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52
Flying with SAFE
®
Technology
First Test Flight
If not done already, for the first flight keep SAFE
®
technology deactivated and adjust all flight
parameters like tail gyro gain, cyclic gain, etc.
If the heli is setup well, you can familiarize yourself with the effect of SAFE
®
technology. For
this we suggest to use the “Bail out rescue mode.” Fly the helicopter in a sufficient amount of
height in a stable hover and activate the SAFE
®
technology by using the appropriate switch.
The helicopter should continue to hover in approximately the same position. Now give some
aileron or elevator stick input and release the stick when the helicopter reached some oblique
position. SAFE
®
technology should bring the helicopter back to the horizontal position more
or less rapidly.
Deactivate SAFE
®
technology and again tilt the helicopter by giving some stick input. The
helicopter will stay tilted if you release the stick. Only when SAFE
®
technology is activated by
flipping the switch again, the helicopter will be rotated back to its previous horizontal position.
If using a SAFE
®
technology operation mode with collective pitch control, moving the
throttle stick does not have any effect in some area as SAFE
®
technology takes over
collective pitch control as long as the throttle stick is in this area and SAFE
®
technology
is activated. Therefore, verify the throttle stick is in a position that will roughly produce
the same amount of collective pitch, before and while deactivating SAFE
®
technology.
Otherwise when deactivating SAFE
®
technology the helicopter would make a leap down,
if the throttle stick controls a smaller pitch angle than SAFE
®
technology. To prevent this
you can optionally enable a throttle stick lock with the StudioX software and the optional
USB2SYS (SPMA3030 or BTXA76007) interface.
For safety reason you should never take off or land with activated SAFE
®
technology.
As SAFE
®
technology actively gives control commands to the control loop of Spektrum
AR7210BX, the swashplate may tilt to one side if the helicopter is not placed perfectly
level on the ground. This may cause the helicopter to tilt and crash when trying to take off
or when the motor is switched off and the main rotor is running out.
Fine Tuning SAFE® Technology
The amount of deflection of the SAFE
®
technology switch channel controls the SAFE
®
technology gain. This determines the speed and roughness of the control input from SAFE
®
technology. If the effect of SAFE
®
technology is too low the heli rotates back to horizontal
position too slowly, increase the SAFE
®
technology gain by increasing the deflection of the
SAFE
®
technology channel (i.e. by using the servo throw adjustment for this channel in the
transmitter). If, on the other hand, the heli overshoots after reaching neutral position and bobs
briefly, the SAFE
®
technology gain might be set too high. Reduce the gain accordingly. Verify
that cyclic gain (dial1) and cyclic feed forward (dial 2) are well adjusted. It is recommended to
adapt the SAFE
®
technology gain to the preferred application. If you would like to use SAFE
®
technology as emergency rescue then set the gain as high as possible. On the other hand when
using SAFE
®
technology mainly as a training aid, for example in 3D — mode, then make the
effect of SAFE
®
technology rather weak, so that the system does take over control gently.
52


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