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04-24-2009 02:44 PM  9 years agoPost 1
Nickvon

rrNovice

London, England

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Hi all,

I have a trex 600, with a GY401 and an S9254 gyro setup and I have a JR x-378 transmitter. Until now I have been adjusting my gyro gain by changing the gear travel adjustment, and having the ability to switch it on or off, ie. HH and non-HH. This is practical upto a point, because I can only have 1 gain sensitivity setting for both normal flight mode and idle up 1 (or full 3d). When i hit idle up 1 with HH selected, I get a very twitchy tail, it's just too sensitive. My manual has offered a solution, I can use the Automatic Gyro Gain Function to set two gain values ie. higher sensitivity for normal and lower sensitivity for idle up, and I assume by magic it's able to determine which flight mode I am in. Now it makes a footnote about plugging my gain wire (the yellow lead) into the aux2 reciever socket, meaning I obviousloy wont be using me gear socket, or the gear travel adjustment anymore, am I correct in this assumption. That's question 1, now what happens to my HH, is it now permanently on? How do I switch between HH on and off?? Ort does more magic happen in my transmitter and it just knows?!! I call on you heli geniuses out there to help me.

Thanks in advance

Nick

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04-24-2009 02:47 PM  9 years agoPost 2
AlabamaRaptor

rrApprentice

Millbrook

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I know you have a Trex 600 but this may be able to help you.
www.raptortechnique.com

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04-24-2009 02:48 PM  9 years agoPost 3
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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When you say the tail is too twitchy, do you mean it's wagging or that it just responds too much to stick inputs?

If you mean it's just too responsive to your stick inputs, that has nothing at all to do with gain. If you want to fix that, change your rudder endpoints, dual rates, or add expo.

As for changing the channel the gain lead is on, you're correct. If you move it to Aux2, then you won't be able to use gear adjustments to change it anymore. There's no reason to switch to aux2 though.

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04-24-2009 02:56 PM  9 years agoPost 4
Nickvon

rrNovice

London, England

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I get violent shuddering, expecially when I bank hard, it's not too responsive to sick inputs. If I use the gear function, I only have one gain sensitivity setting for both normal mode and stunt mode, which is impractical because it's fine for normal flight mode, but too sensitive for stunt mode and wags and shudders. By using the Automatic Gyro Gain Function I can set a different sensitivity for either flight mode, but then what about my heading hold, how do I switch this on and off?

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04-24-2009 03:30 PM  9 years agoPost 5
Nickvon

rrNovice

London, England

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After a bit of fiddling I have linked my gyro sensitivity to my flight mode switch, thus normal mode is going to be more sensitive than idle up. Also if you lower the sensitivity below a certain level, around 50%, my HH led on the gyro turns off, so I have HH on all the time, happy with that. If I am missing the point completely please let me know. Thanks.

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04-24-2009 05:29 PM  9 years agoPost 6
Skarn

rrVeteran

Pasadena, MD

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1) Yes, if you use the GYRO SENSE menu, your gear switch will not control the gyro anymore.

2) Using GYRO SENSE, set it to AUTO F. MODE
What that does is you will be able to set different gains for each flight mode.

It's very easy to setup...for nice video instruction, check out the Finless Bob GY-401 setup vid over at helifreak.

Skarn

It's better to burn out than to fade away...

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04-24-2009 07:04 PM  9 years agoPost 7
Nickvon

rrNovice

London, England

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Of course, it's so simple....not!! No seriously, Skarn you're a legend!!Now I have Normal mode with no HH and idle up 1 with HH and both have different gain values, perfect. What I didn;t know until now is that I actually have to reduce the % value to take me out of HH and give me MORE sensitivity, and the opposite is true for HH.

Cheers

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04-24-2009 08:08 PM  9 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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If you need less gain in Idle up then you're running too much gain in normal mode.

Andy
AMA 77227
http://www.jaxrc.com

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04-25-2009 03:48 PM  9 years agoPost 9
Nickvon

rrNovice

London, England

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Ran her today, and after a few tweaks here and there she runs great! No more overloading the servo in idle up. Thanks all.

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