SPEKTRUM DX7 • HELICOPTER PROGRAMMING GUIDE SPEKTRUM DX7 • HELICOPTER PROGRAMMING GUIDE
Pitch Curve
Adjustment of the pitch curve is very similar to the throttle curve adjustment described in the preceding section.
A thorough understanding of the throttle curve section will make pitch curve adjustment easier to understand.
The DX7 offers four (4) independent pitch curves: Normal, Stunt 1, Stunt 2 and Hold. Each pitch curve contains
five (5) adjustable points — L, 1, 2, 3, and H.
Note: When setting pitch curve for throttle hold, it is necessary for the throttle hold to be active
— if this function is inhibited, the throttle hold pitch curve will not be visible on the screen.
In the Function Mode, use the UP and DowN keys to select PITCH CURVE.
To Access the Pitch Curve Function
Press the DowN and SELECT keys simultaneously to access the System Mode.
In System Mode, use the UP or DowN key to select the PITCH CURVE NORM screen.
Press the SELECT button to access pitch points L (Low), 1, 2, 3, or H (High) or EXPO.
Press the INCREASE or DECREASE key to change the selected pitch value or expo on/off.
Hovering Pitch Rocker
The hovering pitch rocker operates in the same manner as the hovering throttle rocker. It is operable while the
flight mode is in the N, or Normal, position, and its function is to shift the center point (#2) of the curve either
upward or downward to adjust pitch at the hover position.
Revolution Mixing (only used with non-heading hold gyros)
The Revolution Mixing Function mixes tail rotor input with the Throttle/Collective function to counteract torque
from the main rotor blades. When set up correctly, the helicopter should climb and descend without a tendency
to yaw in either direction. Because torque reaction varies with different power settings, it is necessary to vary the
tail rotor pitch at the same time. The DX7 offers two (2) separate revolution mixing programs with independent
up and down mixing for each—one for flight mode position N, and the other for Stunt 1 and Stunt 2 positions.
The U, or Up, mixing adjusts the tail rotor compensation for the mid to high throttle/stick setting, and the D, or
Down, mixing adjusts the tail rotor compensation for the mid to low throttle/stick setting.
In the Function Mode, use the UP or DowN key to select the Revolution Mixing screen.
Setting Up Revolution Mixing
First, adjust the helicopter so that it will hover in a neutral position with the tail rotor trim at center. Next,
establish the helicopter in a stable hover; then steadily increase the throttle to initiate a stable climb. The body of
the helicopter will move in the opposite direction to the main rotor rotation. Increase the U, or Up, setting until
the helicopter will climb with no tendency to turn or rotate. At a safe altitude, close the throttle and the helicopter
will descend with the body turning in the same direction as the main rotor. Increase the D, or Down, mix until
the helicopter descends with no tendency to turn or rotate. When attempting this procedure, throttle stick
movements should be slow, and the initial acceleration and deceleration swings should be overlooked.
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