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HelicopterRadio - Servo - Gyro - Gov - Batt › Gryo 401 No Lock and Creep
09-16-2007 09:36 PM  10 years agoPost 1
HeliSmoke

rrApprentice

Washingtonville Ny

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I dont get this please help.
Raptor 50 Gyro 410 Dx 7
If i power up the reciever with the radio on in normal mode the gryo will lock but when i move to idle up 1 the gryo flashes and creeps clock wise.

9254 servo...

If i power up the reciever with the radio on while in idle up 1 the gryo will then lock but if i move it to normal mode it then flashes and creeps Counter clock wise I dont get it

another strange thing is when i move the rudder back and forth quickly then stop the servo stops then kinda like snaps itself to position

i just dont know i spent hours on this

thanks in advance ,,, gary

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09-16-2007 09:55 PM  10 years agoPost 2
Angelos

rrKey Veteran

nr Oxford, OX11, UK

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The DX7 has different trims for Normal and Idle. Make sure rudder trim in all modes is set to neutral.
another strange thing is when i move the rudder back and forth quickly then stop the servo stops then kinda like snaps itself to position
Read the gyro user guide.

-Angelos

Spartan RC R&D

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09-17-2007 06:27 PM  10 years agoPost 3
BarracudaHockey

rrMaster

Jacksonville FL

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He's got your flight mode problem nailed, zero the trim in all flight modes.
another strange thing is when i move the rudder back and forth quickly then stop the servo stops then kinda like snaps itself to position
You are making the gyro rememorize its center position. Its working as designed.

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

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09-17-2007 11:15 PM  10 years agoPost 4
RCMed-x

rrVeteran

westpalmbeachflorida usa

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You might be using gyro function with gains to low

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09-18-2007 07:23 AM  10 years agoPost 5
djMidnight

rrApprentice

Petaluma, California

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Not only do you have to make sure the trims are set the same in each flight mode (usually zero), you also have to make sure the gyro setting itself is the same, or at least the desired setting for each mode.

Go into the [Gyro Sens] menu, and flip the flight mode switch. You'll see a pair of values in the bottom left of the screen, numbered 0 and 1. On the right, you'll see 2 (or 3 if you have auto-rotation enabled) F.Mode values listed. My screen looks like this:
[Gyro Sens]
Auto F.Mode
Norm: 0
Rate: Stnt: 1
0: 80% Hold: 0
1: 85%
That means I have my gyro gain set to 80% in both Norm and Hold modes, and 85% in stunt.

You probably changed your 0 mode, but didn't change the other one (I think it defaults to 50%). As soon as you flip the switch to stunt, your gyro is switching out of heading hold mode. That's causing your tail to drift because you probably didn't set the trim for it in normal mode, which you should do.

pH7 just posted this link on another thread - You should read it:
http://www.raptortechnique.com/gy401-dx7.htm

Jason

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