Class F3N, Annex 5F – Manoeuvre Descriptions & Diagrams: Optional Manoeuvres
5F.3 CLASS F3N OPTIONAL MANOEUVRE LIST
The Optional Manoeuvre list will be available from the F3 Helicopter Subcommittee Chairman at the
beginning of each year.
The optional manoeuvres will be labelled B1 through B10.
Each year the optional manoeuvres will be modified or changed to adapt to the rapidly evolving F3N
class. Organisers of F3N competitions must announce the use of a new list if appropriate at least 6
months prior to the event. The following will apply:
-
For World or Continental Championships all optional manoeuvres must come from the annual list.
-
For National Championships it is recommended that at least 5 manoeuvres should come from this
list.
-
For local competitions the organiser does not have to use manoeuvres from this list.
Number Description
B.1
K-Factor
Two opposite pirofunnels
10
MA enters in inverted forward flight, performs a quarter pirouette and starts an inverted funnel with
the tail pointing to the centre. When it crosses the centreline it enters a circle and starts pirouetting
in a way, that after each quarter circle the fuselage has changed its direction 180° (e.g. model starts
from right to left, after a quarter circle the tail points to the flightline, after a half circle away from
centre, after 3 quarters to the flightline again and after the circle to centre again). After one circle the
pirouetting direction is changed, and a second circle follows with the same conditions for the
pirouette. After the second circle MA exits the manoeuvre in inverted forward flight.
B.2
Rolling combination
11
MA enters in forward flight and starts a half rolling circle at the centreline. When it reaches the CL
again it changes the rolling direction and enters a full rolling loop. After that it performs a half
pirouette when crossing the CL and continues with a half backward rolling circle. When it crosses
the CL it again changes the rolling direction and enters a full backward rolling loop. It exits the
manoeuvre in backward flight.
B.3
Four 270°-Turns
9
MA enters in upright backward flight and performs a quarter loop to vertical flight. On the top the MA
performs a 270 degree turn to a vertical descent sidewards, followed by a half inverted loop
sidewards to vertical flight and another 270 degree turn in the same direction as the first. MA
continues until 4 turns (all in the same direction) are completed and exits in upright backward flight.
B.4
Rolling circle reversal
9.5
MA enters in forward flight and performs a horizontal circle while it performs axial rolls. The direction
of rotation of the rolls must be changed after each quarter circle without hesitation between the rolls.
MA speed, rolling rate and the radius of the circle should be constant.
B.5
Galaxy
10.5
MA enters in upright flight, performs a quarter pirouette and starts a funnel with the tail pointing to
the centre. During the funnel the radius of the circular flight path decreases and the declination of
the rotor disc increases, so the path becomes a spiral. After 720° (2 spiral shaped "circles") the
declination should be about 60°. Then a smaller half funnel follows where the declination of the rotor
disc becomes vertical when the model crosses the imaginary centre point of the funnel spiral. When
MA crosses this point it performs a half pirouette and immediately continues with a small half nose
down inverted funnel (the flight path has the shape of an S here when viewed from above), followed
by two inverted funnels (the nose now pointing to the circle centre) with increasing radius (and
decreasing declination of the rotor disc) and exits the manoeuvre in inverted flight in the same
direction but in a different distance as the entry.
During the manoeuvre the height of the flight path must be changed to be symmetrical to the point
where the model crosses the centre point, i.e. it may climb during the first 2 1/2 funnels and decline
during the second 2 ½ by the same amount.
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Class F3N, Annex 5F – Manoeuvre Descriptions & Diagrams: Optional Manoeuvres
B.6
Cuban 8 with roll reversal
10
MA enters in upright backward flight. When crossing the centre line it start continues rolls. While
rolling, MA performs half Cuban 8 parallel to the flight line. Symmetrically around the centreline, MA
stops rolls, performs half pushed elevator flip, and restarts rolling in opposite direction. MA is now in
forward flight while rolling. MA then performs second half of the Cuban 8 while continuously rolling.
Symmetrically around the centreline, MA stops rolls, performs half pushed elevator flip, and restarts
rolling in the same direction as was used at the manoeuvre start. MA stops rolling and exits in
upright backward flight.
B.7
Vertical tic-toc eight
10.5
MA enters in upright forward flight and performs a quarter roll to knife edge tic-tocs. Model then
performs a half tic-toc loop. On the top of the loop MA performs a half pirouette, and then continues
up with another half tic-toc loop while keeping the tail in the flight direction. On top of this second
circle MA performs a half roll. It completes the upper tic-toc loop with the tail in the flight direction. It
then performs another half pirouette and completes the lower tic-toc loop with the nose in the flight
direction. Model exists in upright forward flight
During the manoeuvre the longitudinal axis of the model always follows the flight path
B.8
Pirofunnel reversal
10
MA enters in inverted flight and performs a quarter pirouette (tail turns to circle centre) to enter a
funnel at the centre line. It continues without hesitation with one complete pirouette until after a
quarter funnel the tail points again to circle centre. It continues the funnel with one pirouette in
opposite direction until half of the funnel is completed, then changes the direction of the pirouette
again for the third quarter of the funnel and again for the fourth quarter. After the funnel is completed
the last pirouette is followed without hesitation by another quarter pirouette to the exit in inverted
flight. The diameter of the funnel should be at least 20 metres.
B.9
Double pirosnake reversal,
10.5
MA enters in upright backward flight, starts pirouetting and then follows a wavelike path by
alternately performing upright and inverted circle segments of equal diameter and length. With the
last arc the flight direction is inverted and in the middle of this arc the pirouetting direction is
reversed. MA then continues with another sinuous line by alternately performing upright and
inverted circle segments while pirouetting. There should be at least three complete circle segments
in each direction and the length of the manoeuvre should be at least 40 metres.
B.10
Pirorainbow X reversal
11.5
MA hovers over the centre line with an angle of 45°, then enters the manoeuvre with a rainbow, a
not stationary flip that follows an arched flight path of at least 10 metres length. During the rainbow
the MA performs one pirouette in each direction, with the reverse on the top of the rainbow. Then
another rainbow (with pirouette reversal) leads back to the starting point. MA then continues with
these rainbows alternately about the longitudinal and the lateral axis, until the four outer points of an
X (viewed from above) are reached and MA hovers where it started the manoeuvre. MA does not
perform any part of pirouettes, when hovering in the centre. During the stops at the four outer
points, rotordisk must be horizontal but there should be no hovering.
The Optional Manoeuvre diagrams appear overleaf.
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Class F3N, Annex 5F – Manoeuvre Descriptions & Diagrams: Optional Manoeuvres
5F.4 Optional Manoeuvre Drawings
Optional Manoeuvres 1-6 (of 10)
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Class F3N, Annex 5F – Manoeuvre Descriptions & Diagrams: Optional Manoeuvres
Optional Manoeuvres 7-10
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