Throttle, Pitch and Tail Curves. Spektrum SPM7800C, DX7s 7-Ch, DX7s 7-Ch DSMX Radio System, SPM55101, DX7s Transmitter Only MD2, SPMR7800

Throttle, Pitch and Tail Curves

The Throttle, Pitch and Tail Curve Screens support changing the relationship between control stick positions (five positions, from 0 to 100%, in 25% increments) and channel output. Curve programming can change channel response from a linear rate for small adjustment of response among flight modes. These functions support adjustment of response during flight modes of N (normal, or 0 on an assigned switch (see Switch Select)),

1 (Stunt 1, or 1 on an assigned switch (see Switch Select)) and

H (Hold on the assigned Throttle Hold switch (see Flight Mode)).

These flight modes are shown as the boxes marked N, 1 and H on the Curve screens.

The screens display a 5-point graph on the left to show the result of the values chosen on the right. Moving the throttle stick moves a vertical line across the curve graphic. Make Expo ACT

(active) to smooth the sharp-angled shape into a curve across the five stick position values.

Throttle Curve

This function supports adjustment of throttle response in three flight modes. When properly adjusted, the main rotor head speed or rpm (revolutions per minute) should remain consistent in all maneuvers and throttle stick positions. A constant main rotor head speed and proper idle speeds improve the operation of other systems. Throttle curves vary among powerplants, so adjust values in test flights to get a consistent main rotor head speed in all flight modes.

Pitch Curve

This function supports adjustment of collective pitch (up and down movement of the swashplate, using available swashplate servos) in three flight modes.

Tail Curve

This function mixes tail rotor input with the throttle/collective function to counter torque from the main rotor blades when using a non-heading hold (tail lock) gyro or when using rate mode on a gyro.

EN

Gyro

The Gyro function supports setting gain for gyros that operate on transmitter programming or with flight modes. Assign the receiver channel connected to the gyro, then assign the switch for gyro options. You can also assign values to available switch positions (from one to three rates are available, depending on the switch assigned). Make sure the gyro operates correctly and compensates in the correct direction.

SPEKTRUM DX7s • RADIO INSTRUCTION MANUAL 15