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HelicopterRadio - Servo - Gyro - Gov - Batt › GY-401 causing uncontrollable tail
08-07-2007 12:05 PM  10 years agoPost 1
ECO8-Ken

rrNovice

Jackson, Michigan

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I put a new GY-401 on my old ECO-8 a few weeks ago thinking that might solve some of my control issues with the old girl. I have one one a Trex SE, and it works fantastic. I made a couple of just hovering flights, and all seemed well. On my third flight, I had it up hovering at about 2' and did a minor tail correction, and the tail whipped wildly about 90 degrees, and caused a crash. I thought perhaps a gust of wind caught it. Well that crash was about the last straw for the old ECO-8, parts were more than the heli was worth. I just received a Hurricane 550 to replace it.

The Hurricane has the same GY-401, but with a new S9254 servo, I was running an old analog on the old heli. All the linkage appears to move freely, delay is set to 0, and servo travel set to 75%. Rx power is from the stock DX7 battery pack at 4.6v, rudder throws on my Rx set to 50%

Here's the problem I'm having. Upon spooling up the heli the tail seems to hold pretty steady, until I touch the rudder stick for a minor correction (which I would expect not to have to do with heading hold on don't on my T-rex). As soon as I touch the rudder stick in either direction the heli literally spins out on the ground in the direction of rudder input, and won't stop until I throttle down shut off heading hold, and cycle the rudder servo a bit. The same result happens even with heading hold off.

Is my gyro toast!?@!

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08-07-2007 02:30 PM  10 years agoPost 2
fritzthecat

rrKey Veteran

Virginia Beach, VA

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No, it is reversed.

Set up the correct servo direction.
Then set up the gyro. See which way the control rod goes when turning right. Set gyro to HH and turn helicopter nose to left. Control rod should go in the same direction as when turning right.

Fritz


'Send Money, Women and Guns!'

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08-07-2007 02:46 PM  10 years agoPost 3
ECO8-Ken

rrNovice

Jackson, Michigan

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Fritz,

When you say reverse the servo direction are you refering to the reverse on the Tx/Rx, or the one on the gyro. Gyro is currently set as reversed. I am thinking that based on what you are saying, that it would be best to bypass the gyro, and connect the servo direct to the Rx, get the direction right, then add the gyro back into the mix with the reverse switch on the 401 set to norm.

Are the Rx direction, and the gyro direction conflicting and causing the gyro to flip out? I though I remembered reversing the Rx/Tx direction last night with no effect, but I didn't re-initialize the gyro, so it probably didn't help matters any.

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08-07-2007 03:08 PM  10 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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You dont have to do all that.

Give right rudder, the servo should change the pitch of the blades so as to blow the tail to the LEFT. If thats wrong reverse the rudder channel. Most helicopters will pull the rod frontwards.

Next pick up the heli by the head and turn the nose LEFT (counter clockwise looking down) the gyro should give the same input as right stick as in the last step. If it moves opposite reverse the NOR/REV on the gyro.

Problem solved.

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

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08-08-2007 02:38 AM  10 years agoPost 5
ECO8-Ken

rrNovice

Jackson, Michigan

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Thanks all for the help. Switched the gyro over to normal from reverse, and everything started working.

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HelicopterRadio - Servo - Gyro - Gov - Batt › GY-401 causing uncontrollable tail
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