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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › G500T: Is this normal
01-18-2009 04:54 AM  9 years agoPost 1
zackesch

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Milwaukee, Wisconsin

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I am getting only about 2/3 range of my stick motion with my servo connected to my gyro. Is this normal?

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01-18-2009 04:55 AM  9 years agoPost 2
QuantumPSI

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Atlanta, GA

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What do you mean exactly?

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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01-18-2009 05:00 AM  9 years agoPost 3
zackesch

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Milwaukee, Wisconsin

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When i move my rudder, my servo stops moving about 2/3 of the way.

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01-18-2009 05:02 AM  9 years agoPost 4
QuantumPSI

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Atlanta, GA

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Is the G500T a heading lock gyro?

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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01-18-2009 05:05 AM  9 years agoPost 5
zackesch

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Milwaukee, Wisconsin

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Yes. It happens when the head lock is on and off.

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01-18-2009 05:15 AM  9 years agoPost 6
QuantumPSI

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Atlanta, GA

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Ok, then I think that's normal. I'm not sure exactly how the G500T works but I'm pretty sure that if you move your rudder stick ever so slightly, the servo will continue to turn until max deflection. The reason for this is that heading hold gyros don't operate the servo the same way the other servos are operated. The other servos on your machine correspond to your stick position. However, with the gyro, your stick position corresponds to a specific pirouette rate and due the gyro software, the gyro is going to continue to adjust the servo until the desired pirouette rate (set by your rudder stick) is reached. Does that explain it?

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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01-18-2009 05:20 AM  9 years agoPost 7
zackesch

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Milwaukee, Wisconsin

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Yup. It makes sense. I was just making sure that nothing was faulty with my gyro.

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01-18-2009 07:20 AM  9 years agoPost 8
PietervA

rrVeteran

New Zealand

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Zakesch, the 490/500 has 3 adjustments on the gyro case: 2 mini-switches (for reversing the servo & Hi/Nor to account for the servo type) and a limit pot, adjusted with a plastic "screwdriver", to ensure the servo travel isn't mechanically limited.

So, go into non-HH, set the tailblades (mechanically) at about 15deg pitch at RUD mid-stick, then move the stick to the maximum L & R, and set the pot so that you get max travel without binding either side. The pot unfortunately adjusts both L & R equally, but that's OK. Also make sure that the slider doesn't move so far away from the boom that the links can knee backwards, thus lock & bind the servo.

Next, set gain to max (on your Tx), and see if the servo slowly drifts/creeps the tailblades L or R. If it does, go into subtrim (which I'm going to assume you had at zero to start off with!), and add enough trim to stop the drift. I've never needed more than 3 or 4 clicks of trim. (You might want to set the increments to single figures on your Tx trim menu, to get fine adjustments.) You've now set the pulse width at which the gyro holds the tail without drifting. Reduce the gain, go into HH, and go fly. When flying, increase the gain until you're just shy of the tail hunting.

(Now I know this is going to upset some people, but remember that ATV doesn't adjust travel; it's there to increase max yaw rate)

Anyway, the above seemed to work for me. (I think it was TMoore who posted a detailed "how to" on this gyro years ago.)

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01-21-2009 05:13 PM  9 years agoPost 9
Oneyeflyr

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Enid, Oklahoma - USA

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G500T
I've got 2 of these G500T's.

One on my T-Rex and one on my MA Fury Extreme.
I've noticed this same problem on my Extreme, but it's the complete opposite on the T-Rex.

I believe that it has to do with the servo that you are using with it.

8700g won't travel very far - Fix is to lengthen the arm of the servo for better resolution.

3500g travel's too far - Fix is to shorten the arm of the servo for less travel, faster response. (hint: find the shortest arm you can find)

This is a good entry level gyro that is very affordable. Works well with smaller craft.

Barry

He who lands hard, makes brown skid marks

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01-22-2009 02:15 AM  9 years agoPost 10
TMoore

rrMaster

Cookeville, TN

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You have to remember, when the gyro is in HH you don't have control over the servo, the gyro does. Having said that, what it means is that you fly the gyro, the gyro flies the tail. On the bench when you command a piro with the rudder stick, the gyro commands the tail servo to move.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › G500T: Is this normal
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