Robbe Electric dual-rotor helicopter RtF (S2539) S2539 データシート

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Take-off: raise the rotor speed slowly and steadily until the model 

hovers at eye-level. At the same time adjust the trims until the 
helicopter flies stably and hovers over one point. At low height 
(approx. 10 - 15 cm above the ground) the model cannot be trim-
med accurately due to the turbulence generated by the rotor. 

Landing: slowly and steadily reduce the throttle setting until the 

model descends and touches down. Never reduce the throttle 
setting abruptly.
After the landing disconnect the flight battery from the receiver, 
and only then switch the transmitter off.  

Caution: stopping (obstructing) the rotor blades when they are 

turning can cause serious damage to the mechanical system, 
and may even result in a fire. Immediately move the throttle stick 
to Idle if this should happen.

Note regarding the flight battery: as soon as you notice a red-

uction in motor power, land immediately and disconnect the bat-
tery. Never continue flying until the battery is flat, as this causes 
a deep-discharge condition which results in permanent damage. 
Allow the battery to cool down before recharging it.

Replacing the rotor blades: if a rotor blade is damaged, replace 

it immediately. When fitting the new rotor blade, tighten the retai-
ning screw just to the point where the blade still swivels smoothly.

Before the first flight it is important to set all the trims - except for 
the throttle trim - to centre. The throttle stick must be in the "fully 
back" position (towards you). If the rotor blades turn, adjust the 
throttle trim until the rotor blades come to a halt. 

Ideally the first flight should take place in a large indoor space 
devoid of obstructions. If you have to fly the model in the open air, 
wait for a day with totally flat calm conditions.

Open the transmitter battery compartment and insert the four AA 
cells* (check for correct polarity).

Switch the transmitter on. The battery status is shown is shown 
on the left of the screen. Move the throttle stick and trim to the 
"fully back" position. Otherwise the motors will not start. 
Slide the fully charged LiPo flight battery into the support frame 
on the helicopter with the contacts on the underside.