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HomeAircraftHelicopterMain Discussion › Slow clockwise drift.
12-03-2012 02:41 PM  5 years agoPost 1
T-Rex-Flyer

rrElite Veteran

Panama City, Fl

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On a T-rex 450 SE My 401 had just die after about 5 years of flawless service, I set up the HG-5000 and HSG-5083 Gyro Pack on the bird that I had on hand.
After watching the videos from the other site, setting it up per the manual and with guidance from Bob's video, setup so in rate mode it's stable in a hover out of ground affect at about 4 feet.
But when I switch to heading hold there is a slow clockwise drift. I can stop the drift with a couple of clicks of left trim (I know now everyone says not to do that, but it works). Other then that it seem rock solid. Not a 3d pilot.
The big question, What could I be doing wrong with the setup? Or is it the nature of that beast.

Also Using a DX8

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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12-03-2012 02:48 PM  5 years agoPost 2
mr dan

rrVeteran

Stockton Calif

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Sounds like you need to adjust your push rod length. Left trim means you are puhing the slider away from the tail case, so try one full twist on the ball link end CCW to lengthen.

"R.I.P Roman" Citizen 0094 in the Nation

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12-03-2012 02:50 PM  5 years agoPost 3
RCHSF

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NC

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Have you got any Neg Pitch dialed into the tail blades? Rudder Stick at Netural in Rate mode, and fold the blades together are they flat with one another? Maybe you got some neg pitch in them.

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12-03-2012 02:54 PM  5 years agoPost 4
jschenck

rrProfessor

La Vista, NE.

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I can't remember specifically on that gyro but some gyro's *require* trim. One example is the JR G500T. These gyro's have a 'fixed' center, unlike the 401 which 'learns center signal' every time it's turned on. If you need a bit of trim on the rudder channel then I'd suggest using sub-trim so it doesn't change for each flight mode - I used to use one - Logictech version, they do work well.

If it hold well in rate mode and you know for certain that there is no trim or subtrim in the radio and it drifts in HH mode you may need sub-trim to line up center from the radio to what the gyro is expecting. You can test this by turning it all on while sitting on the bench. If the servo drifts to one side in HH mode without anything being moved then the gyro thinks it's getting a command to move. use subtrim until this stops. If it doesn't drift on the bench but still moves in the air then I'd look for a vibration somewhere.

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01-05-2013 05:45 PM  5 years agoPost 5
T-Rex-Flyer

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Panama City, Fl

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Thanks jschenck

Sorry for taken so long getting back, I'll try the sub-trim as you suggested. I had heard that some where before, but it just didn't accrue to me to give it a try.
Will let you know how it turns out.

The servo will drift to the right on the bench and some sub-trim will work but only for that test. Once you power up for the next flight/test, the gyro set a new center and the serveo will again drift to the right.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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