Rules

The following are extracts from the latest (2001) BMFA rulebook for UK Electric Flight Competitions.

7.11    

 7.11 ELECTROSLOT (E-SLOT)

 7.11.1 Objective

 To provide a silent flight class similar to ‘Thermal Duration Soaring’ but with electric

 power replacing hand tow. Five flights are made and ALL FIVE FLIGHTS are to be

 made with ONE INITIAL BATTERY CHARGE ONLY.

 7.11.2 Model Characteristics

 (a)        Maximum Surface Area…………………………………………………….150 dm2 (2325 in2)

             Maximum Flying Weight……………………………………………5 Kilograms (11.023 lbs)

 Maximum Surface Loading……………………………………….75 g /dm2 (24.51 oz / ft2)

             Minimum Surface Loading………………………………………….12 g /dm2 (3.95 oz / ft2)

 (b)       Power source must not exceed 7 cells.

 (c)       Any type of motor may be used.

 (d)       The motor run per round shall not exceed 60 seconds (1 min.).

 7.11.3 Battery Charging

 The Contest Director (CD) must ensure that cells are charged only before the first

 round. Between rounds the aircraft or at least the power packs may be impounded.

7.11.4 Organisation of Flying Slot

(a)        The flying order for the rounds shall be arranged in accordance with the radio

             frequencies in use to permit as many simultaneous flights as possible.

(b)        The flying order must be scheduled in multiples of five rounds sub-divided into

time slots.

(c)        The flying order on a round by round basis shall be determined by a matrix system

so that, as far as possible, each competitor flies against each of the other

competitors at some stage of the competition.

(d)        Entry on the day of the contest will only be accepted if a vacant position is

available.

(e)        A competition number must be allocated to each competitor and must be retained

throughout the rounds.

(f)         Competitors are entitled to a minimum of 5 minutes preparation time which is

counted from the moment he/she is called to take position at the designated

launching area.

(g)        The organisers must indicate very positively the start of slot time both audibly and,

if possible, visually.

(h)        The timekeeper(s) shall use two watches both of which shall be started on release

of the model. One watch will be stopped and re-started as required to record the

total ‘motor ON time’. The other watch will be stopped at the termination of the flight.

(i)         The motor run can be used at any time during the slot but the pilot must state

when the motor is switched on and when it is switched off.

(j)         The slot time shall be of exactly 12 (twelve) minutes duration, followed by a 1 (one)

minute penalty time.

(k)        Audible and, if possible, visual signals must be given when 10 (ten) minutes of the

slot time have elapsed.

(1)        The end of the slot time must be very positively indicated both audibly and, if

possible. visually. as for the start.

(m)       The end of the one minute penalty time must also be positively indicated. Any

model still airborne at this time will score zero for the flight.

7.11.5 Landing

(a)        The landing targets shall comprise of a minimum of TWO 20 m diameter graduated circles.  The 

            graduations shall be in radius steps of 2 metres. Organisers will normally allocate particular frequencies to 

            each circle.

(b)        The circles must be laid out in a line at right angles to the wind direction.

(c)        Competitors and officials (time-keepers) must remain on the upwind side of the

landing circles during the landing process.

(d)        Competitors may only retrieve their models on completion of the landing, provided

they do not impede other competitors and models.

(e)        The organisers will normally provide a landing target for each flyer in the slot.

7.11.6 Scoring

(a)         The flight will be timed from the moment of release until

(i) The moment the model first touches the ground

(ii) The moment the model first touches any object in contact with the ground.

(iii) The completion of the 12 minute slot time

(iv) Motor run time , which must not exceed 60 seconds, to be included.

(b)        The flight score will be composed of ONE point for each FULL second of flight time.

(c)        A penalty of 1 point per second will be deducted from the flight score for overflying the end

of the slot time for up to a maximum of one minute (the one minute penalty time).

(d)        A zero flight score will be recorded for overflying the end of the one minute penalty time.

(e)        A zero flight score will be recorded for a motor run more than 60 seconds (1 min.).

