting.

5.3.7.14 Model Processing
(a) The CD reserves the right to check, or have checked, all models for all aspects of compliance with these regulations. Any model found to be outside the rules will be disqualified. Any competitor who has raced a model that has subsequently been
checked and found to be outside the rules will be excluded from that heat.
(b) The offence of exclusion will carry the application of a maximum time penalty. Any heat from which a competitor has been excluded cannot count as a dropped score and will count towards the final score.

5.3.7.15 Protective Clothing
All competitors, helpers, timekeepers, flag marshals and race officials are to wear hard hats at all times whilst racing is in progress.

5.3.7.16 Number of Heats Flown
To account for weather conditions and other possible interruptions to the race day programme the number of heats that will count towards final scores will be as following:

5.3.7.17
Scoring
The pilot with the lowest total time from the number of heats flown will be deemed to be the winner of the competition. If numbers and time permits two semi finals and a final will be flown to decide the top eight positions. League points will be awarded in descending order from 8 down to 1 for the top eight competitors.
Number of Heats Flown Number of Heats Counting
3 2
4 2
5 3
6 4
7 4
8 5
9 6
10 6
11 7
12 8

5.3.8 Club 32 Pylon Racing

5.8.3.1 Intention
(a) The Club 32 class (C32) of Pylon Racing is intended as a sport class of entry level internal combustion powered Pylon Racing for both beginner and expert competitor alike at club level
(b) These rules define a Pylon Racing model comprising parts readily available from the UK modelling trade with no need for competitors to manufacture component items and which may be flown at most flying sites within the UK
(c) The following rules apply to the model specification, engines and functionality of the aircraft suitable for the C32 class.

5.8.3.2 Definition of Radio Control Pylon Racing Model Aircraft Club 32

(a) Model aircraft in which the propulsion energy is provided by a piston type engine and in which the lift is obtained by aerodynamic forces acting on the supporting surfaces, which, except for the control areas, must remain fixed in flight.
(b) No delta, oblique, variable geometry, variable section or flying wing type aircraft are
permitted.

5.8.3.3 Technical Specifications of C32 Pylon Racing Model Aircraft.
(a) The model aircraft must be of conventional design with forward wing and an aft tailplane with the engine mounted in tractor configuration in the nose of the airframe.
(b) Each competitor may process and use a maximum of three models during a
competition.
(c) The use of composite materials such as fibre glass and epoxy for wing skinning or aramid cloth and epoxy for fuselage reinforcement and hinging is permitted in the construction of the models.
(d) The use of carbon fibre cloth, tow or other products made from it, is prohibited except for the formation of pushrods, moveable surface control horns or wing holddown dowels.
(e) Wings may be vacuum bagged over foam or glass clothed under Mylar films for a smooth surface finish but must not be manufactured using hollow moulding techniques or pre-formed wing skins brought together over a spar to form a lifting wing section. Built up wings are permitted. (See also 5.8.3.2 (b))

5.8.3.4 Weight
Weight, less fuel but including all equipment necessary for flight, shall be at least 1160 g (2 pounds 9 ounces). If ballast is used it must be permanently and safely affixed to the model.

5.8.3.5 Fuselage

5.8.3.5.1 Depth
The fuselage shall have a minimum height of 127 mm [5 inches] and a minimum width of 69.85 mm [2.75 inches]. The measurements to be of the fuselage body and are to exclude any fins, attachments or spacers. Both minimum dimensions must occur at some point within the wing chord. Fillets are not considered part of the fuselage or lifting
surfaces.

5.8.3.5.2 Cowls
Cowling of the engine or silencer is prohibited. A natural fair line of the fuselage around the lower part of the crankcase and a ring around the prop driver behind the spinner is permitted.

5.8.3.6 Lifting Surfaces

5.8.3.6.1 Area of Surfaces
The total projected area of the wing lifting surface shall be a minimum of 19.35 dm²[300 sq. inches]. The tailplane is not included in the wing lifting surface calculation.

5.8.3.6.2 Wing Span
Minimum wing span shall be 890 mm [35 inches]. Maximum wing span shall be
1000 mm. [39.4 inches].

5.8.3.6.3 Wing Thickness
Wing thickness shall be at least 22.23 mm [7/8 inch] at the wing root and 15.88 mm [5/8 inch] at the wing tip which is measured at a maximum of 50.8 mm [2 inches] in from the wing tip outermost point. Wing thickness may only decrease in a straight line taperfrom root to tip as viewed from the leading or trailing edge.
Note: Root shall be defined as the innermost wing section, not counting fillets that may be measured without removing the wing from the fuselage.

