Specifications

A heading hold gyro is highly recommended for beginners. There are four reasons for this:

• A heading hold gyro is much easier to configure than a yaw rate gyro. The yaw rate gyro

requires the revo mix curve to be set up correctly before learning hovering, and this is tricky

to set up for beginners.

• The heading hold gyro will "lock" the tail at one heading rather than just dampening random

tail movement. This is very good because you only need to learn two joystick axes initally

instead of three. This means you can learn the right joystick first, then learn the left joystick

later(for mode 2) instead of trying to learn both joysticks simultaneously. This makes learn-

ing hovering much, much, easier.

• The revo mix (required for a yaw rate gyro) will not compensate for the battery voltage

dropping as the battery discharges. So, near the end of a flight, you will need to hold some

rudder to keep the heli from turning. This makes learning hovering more difficult.

• A yaw rate gyro will require the revo mix to be changed every time the weight or headspeed

changes.

• If you install a modification which changes the heli weight, you will need to readjust the

revo mix.

• If you change the pinion to a different tooth count, you will need to adjust the revo mix.

• If you have battery packs which are different weights, you will need to adjust the revo

mix between packs.

The differences between the GY240 and GY401 are:

• The GY401 has a DS mode switch to enable a high-speed (200 hz) update for digital ser-

vos. The GY240 does not have a DS mode switch, but will still work with digital servos us-

ing the normal update rate (50 hz).

• The GY401 has a limit adjustment so the tail servo travel can be electronically limited as

well as mechanically limited. The GY240 does not have a limit adjustment so the tail servo

travel can only be mechnically limited.

• The GY401 has a remote gain lead (which plugs into a receiver channel) so the gyro gain

can be set from the transmitter. This lead MUST receive a valid transmitter signal and can-

not be left unplugged. The GY240 has a gain adjustment on the gyro and does not support

remote gain.

• The GY401 has a very fast pirouette rate. The GY240 has a very low pirouette rate.

Helicopter Parts Selection