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HomeAircraftHelicopterBeginners Corner › Gyro response seems weird.
12-10-2004 06:14 AM  13 years agoPost 1
BC Don

rrElite Veteran

Calgary, AB Canada

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I have a VY401 + 9254 that I'm putting on a Raven. I'm currently bench testing it. When I put it into rate mode, it operates as I'd expect. BUT, when in heading hold mode the gyro doesn't seem to return the servo to neutral.

Specifically, if I'm set up, turn everything on in order (heading hold mode). Red light goes solid. Now, if I give input to the rudder with the stick the servo moves in the direction I expect. When I let go of the stick the servo does not centre, it moves back about 30% (meaning that if I were flying I would continue to do a piroette). If I give a bit to rudder stick input and move the gyro as if the heli were moving, the same thing happens. If I move the gyro in the opposite direction it will move the servo back to neutral. But, the servo operates in the correct direction when I don't operate the sticks, just give it a small rotation and causes the servo to respond correctly.

Anyone have any idea whats going on here?

Thanks;

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12-10-2004 06:19 AM  13 years agoPost 2
Saint728

rrProfessor

Honolulu, Hawaii

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The gyro when set in HH it's not meant to go back to neutral. It's meant to stay where you last told it to. The gyro will compensate for the tail turning. You can see this when you lift up the tail and move it. The tail blades will go the opposite way you turn the tail.

Take Care,
Cheers, Patrick

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12-10-2004 06:56 AM  13 years agoPost 3
Helikiller

rrNovice

Kaiserslautern

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completely normal response from the 401. Don't worry, only thing I've found with it is I get a small tail kick every now and then. Nothing to worry about though.

I wish I had something clever to say here.

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12-10-2004 08:06 PM  13 years agoPost 4
BC Don

rrElite Veteran

Calgary, AB Canada

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OK, brought in my Hawk which is working fine and did a comparison. Found out that the servo needed to be reversed . Once I did that it responded the way I thought it would.

Now, when I move the left stick to the right (so moving the nose to the right) and I move the gyro as it if were solidy attached and moving with the Heli, it will return the Servo to Neutral.

The more I work on this the more confused I become it seems.

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12-10-2004 09:07 PM  13 years agoPost 5
Saint728

rrProfessor

Honolulu, Hawaii

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Why don't you find someone at your flying field to have a look at it for you? It would be a whole lot easier and they can show you how it's supposed to be set up without you getting confused or getting it wrong.

Take Care,
Cheers, Patrick

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12-10-2004 09:28 PM  13 years agoPost 6
BarracudaHockey

rrMaster

Jacksonville FL

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Raptortechnique.com has a bunch of gyro stuff on it. Most if it applies to any platform. I figured out how to set my first 401 on my first Nexus off of his page.

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

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12-10-2004 10:38 PM  13 years agoPost 7
BC Don

rrElite Veteran

Calgary, AB Canada

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Regarding going to my field and getting it checked out, I'd likely have to sit there a few months. Although the temp is +2C today, that's the warmest it's been for awhile and we have snow cover, potential for more snow (maybe even rain).

In any case, I've had my hawk checked out and I've flown it OK. I found my issue in this case by observing it a bit closer.

I do plan to get it checked out before I fly it. I may try a bit of a hover with the rotopod first, we'll see. And, I'm still in build mode.

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12-11-2004 12:12 AM  13 years agoPost 8
Wisdom-Seeker

rrVeteran

Danville, CA

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In HH mode, you don't want the servo to return to neutral until you have moved the tail back to the same position you started from. If you have not done so, the control should be moved to a position that should be trying to return the tail to where you started.

In rate mode, all that should happen is for the servo to move from neutral to a position opposing the turn, as long as you're turning. As soon as you stop turning, the servo should return to neutral. The whole point of rate mode is to slow down any unexpected movement of the tail.

--

Wisdom-Seeker
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