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 backBack to Set Manoeuvres List    Metronomes

The Vertical Metronome
The Horizontal Metronome

Description
The manoeuvre consists of a repetitive metronome with 6 pitch reversals. The metronomes should be symmetrical about the centre-line and retain consistent height and speed throughout. The metronomes may be performed with the tail boom vertical or horizontal. The diagrams show recommended orientation of these to give the judges and you the best perception of the manoeuvre.

Preparation
This should begin with your model, as metronomes are demanding on the engine and servo performance of your machine. Your engine should be in good condition and your cyclic/pitch servos should be suitably fast and powerful. If you have not yet performed metronomes these may be developed along the lines detailed in the November 2006 Idling Up article. Here we examined how a beginner may start with some initial pitch control exercises from the hover and develop the necessary cyclic and pitch coordination. If you are a beginner the first decision to be made is, are your metronomes to be tail boom vertical or horizontal? By attempting both options this decision will be made for you, as one type will almost certainly prove to be favourite. In the case of the tail boom vertical metronome you should practice plenty of examples ranging from slow arcing ‘rainbows’ to the most aggressive metronome your model can handle without descending. Here you should aim to develop good elevator/pitch co-ordination to produce the required ‘stationary’ metronomes that are symmetrical and retains constant height. The diagram indicates a ‘tail-down’ metronome but you may attempt nose-down examples if you feel confident at doing so.

If you opt for sideways metronomes, the same advice applies, except of course, your aileron control replaces elevator as the primary cyclic input required. This is shown in the diagram, and I would suggest starting with quite slow ‘arcing’ attempts before speeding up the manoeuvre to the most aggressive possible with your model. Again, from here select the best compromise between the two extremes that offer a crisp manoeuvre that is well controlled and symmetrical. The diagram shows a tail-in configuration, but if you wish to fly nose-in this is quite acceptable.

It is important to practice your chosen metronomes with your caller, as 6 pitch reversals are required. Make sure your model is established in steady metronomes before the start is called. Your caller should then carefully count the 6 reversals before indicating the finish.

Possible Problems
Height and position control are always challenging during repetitive metronomes. It is important to settle the model into a steady series of metronomes that give you the opportunity to correct for position and height. Take care not to be too aggressive as this often leads to a situation when the model begins to descend and you are then forced to open out the metronome to retain height. The judges will be looking for consistency throughout the manoeuvre so aim for a metronome rate is that is comfortable for the model and you.

 

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