5.8.3.6.4 Functionality
(a) The model must be controlled by the competitor using radio control to operate conventional ailerons, elevator, rudder and throttle controls only or any combination thereof.
(b) Coupling of control surfaces or electronic mixing is prohibited other than to drive dual ailerons (operating only as ailerons) from the same transmitter stick. Flaps or flapperons of any kind are prohibited as is coupling of control surfaces on the wing to the elevator function (e.g. SnapFlap) of the model or any variable mixing governed by the speed of the model in flight (e.g. GPS monitoring).
(c) Additionally: The use of radio receivers and servos of types with integrated gyro stabilisation capability is prohibited.
(d) The following are permitted:
( i) Control rate devices that are manually switched by the competitor.
(ii) Any type of button or lever, switch, or dial control that is initiated or activated and terminated by the competitor.
(e) The following are prohibited:
( i) Any system that can move the control surfaces without direct competitor input in response to other inputs.
( ii) Pre-programmed devices capable of automatically performing a series of commands.
( iii) Auto-pilots or gyros for automatic stabilisation of the model aircraft.
( iv) Automatic flight path guidance.
( v) Any type of learning function involving manoeuvre to manoeuvre or flightto flight analysis.

5.8.3.7 Engine(s)
(a) The only permitted engines are:
West 32 Pylon special
ASP 32
Super Custom (SC) 32
(b) Engine modifications of any type whatsoever are prohibited. The engine must be fitted with the head shim supplied by the manufacturer and any replacement parts must be the those supplied directly or indirectly by the manufacturers or UK agents (Just Engines for ASP and J Perkins for SC 32 & Weston UK).
(c) In the case of the ASP and SC 32, the needle valve may be positioned on either the carburettor or at the rear mounted position utilising the brackets provided for this by the manufacturer. The engine must be used with the silencer provided by themanufacturer/distributor. Swapping of silencers between the ASP/SC brands and the Weston are prohibited.
(d) The engine must be capable of being throttled on demand.

5.8.3.8 Exhaust
The exhaust outlet must be of a round form (tolerance 0.1mm ovality) and must have an outlet diameter no greater than 7.1 mm.

5.8.3.9 Propellers and spinners
(a) The only permitted propeller is the APC 8”x8” (Product Code: LP08080 ) injection moulded ‘Sport’ range, two bladed propeller designed for use on internalcombustion engines. Fitted propellers must maintain the diameter, pitch, blade width, and blade aerofoil of the approved part at every measurable station.
(b) The following modifications may be made without penalty:
( i) One blade may be sanded on the top (front) side only for balancing.
(ii) Edges and tips may be sanded, but only as much as necessary to
remove sharp moulding flash.
(iii) The propeller hub hole may be slightly reamed to allow a good fit on the engines drive shaft.
(c) The model shall be fitted with a rounded nose spinner at the front of the engine with a diameter of at least 38 mm [1.5 inches]. There is no restriction on the material or dynamic balancing of the spinner, but domed propeller retaining nuts are prohibited unless they meet the minimum spinner diameter requirement.
(d) Counter-balanced spinner backplates are prohibited.

5.8.3.10 Fuel System
(a) The fuel system may only be pressurised from the engine’s exhaust system. Other pumping of the fuel from tank to engine is prohibited. A fixed or weighted pick up is permitted. Any type of bladder, sack, pacifier or bag to contain the fuel within the tank is prohibited.
(b) In-flight adjustment of the fuel/air mix to the engine carburettor is prohibited.

5.8.3.11 Fuel
The official race fuel is West Prosynth 10% produced by Weston UK and must be used as supplied by the manufacturer with no without additives. Fuel will be provided for official BMFA competitions.

5.8.3.12 Race Course and Procedure
(a) The course size is 40 metres between base pylons and 115.75 metres measured down the course centre line from the base pylons to number 1 pylon. The start line must be 18 metres from the base pylons. Three launching positions must be marked at 4.5 metre intervals along the start line, to the right of the course centre line if possible.
(b) The pylons should be a minimum of 4.5 metres high, surmounted by a
500 mm x 500 mm (min) square flag. The top of the No. 1 pylon should be above the horizon if possible.
(c) The course layout is a long triangle and should be set if possible with the wind blowing from No. 1 pylon towards the base pylons. The course will be flown in an anti-clockwise direction. It is the responsibility of the Contest Director (CD) to ensure the accurate positioning of the course and pylon marshals. Principally this should be in line with FAI guidelines which can be found at https://www.fai.org/page/ciam-code

5.8.3.13 Pylon Judging:
(a) All competitors are required to fly around each pylon, therefore, pylon judges and flag men are to ensure a complete circuit is made.
(b) If a model hits any part of a pylon, excluding the flag, then a cut will be awarded and the race will be stopped for inspection of the model and pylon. The cut will stand for any subsequent re-fly.
(c) No. 1 pylon flag men are to ensure that the model has passed the pylon, before dropping their flags. Once a No. 1 flag man has dropped his flag, he may not award a cut under any circumstances.
(d) Time keepers will be situated in a straight line facing No 3 pylon, the race time will be taken from the drop of the Starter's flag, until the tenth lap, when the model is inline and passing No. 3 pylon. A competitor cutting a pylon (flying inside), will have ten percent of the 10 laps time added to his overall time.
(e) A launcher and model, must be behind the start line when the flag drops for the
start of the race, otherwise one cut will be awarded against the competitor. If a launcher is judged to have launched the model before the Starter drops the flag, then one cut will be awarded against the competitor. Two cuts in any race, will cause the competitor to be disqualified from that race.
(f) When an officially acknowledged timing, flagging or any administrative error takes place, only the competitor directly involved will be given a re-fly. Where a dispute exists on lap counting, flagging or timing errors, the Competition Director’s decision is final. If the Competition Director is flying in a particular round, he must delegate his responsibilities whilst flying that round.

