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HelicopterMain Discussion › Gy401 and s9254
09-16-2007 10:07 PM  10 years agoPost 1
computerdude

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NC

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I went to fly my electric trex 600 and my tail would sporadically wag. I would bring it to a hover and if I gave any rudder input it would wag when I stopped giving it input and then stop after a few seconds.

It was flying just fine before and I didn't change anything. I played around with gain and it did the same thing. I did also notice that when I cut the helicopter on, the tail servo would twitch a tiny bit without me even touching the sticks. That makes me think that maybe I just need to replace the servo. Any ideas??

Thx in advance.

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09-17-2007 01:46 AM  10 years agoPost 2
tlankford01

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Amarillo, TX 79110

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What voltage are you running on the tail servo. The reason I ask this is that I just learned that a tail servo has to be stepped down to 5 volts. I did not realize that my mechanic had already done this to my 600. So it is possible to have to replace the servo if you have been running over 5 volts to it.

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09-17-2007 01:50 AM  10 years agoPost 3
porkchop101

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springhill florida

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Make sure your gyro is mounted securely. A little movement in the gyro will cause your tail to wag.

What goes up must come down!!!!

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09-17-2007 02:02 AM  10 years agoPost 4
nigel1

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Toronto, Canada

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Tail Wag with 401

Seen this many times with my 401's...your gain is too high. Just drop it a few notches try again and keep going until you loose the wag!Good luck.

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09-17-2007 02:47 AM  10 years agoPost 5
computerdude

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Thank you very much for the voltage suggestion which I have been running 5.8v to it so you are more than likely right. I will buy a voltage regulator and probably have to buy another servo because I have probably fried mine. Will post back when I get one.

Thanks to all for suggestions.

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09-17-2007 09:52 AM  10 years agoPost 6
tlankford01

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Amarillo, TX 79110

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I have two heli's that I run unregulated but I am using a JR 8700g. This seems to be a more durable servo than the Futaba servo. You might consider the switch since you are purchasing a new servo anyways. Also the align 5V step down for the tail servo is only like $5.99 and can be set between the gyro and the tail servo.

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09-17-2007 01:22 PM  10 years agoPost 7
computerdude

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I will most definiently consider the JR 8700g as long as I find that it will work with the gy401 which I am sure it will. I have seen the specs and it is faster and more torque which is always kewl What gyro are you running tlankford01?

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09-17-2007 02:53 PM  10 years agoPost 8
tlankford01

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Amarillo, TX 79110

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I have used the 401 with the 8700g on my predator and 3400g on my 450 before I sold it. I have two friends that use the 3400g with there 450's and I am running a 501 in my predator now with the 8700g. just set your gyro on high rate(for digital servo) and let her go.

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09-17-2007 04:53 PM  10 years agoPost 9
computerdude

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NC

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Thanks alot for the info. I will order one and see if I can find a voltage regulator. I will post back when I test out the new configuration.

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09-17-2007 05:11 PM  10 years agoPost 10
BarracudaHockey

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Jacksonville FL

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You dont need a regulator just get an Align tail step down, its like 4 bucks.

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

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09-17-2007 07:34 PM  10 years agoPost 11
cessna151

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Missouri... Originally Indiana

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when I cut the helicopter on, the tail servo would twitch a tiny bit without me even touching the sticks.
Assuming cut=turn, that is normal. The gyro takes 3-4 seconds to initialize, after that the servo automatically goes to center without any inputs.

Also when you first turn it on, the gyro must remain perfectly still and don't move the sticks until it initializes and the red light comes on. Otherwise the gyro won't work properly.
I have been running 5.8v
What is your setup? How do you get 5.8v?

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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09-18-2007 05:55 PM  10 years agoPost 12
computerdude

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NC

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I am using the stock BEC which outputs about 5.8DC. I am currently looking for a step down and I found step down to a 5.4 nearby. Is that sufficient enough or do I need to get the 5.1?

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09-18-2007 06:38 PM  10 years agoPost 13
BarracudaHockey

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Jacksonville FL

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5.4 is fine, thats the voltage of a charged 4 cell pack.

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

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09-18-2007 06:46 PM  10 years agoPost 14
computerdude

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NC

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I am using the stock 2 cell 7.4 lipo that comes with the 600 kit

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09-18-2007 06:50 PM  10 years agoPost 15
cessna151

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Missouri... Originally Indiana

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A BEC output of 5.8v will not hurt the servo. I don't think you need a step down.

Tail wag is nearly always a gain problem. The best way to prove this is to take any extra servo you have laying around and replace the 9254 with it and test fly. If it still wags then put the 9254 back on and adjust the gain.

I know you already said you adjusted the gain but assuming you are using the remote gain, it can be confusing and not everyone fully understands how it works and how to properly adjust it. Could this be the case for you? No shame in admitting so, it will help us help you.

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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09-18-2007 11:16 PM  10 years agoPost 16
tlankford01

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Amarillo, TX 79110

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COmputerdude I thought of one more thing. I had a jr g500t on my predator for a while and I could not get the wag out. Three seperate people looked at it and tried. Well I looked at the servo frame switch. You have a toggle switch on the 401 also that is for regular analg servos and digital servos. Mine was set to analog and when I switch it to digital it worked like a dream. That could possibly be your problem. Let me know if that was it. On your 401 there is a switch for normal and reverse and a switch for normal or DS. Make sure the switch is set to DS.

5.4 is fine but an Align step down is $4-$6. well worth it for the life of your servo. 5.8 is getting to close to 6v in my opinion.

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09-18-2007 11:29 PM  10 years agoPost 17
eyeflyhelis

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charlotte nc

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i run/ran that setup on my heli with a 7.4 lipo stepped down to 6v

(5.8ish) and never once rand a step down for the gyro or servo. i think its gain or something loose

only you have the power to make no difference!

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09-18-2007 11:59 PM  10 years agoPost 18
tlankford01

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Amarillo, TX 79110

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the gyro itself does not need the step down but if you read the specs on tail servos they are all rated at 4.8 while other servos are rated for either 4.8 or 6v. The new JR 8317 can actually run straight off of a 7.4 lipo without step down. Tail servos are rated lower for wear purposes. Obviously many people are running straight setups but you are going to find your servo wearing faster. I was not a believer myself until about two weeks ago. I run straight 4.8 packs on my futura with 8700g but my predator has a generator that regulates everything to 5.4V. This is less than 5.8 and closer to 5V. My 600 however has a stepdown before the gyro but it can be set after the gyro. The gyro is not what matters it is the servo that has to be regulated close to 5V because they are not rated higher.

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09-19-2007 01:17 AM  10 years agoPost 19
computerdude

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NC

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my gy401 switches are in the correct position. DS and I have it reversed which is right for my setup. Looks like everyone is out of just the align regulator unless I get a BEC with it too which would be bout 20$ total. I might just do that.

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09-19-2007 05:13 PM  10 years agoPost 20
cessna151

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Missouri... Originally Indiana

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So am i on ignore now? Spending money isn't always gonna fix things. If you have money just burning holes in your pockets then go ahead, but i would try and find the problem first.
i think its gain or something loose
thank you

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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