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T-REX 450 › 401 help please
01-23-2013 08:17 PM  4 years agoPost 1
rhodestimm

rrNovice

delta mo usa

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ok
the ds is on
delay at 0
limit at 60
tail servo ds3400g

raido dx8

i have tried everything and the tail when making movements bounces or when going sideways
gain have tried everything from 30% to 80

any ideas on what else to look for

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01-24-2013 01:21 AM  4 years agoPost 2
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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Limit should be on the gyro's pot should be at least 110.

By limit if you mean 60% on the gyro's pot on it it should be set to 110 to work best and then use the inner hole on a small servo arm around 8mm for your ball to be set for the throw.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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01-24-2013 01:51 AM  4 years agoPost 3
rhodestimm

rrNovice

delta mo usa

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ok it was all the way down at 60
and on the outer hole of the large arm

do i need to set the travel in the raido or leave it at 100

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01-24-2013 02:00 AM  4 years agoPost 4
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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Yes you will have to redo the limits.

But by being in that small of a hole out on a small round wheel 8-10 mm you should be just about right. What I did was slide the servo on the tail boom so you get throw without bottoming out in either dirrection and the tail shouldbe slightly offset in one direction in neutral so as to have some pitch in it for tail to work holding the heli with heading hold turned off and being in a hover.

I think you need to be at least 100% on your Limit or ATV in the radio on the rudder to start then tune up or down for the ammount of rudder stick piro rate you want. Also adjust your gain rate accordingly for good hold.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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01-24-2013 02:31 AM  4 years agoPost 5
BABoyd

rrNovice

Lewisville N.C. USA

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On the DX8 radio your heading hold gain setting should be from around 35% to 45% and your rate gain should be -25% I need to get some more info on your gyro and other settings to figure out your problem.
Thanks Brad

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01-24-2013 02:37 AM  4 years agoPost 6
rhodestimm

rrNovice

delta mo usa

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what u need to know
your wealcome to text or call
573-382-5552

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01-24-2013 07:42 AM  4 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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Rudder endpoints set to 100%.

DS On.

Delay = 0

Travel Limit Pot at 100%.

To figure out how far out to mount the control link ball, place it at a distance from center that allows the servo to travel at least +/- 45 degrees from neutral, without bottoming out the pitch slider at either end of its travel. Get as close as you can to the proper distance. Then use the Travel Limit pot to make sure the pitch slider is not coming up against a hard stop at either end of its travel.

In essence you want the Travel Limit setting as close as you can get to 100%, the servo to travel at least +/- 45 degrees from neutral, and you don't bind up the mechanics at full left or full right rudder.

Set the gain by flying in fast forward flight, increasing the gain until the tail of the heli begins to oscillate. Back off gain to the point where the fast oscillation stops.

Also, make sure the channel that you THINK is controlling the gyro gain is INDEED the channel that is doing so.

The DX8 will default to using channel 5 to control gyro gain and channel 7 to control a governor. This is the opposite of JR systems. If you're adjusting the wrong channel, then the gyro isn't really being controlled properly at all.

Rudder Endpoint settings -- if full rudder causes the heli to spin (yaw) at a rate too fast for your comfort, decrease the rudder endpoint setting from the initial setting of 100%. On the other hand, if full rudder doesn't make it spin fast enough for you, then increase the rudder endpoint numbers towards 150%.

You most likely will end up with different numbers for rudder travel endpoints, if you're trying to achieve equal left and right max yaw rates. With the 401, you most likely won't get equal left and right yaw rates, but can get close.

Make sure your gyro mounting tape is solid and sound, and not falling apart or coming unglued.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-24-2013 04:14 PM  4 years agoPost 8
Waco

rrApprentice

Bernalillo, New Mexico USA

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Dave has got it right in setting up the GY401. I always add the final tweak by hovering in the normal mode and adding sub-trim as required to counter torque. This does not affect slider travel end adjustments previously made. The tail mechanics should be smooth with no binding and the blade hubs move freely. Waco

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T-REX 450 › 401 help please
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