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HelicopterRadio - Servo - Gyro - Gov - Batt › Trouble with 401/9253
09-02-2003 02:39 AM  14 years agoPost 1
MikeW

rrNovice

Southern California

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I have a raptor 50 v2 with the 401/9253 combo and a 9CHP

I am having problems with the heading lock actually keeping a heading.

In a stable hover the heading slowly changes, very very slowly pirouetting. Probably on the order of 360 degrees/ 1.5 mins

I dont understand why the tail is moving at all.

This happens with the avcs in the gyro menu set to 80, 90, and 100% gain.


The gyro is set to digital mode,
heading hold is active in the radio,
the servo is boom mounted with a cf rod,
there is very little friction in the linkage,
the limiter pot on the gyro is set to about 80,
Im pretty sure the heli is well balanced, no horizontal fin shaking

Let me know what you think,
mike

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09-02-2003 04:51 AM  14 years agoPost 2
Dura-Ace

rrApprentice

Kansas

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Hey Mike,

I had the same problem with my 401. I found that if I moved the helicopter within the first 10 seconds of powering up the gyro the gyro became confused. I now switch on my gyro and not move the heli for at least 10 seconds. Problem solved. Hope that helps.

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09-02-2003 05:09 AM  14 years agoPost 3
MikeW

rrNovice

Southern California

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I have had similar problems where the gyro did not properly initialize.

However, in that case, the pirouette rate is much higher than what Im describing here.

I know the problem is not in the initialization of the gyro though.

??

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09-02-2003 05:40 AM  14 years agoPost 4
bobcnz

rrNovice

Tauranga, New Zealand

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Have you made sure you have no trim set for the rudder?

Bob

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09-02-2003 06:52 AM  14 years agoPost 5
MikeW

rrNovice

Southern California

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no trim on the rudder channel.


Its really slight, but the heading is slowly rotating nose to the left, so counter clockwise.

I dont think it is hunting, I have never seen a HH gyro actually hunt back and forth a great deal.

Can it be hunting in very small oscillations?

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09-02-2003 07:01 AM  14 years agoPost 6
bobcnz

rrNovice

Tauranga, New Zealand

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The only time I have seen that has been if there is a trim set or a offset turning on by mixing etc. Once the 401 is in heading hold it should not drift in normal flight conditions. Even one click of trim will cause that to happen.

Bob

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09-02-2003 07:02 AM  14 years agoPost 7
bobcnz

rrNovice

Tauranga, New Zealand

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You could try setting up another basic model memory just to make sure there is nothing programmed into your current model.

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09-02-2003 07:27 AM  14 years agoPost 8
RobG

rrApprentice

Duncan BC. Canada

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Make sure your tail rotor linkages are smooth and slop free. The bellcrank at the tail case on my Raptor somehow got tight and would bind. It caused loss of heading. I gave it a few squeezes with pliars and gave it a good lube. Everything was fine after that.

Rob

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09-02-2003 08:01 AM  14 years agoPost 9
mvhf

rrApprentice

Antwerp, Belgium

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I had this once too, it turned out is was only in idle up 1, I had different trims for every flight condition.
Do the following test on your tx, put the display on the servos, then go over all the flight conditions withouth touching the rudder, The rudder servo display should stay the same all the time, if so, you are sure it's not the tx or mixing.

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09-02-2003 09:33 AM  14 years agoPost 10
Lars Blaabjerg

rrApprentice

Aarhus, Denmark

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Also make sure the neutral setting is close to the actual hover setting. Do this by making a helper see where the servo arm is when in hover. If this is not the same position as when the helicopter is resting with the gyro in normal mode, you will need to adjust the mechanical linkages.

It goes without saying that this setting should be where the servo horn is perpendicular to the control rod. If it isn't adjust control rod length and servo horn position to suit.

When set up mechanically correct, trim the helicopter in normal mode. Shut down the helicopter and boot it up in HH mode. Do not touch the heli or the radio until the diode in the gyro stops flashing. When it does, it is ready for flight.

Whenever you make a transmitter trim change, you will need to reboot the gyro, otherwise it will interpret this as a rudder command, and turn in HH mode.

/Lars

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09-02-2003 05:29 PM  14 years agoPost 11
MooneyDriver

rrVeteran

Kent, Ohio

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Had same problem with Fury...

It turned out the mounting surface was prone to excessive vibration. I firmed it up and it eliminated the problem.

It seems the best place to mount the sensor is just behind the mainshaft on the Raptor...

The gyro won't hold well if the engine is running rough. Could be a bad engine crankshaft bearing too.

-Neil

Hey man, why does my lipo get bigger every time I charge it?

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HelicopterRadio - Servo - Gyro - Gov - Batt › Trouble with 401/9253
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