(f)         Landing Bonus:

A landing bonus will be awarded provided that the model comes to rest within the landing circle. The bonus will be calculated on the distance from the centre of the circle to the nearest point of the model such that

  1. a) a distance of 2 m or less will score 50 points
  2. b)a distance between 2.01 m and 4 m will score 40 points
  3. c) a distance between 4.01 m and 6 m will score 30 points
  4. d)a distance between 6.01 m and 8 m will score 20 points
  5. e) a distance between 8.01 m and 10 m will score 10 points

 (g)       The competitor who achieves the highest aggregate of points, i.e. flight points plus

            landing bonus points less penalty points, will be awarded a corrected score of one

thousand points for that slot.

(h)        The remaining competitors in that slot will be awarded corrected scores calculated

as a proportion of the winner’s score, i.e. the competitor’s own flight score

(including the landing bonus but excluding penalty points) multiplied by 1000 and

divided by the slot winners flight score (including the landing bonus but excluding

penalty points).

7.11.7 Final Classification

(a)        The competitors final score will be the aggregate of points for all rounds flown.

(b)        There will be no fly-off.

7.11.8 Timing (Additional to details in 7.11.4)

(a)        Each competitor shall be accompanied by a timer whose primary responsibility is

to provide the CD with the flight and motor run times as previously described. The

timer is to exercise particular care to start the stop watches at the launch of the

model and not at the start of the timing slot.

(b)        As a secondary function, the timer may advise the contestant regarding the

progress of the slot times and the performance of the other competitors.

(c)        Recorded times will be expressed in whole seconds, rounding up for the motor run

and rounding down for the flight duration time.

(d)        The competition may be run by the use of an automatic slot timer The audible signals from

            such a timer at the commencement of, during, and at the conclusion of the slot are considered to 

            satisfy 7.11.4 (g), (j), (k), (l) and (m).  Organisers may adopt an alternative procedure such that 

            each individual timer times his competitor for a slot which starts when the model is launched within 

            a ten second window announced by the CD. Remaining procedures are as indicated with each timer 

            giving the appropriate signals to his competitor.

(e)        Competitors may not run their motors at any point between the CD’s

announcement that the slot is about to start and the signal that the slot has started.

7.11.9 ALL OTHER RULES ARE AS ‘F3J – Thermal Duration Soaring’ (Section 7 3.)

 

7.23 ELECTROSLOT 400 (E-400)

 

 7.23.1 Objective

 To provide a silent flight class to complement Electroslot (E-Slot). This class has been devised to utilise 

the readily available and inexpensive Speed 400 motor and to have a minimum of restrictions.

 7.23.2 Model Characteristics

 (a)        Maximum Surface Area…………………………………………………….150 dm2 (2325 in2)

             Maximum Flying Weight…………………………………………… 5 Kilograms (11.023 lbs)

             Maximum Surface Loading……………………………………….75 g / dm2 (24.51 oz / ft2)

Minimum Surface Loading………………………………………….12 g / dm2 (3.95 oz / ft2)

 (b)       Power source must not exceed 7 Ni-Cd cells

 (c)       The motor may be any ferrite motor based on the Mabuchi 380 RS (Speed 400 or

            similar). Direct drive or with gearbox. No reworking of the motor is allowed.

(d)       The motor run per round shall not exceed 90 seconds (1.5 minutes).

 7.23.3 Battery Charging

 Cells may be charged between rounds.

7.23.4 Organisation of the Flying Slot.

(a)         As Electroslot (7.11 4)

(b)         The flying order must be scheduled in multiples of three rounds sub-divided into time slots.

(c) to (m)  As Electroslot (7.11.4)

 7.23.5 Landing

(a)   to (e) As Electroslot (7.11.5)

7.23.6 Scoring

 (a)       The flight will be timed from the moment of release until

(i) The moment the model first touches the ground.

(ii) The moment the model first touches any object in contact with the ground.

(iii) The completion of the 12 minute slot time.

(iv) Motor run time, which must not exceed 90 seconds (1.5 mins), to be included.

 (b) to (d) As Electroslot (7.11.6)

 (e)       A zero flight score will be recorded for a motor run more than 90 seconds (1.5 minutes).

 (f), (g) and (h) As Electroslot (7.11.6)

 7.23.7 Final Classification

         As Electroslot (7.11.7)

 7.23.8 Timing

         As Electroslot (7.11.8)