CGY750 V1.2 Basics

by Nick Maxwell

January 11, 2012

With V1.2 you are able to really improve the flight performance of the gyro by using the added mixes to help get the model to stay at the same attitude in fast collective changes and rolls. These parameters will differ from model to model depending on blades, servo horn length and swash ATV settings in the 750. But basically, you use those mixes (note some will change from A>B and B>A with collective, and some will change with cyclic, that means it is important to set 0 degrees pitch at 50% collective).

For those that change with collective, best way to adjust is to do long climbs, and adjust the corresponding number, ex. on full collective climbs; the nose will pull up, and with negative pitch descents; the nose will drop, using the PIT>ELE to mix, add the right amount of elevator into the collective input to achieve a flat climb and descent. You will also want to do the same with PIT>AIL.

The AIL>ELE is for rolls, say your model is exhibiting a cork screwed roll or lifting the nose in rolls, using the corresponding number for that input in the 750 will let you add the correction needed to keep the roll axial. (generally right aileron requires a slight amount of down Ele, left rolls require a nudge of up Ele.)

Two other parameters that are asked about a lot are the AVCS.DMP and the Rate.CST as they will greatly affect the flight performance on the original version all the way to V1.2.

Here's just a brief description on those:

AVCS.DMP, this gain is used to fine tune how well the gyro is holding the model's heading when not giving a cyclic input. Say for example if you are in fast forward flight and the model wants to pull its nose up, increasing the AVCS.DMP will help keep that axis tracking better. Similar as in rolls. If you get the number too high, the model will tend to want to "stick" to a position after a pilots inputs, and also harder to change cyclic directions quickly.

Rate.CST will in theory keep the roll and flip rates similar whether stationary or in fast forward flight. Since inherently it takes more cyclic to maintain a stationary axis change than a traveling axis change sometimes the flip speed can drastically change from stationary to traveling. By increasing Rate.CST you will keep the same stationary rotational rate, but slightly slow down the traveling rotational rate to make the system feel more balanced. If the number is set to 150 (40 stock I think) you will get very similar rates. By playing with that number, you can settle on something based off personal preference that suits you.

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