5.8.3.14 Start Positions:
(a) Normally, a competition matrix will ensure that competitors will rotate along the start line positions throughout the competition rounds. The qualifiers in each semi-final or final will choose their own positions on the start line, accordingly to their qualifying times, ie: the fastest qualifier has first choice, second qualifier second choice and third qualifier takes the remaining position.
(b) The competitors will identify their models to the pylon judges, switch on their radios and check correct operation of their models when told to do so by the Starter.

5.8.3.15 Starting Procedure:
(a) The race will consist of a maximum of three competitors flying 10 laps of the course. Models will be hand launched from behind the start line. 30 seconds will be allowed for starting engines.
(b) The models will be launched at one second intervals except finals where there will be a simultaneous start. Timing will commence upon the drop of the model’s flag regardless of whether the model is launched at that precise moment.
(c) For safety reasons, models must not be launched after the first model has crossed the downwind leg of the start/finish line.
(d) Competitors may only retrieve their models after the race has finished and all models have landed.
(e) Competitors and their callers must stand behind the start line at all times.
(f) Models may only be flown between the base pylons on landing by permission of the Starter.

5.8.3.16 Mid-air Collisions:
(a) In the event of a mid-air collision all models in that race must land immediately for inspection. All competitors in that race will have a re-fly which will take place at the end of the round in which the mid-air occurred. Any cuts awarded prior to the midair will stand for the subsequent re-fly.

BMFA R/C Power Rules 33 Effective January 2020
(b) If a competitor suspects a mid-air collision, he should notify the Starter and pull out if instructed to do so. The model will be inspected immediately on landing and if found to be damaged as a result of the mid-air then a re-fly will be awarded.

(c) If the mid-air collision occurs after one competitor has completed 10 laps, then his finishing time/position shall stand. If this situation arises in a semi-final, or final,those competitors involved in the mid-air shall be deemed to have finished behind the one who completed the race and there shall be a “fly off” for the remaining places.

(d) At the CD’s discretion, a competitor may be allowed a trimming/check flight to ensure the safe flying characteristics of a model that has been subject to a mid-air or which has not been used during the competition. Such check-flying shall not take place until the course has been erected and the CD has granted permission.

5.8.3.17 Dangerous Flying:
Low flying is consistent flying below pylon flag height, which endangers all concerned. The CD may give a competitor a warning for low flying and if the competitor continues to fly low, the CD shall disqualify him from that heat. The initial warning counts for all the following heats, semi- finals and finals. At the CD’s discretion, a competitor may be disqualified from the heat or the competition, if it is adjudged that he is flying dangerously.

5.8.3.18 Engine Checking:
The CD may randomly select (by lottery) one of the semi-finalists who must remove the cylinder head and liner for inspection by two selected examiners. The CD may also request that any engine that has raced on the day, be selected by the examiners for full scrutiny.

5.8.3.19 Model Checking:
The CD may request that any model that is to be flown in the semi-finals and finals, be checked for conformance to the technical regulations prior to those races.

5.8.3.20 Qualifying Times:
(a) Number of heats flown Number of heats counting
3 2
4 2
5 3
6 4
7 4
8 5
9 6
10 6
11 7
12 8
(b) No times, Did Not Start (DNF) and Did Not Finish (DNF) will be awarded a time of 200 seconds.

5.8.3.21 Finals Start Sequence:
For the finals only, all models will be launched at the drop of one start flag or indicator.

BMFA R/C Power Rules 34 Effective January 2020

5.8.3.22 Miscellaneous:
(a) Protective headgear must be worn at all times by all personnel in the flying area.
(b) No competitor may fly any model that has previously been flown by another competitor at the same competition.
(c) Ties in finals will be decided by taking the better semi-final time. If a tie still exists then the fastest single heat time will determine the winner.
(d) Any leagues will be determined by awarding 10 points for the competition winner, 9 for second and so on. According to the number of competitions flown, then competitors’ league scores will be determined on the same drop out basis as the semi-final qualifying times. Ties in the league will be broken by taking the fastest
time of the league. If the tie still exists then the second fastest time will be taken and so on until the tie is broken.

5.8.3.23 Interpretation of the rules:
Any interpretation of these rules will be at the discretion of the BMPRA Committee, whose decision will be final notwithstanding a competitor’s right to protest (see 5.0.6).