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 Learning to Fly

Trouble Shooting


Charger alarm calls when set to charge battery
  • The charger is not connected correctly to the battery.
  • Ensure that the battery connects to the charger by both the XT60 connector, and the small white balance lead.
  • The small wires can be fragile, confirm they have not been disconnected to the white fitting.
  • Check that the battery has not fallen below its minimum voltage. If so, discontinue its use and dispose of the battery appropriately.
No power to Rofalcon once battery is plugged in
  • Ensure that the yellow connectors (XT60) have not been damaged, and that the battery wires are secured well at the solder joint.
  • Ensure that the power lead from the speed controller to the receiver is connected correctly.
  • Check that the battery is fully charged with a volt meter.


Rofalcon beeps continuously, throttle will not engage
  • The Electronic Speed Controller (ESC) has detected throttle input the second the battery was connected. As a precaution the motor has not been armed. Move the throttle to the lowest position, and move the throttle trim down until the Rofalcon responds.
Engine turns very briefly, then will not continue
  • The battery is very low, and so as not to ruin the battery, the ESC has halted the thrust. Fully charge battery.
Engine will not start, even though the initial beep noises have been made
  • Check that the engine is connected to the speed controller and that there are no signs of damage to the 3 engine wires.
Engine turns the opposite way
  • Disconnect battery. Disconnect the 2 of the 3 engine wires from the ESC. Reconnect them the opposite way around.
Rocrow is lacking in thrust
  • Check that the fan blades are intact and in good condition.
  • Feel the battery, is it puffy and worn out?
  • Calibrate the throttle: Turn on the transmitter, with throttle to the highest point and throttle trim in the middle, turn on Rocrow, wait for it to beep, put throttle to the bottom, wait for a beep.
  • Test the power output of the engine: Turn on the Rocrow and transmitter, leave the wings unconnected. Put the nose of the Rocrow vertically down on some digital scales and zero them. Power full throttle down into the scales, keeping the Rocrow balanced.
  • Record the weight in grams. It should sit around 630-670g!


The elevons steer the Rofalcon in the opposite direction
  • The connectors from the wing to the fuselage are the wrong way around.
One elevon does not respond to inputs
  • Check that the servo wire is connected firmly into the fuselage.
  • Unplug the wing and move the elevon manually. If there is resistance, or a grinding feel, the servo is damaged and must be replaced.
Neither elevons respond to inputs
  • Check that the wing servo wires are firmly connected to the fuselage, and that the small double wire extension is connected to the top 2 ports on the stabiliser unit.
One elevon moves correctly, the other moves erratically
  • The double wire extension is connected incorrectly to the stabiliser. Ensure it occupies the highest two ports on the stabiliser unit.
The Rocrow is difficult to steer, even with the stabiliser on
Turn the stabiliser off and check that both wings move an equal amount in every direction. · Check the centre of gravity is correct. You can find more about the Centre of gravity by clicking here.


The aircraft gradually turns, gains/loses height as it travels with the stabiliser on full
  • Very gradually change the trims to correct for any deviation until the model flies straight into the wind.
The model flies well without the stabiliser, but violently changes direction once the stabiliser is engaged
  • Carry out pre-flight checks, ensuring to keep the model level and still for 5 seconds once the battery is connected.
No Signal between the Rocrow and the Pilot
The Roprey can be controlled up to a distance of 1.4 kilometers. However, this is significantly beyond the range a pilot can control the aircraft for a line of sight flight. In the event of the aircraft losing transmitter signal the engine will be stopped, and the stabiliser engaged. This will limit the distance the model travels and encourages a gradual, gentle descent. To reduce the risk of signal loss, ensure that the transmitter aerial is angled at 45 degrees and not pointing directly at the aircraft. Ensure the transmitter is kept switched on in the case of signal loss, so that it may be recovered. It is advisable to fit a falconry transmitter to the model so that it may be recovered in the case of signal loss or pilot error. Should the aircraft need to be re-bound to the transmitter, then please follow the procedure by clicking here