Protech ZOOM 425 ccpm Specifications download pdf (Page 191)

centage of travel you should use for the transmitter's gyro gain channel.

For example, to set yaw rate mode mode with 40% gain, this would be 50 - (40 / 2) = 30% of

full travel.

30.1.8.1.6. GY401 pirouette rate

The pirouette rate adjustment is done at the transmitter via the rudder channel EPA. 100%

EPA is roughly about 720 degrees/second maximum pirouette rate. Setting this to a lower

value decreases the max pirouette rate, and increasing it will increase the max pirouette rate.

30.1.8.2. GY240 setup

There are only three adjustments on the GY240: direction, gain and pirouette rate.

30.1.8.2.1. GY240 delay setting (fixed)

The GY240 has a fixed delay setting and this is not adjustable. However, the GY240 assumes

a very slow servo, and the fixed delay setting appears to be greater than 100% delay on the

GY401. This is one reason why the GY240 appears to work better with tail motors than the

GY401.

See also the GY401 delay setting for more info.

30.1.8.2.2. GY240 limit setting (fixed)

The GY240 limits are not adjustable.

If you are using a heli with a tail servo, you will need to adjust the mechanical linkages so the

tail pitch slider does not bind at both extremes of travel. Pragmatically, this means you will

need to try different holes in the tail servo horn and/or tail pitch lever until the tail pitch slider

can travel to both extremes without binding.

If you are using a heli with a tail motor ESC, then there is no adjustment required.

See also the GY401 limit setting for more info.

30.1.8.2.3. GY240 direction switch

This functions identically to the GY401. See the GY401 direction switch explanation for more

details.

30.1.8.2.4. GY240 gain trimmer

The GY240 gain trimmer works similar to the GY401 gain trimmer, however the GY240 gain is

less sensitive than the GY401 gain. My rough guess is the GY240 60% gain is about the equi-

valent of the GY401 30% gain.

30.1.8.2.5. GY240 pirouette rate

This GY240 pirouette rate is configured in the same way as the GY401 pirouette rate.

However, the maximum piroutte rate is only about quarter that of the GY401.

30.1.9. Yaw-rate gyro technical info

The gain on a yaw-rate gyro functions differently than on a heading hold gyro. It controls how

much the gyro dampens (works against) movement. This is fine if you are not using the rudder.

However, if you use the rudder, a yaw-rate gyro will dampen this movement too.

Technical Appendix

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Protech ZOOM 425 ccpm Specifications Page 191