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**Tez** · 15-11-2005, 10:03 PM

Im no expert but heres how I believe it works.

You use channel 5 for the gyro which is a switch, the switch switches between Heading hold and normal. You can adjust the gain on the gyro for each mode by using the EPA on channel 5. To start with it is recomended that you set the pitch on the rear blades to about 8 degrees when sticks are central, also turn off all rev mixing. you should set the gyro gain to about 60% and adjust when in the hover e.g. if you get drifting increase the gain and if you get tail wag decrease the gain.

The difference with the gyro modes is that when in Non Heading hold mode, a heli starts to yaw either through torque or wind and the gyro will sense the swing and apply a correction, but once the tail swing has been stopped the gyro will return the tail servo to neutral, by which time the heading has changed.
But in Heading Hold Mode the gyro will keep the corrective input in until the helicopter has returned to the original heading.

hope this helps

**Ade_Law** · 16-11-2005, 12:31 PM

spot on tez.

that is also the reason the pitch slider will move to full travel on the ground if you hold a small amount of rudder in. The gyro sees the model not moving and tries harder to push the tail to where you are asking it to be.

Ade

**phil485** · 16-11-2005, 02:34 PM

So forgive the idiot here

I would want to use heading hold if I was hovering so that it would "lock" the nose in one direction, but switch to normal for circuits so as to correct for gusts etc.

What other benefits are there. I only have a very basic and old futaba gyro ( about 12 years old). I have considered replacing it but what are the benefits

**Ryno** · 16-11-2005, 02:42 PM

Thanks Tez & Ade.

Can you tell me what the relationship is between the EPA adjustment on my gyro channel and the sensitivity percentage adjustment in my Gyro sensitivity menu on my 9c.
Ade, will my pitch slider move all the way in both HH and normal mode with small stick movements and why does this change if I reduce the EPA for my rudder channel.

Ryno

**Tez** · 18-11-2005, 07:50 PM

I think the gyro sensitivity setting is redundant with HH gyros as its not used. You just adjust the sensitively with the EPA.

**Tez** · 18-11-2005, 07:54 PM

[quote=phil485]So forgive the idiot here

I would want to use heading hold if I was hovering so that it would "lock" the nose in one direction, but switch to normal for circuits so as to correct for gusts etc.

What other benefits are there. I only have a very basic and old futaba gyro ( about 12 years old). I have considered replacing it but what are the benefits[/quote]

No you can use Heading Hold for circuits! It does not only point in one direction, it just holds the heading when the stick is centred.

**Ade_Law** · 18-11-2005, 11:20 PM

gyro sensitivity: aka gyro gain on futabas that is channel 5 you can either use the EPA or the gyro screen

it doesnt really make much difference accept that the values are different. EPA 100 = 100% gain, 0 = 0 gain,

when using the gyro screen 50 = 0 gain, 100 = 100% gain.

you increase the gain value in HH until it wags then back it off a bit.

so not exactly redudant.

now, the epa of channel 4 (rudder) can affect the range of the tail rotor travel at very low values so you need to be setting the limit pot (on the gyro) with epa in the transmitter of >85%

with small stick movements it will only go to full travel in HH not normal mode.

beware that the 401 needs to be powered on in HH mode or it will not work correctly, I fly in HH mode all the time the reason for this is when you get into backwards flight you are going to need to use HH might as well get used to flying circuits in HH now.

Ade

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