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Home✈️Aircraft🚁Helicoptere-AlignOther › GY 401 in a t-rex
10-24-2006 03:48 AM  12 years ago
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KRAR

rrApprentice

Chicago,Illinois

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GY 401 in a t-rex
i have a trex-450 Se with a 401 gyro, great little heli, and lots of fun.... but i cant set the gyro
i can't seem to get the gain set right....
i can get it close to perfect but no matter what i seem to do nothing changes....
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10-24-2006 03:50 AM  12 years ago
caseyjholmes

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Portland, Oregon

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What is it doing wrong?
wagging back and fourth? not holding when you apply pitch? (tail yaws to the right)
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10-24-2006 03:54 AM  12 years ago
KRAR

rrApprentice

Chicago,Illinois

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the gyro just doent seem to hold....
it wags.... when i change the gain it either speeds up or slows down.... but i cant find that perfect spot
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10-24-2006 03:57 AM  12 years ago
caseyjholmes

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Portland, Oregon

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pull the ball link off the tail servo (or z bend) and move the tail servo pushrod back and fourth a few times. Is the tail pitch slider smooth on the tail shaft? it should be very smooth. Make sure when everything is connected, that the tail pitch slider does not hit the tail hub or the tail gear case. Usually when it "wags" you have to lower the gain some, unless there is binding in the tail pitch slider.
also, check to be sure your tail belt isn't missing teeth.
theres more tail setup help on my website..
http://www.holmesrc.com/450setup.html
what servo are you using on the tail?
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10-24-2006 04:03 AM  12 years ago
kcass518

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Port Washington, NY - USA

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Mine had that. We tried everything and eventually replaced the tail unit. Now it's fine. I don't know if that's your problem, but if you can swap tails with someone it might be worth a try. We don't exactly know what in the tail was the problem, but something might not have been machined exactly right.
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10-24-2006 04:04 AM  12 years ago
MikeInMobile

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Mobile, Alabama

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Make sure that you have setup the gyro mechanically in rate mode. This is the biggest issue facing Trex owners since the "one who is not be names" came out with those damned videos
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10-24-2006 04:12 AM  12 years ago
KRAR

rrApprentice

Chicago,Illinois

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that will really help i hope, i'll try it tomorrow and see what happens and get back to you
KR
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10-24-2006 04:23 AM  12 years ago
Powrplay

rrApprentice

USA

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~ What are you running for a rudder servo?
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