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 backBack to Set Manoeuvres List    Four Point Backward Rolls x 2

4 point backward roll

Description
The model should be flown backwards at medium speed and two full aileron rolls completed with each roll being clearly delineated by 4 hesitation points. The judges will expect the completion of the first full roll and start of the second to be on the designated centre-line as shown in the diagram. Backward speed should be maintained throughout, and a clear hesitation performed with the rotor disc horizontal and vertical as shown.

Preparation
Fundamental to this manoeuvre is, of course, ensuring you are completely happy with backward rolls. I would suggest beginning with a single backward roll with no hesitations. Aim to practise a smooth, slow, backward roll that maintains good height and speed consistency. The next step is to add the second roll to produce a flowing symmetrical manoeuvre that retains height and speed with the end of the first/start of the second roll directly in front of you. It is now time to go back to the single backward roll, but now with some hesitations included. I would suggest trying just the inverted horizontal position first. This is less demanding than the 2 knife-edge position and any height loss can be corrected. The timing of your cyclic inputs may also be assessed during this practice to ensure well-defined hesitations. With these horizontal hesitations mastered, it is time to try to the knife-edge positions. You must aim to produce a defined knife-edge hesitation with minimum height loss. Begin with one knife-edge hesitation before introducing the second.

Flying the Manoeuvre
This may be flown in either direction – the choice is yours. Your practice will help you decide if flying into wind or downwind is preferable. If flying downwind the model will cover more ground but will retain more inertia that may help overall speed retention.

The manoeuvre should be entered at moderate backward speed and the roll commenced. The first knife-edge hesitation should be introduced to occur with the rotor disc vertical – the model will be to one side to you allowing easy assessment for you (and the judges). The hesitation at the inverted part of the roll allows a brief opportunity to correct any height loss. Also a tail-down attitude is necessary during the horizontal sections to retain backward motion. The completion of the first roll offers the opportunity to correct for any small positioning and speed errors before beginning the second roll to ensure a symmetrical overall manoeuvre.

Possible Problems:
Maintaining backward speed often proves difficult especially during the latter part of the manoeuvre. Concentration is often centred on producing accurate hesitation points at the expense of speed control. At all points when the rotor disc is horizontal you have the opportunity to bring the tail down with elevator control to keep the model moving backwards.

Rushing the manoeuvre usually causes missing or erratic hesitations. The overall roll rate must be slow enough to give time to introduce defined hesitations.

 

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