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HelicopterRadio - Servo - Gyro - Gov - Batt › 401 wont stay lit ???
09-03-2009 02:39 PM  8 years agoPost 1
norsman

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paradise PA

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My 401 has never had any problem,but latley when I power up the light stays red ,after landing my light is flashing

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09-03-2009 02:41 PM  8 years agoPost 2
FlaG8r

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Florida

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I believe it does flash when you give rudder input. If it's flashing without any input theres an issue. Are you switching out of heading hold during flight? Dual rates?

Life is tough, it's tougher if you're stupid

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09-03-2009 03:32 PM  8 years agoPost 3
BarracudaHockey

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Jacksonville FL

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I've seen this when you have the trims different, they should be centered in all flight modes.

Power it up without starting it or with the motor disconnected if its electric.

Flip the flight mode and throttle hold switches, see if any of them make it flash, if it does center up all of the trims.

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

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09-03-2009 03:59 PM  8 years agoPost 4
norsman

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paradise PA

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How can that be,I have a DX7 and lets say every thing is centered then I lift off and need a little foward and maybe a click to the right then I fly off and hit idle up now I need to trim it again as the radio keeps modes seperate.So my question is who can I keep all my trims centered to see if the light will stay lit ???

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09-03-2009 04:04 PM  8 years agoPost 5
BarracudaHockey

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Jacksonville FL

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The first thing to understand is that each flight mode has its own set of trim conditions.

Make sure it is centered on the rudder channel, in each flight mode, you can either look at the tick indicator on the display or just push it left or right till it beeps differently as trim center has a slightly different beep.

It only takes one bump of trim to change the center pulse which will make the gyro blink. Also it will take it as a rudder input and the gyro will appear to drift.

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

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09-03-2009 04:11 PM  8 years agoPost 6
norsman

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paradise PA

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OK ,I get it.Now when I make a rudder trim change in flight and it starts to blink am I stll in HH mode ??? And when I centered all modes it stays lit

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09-03-2009 04:24 PM  8 years agoPost 7
Thumpernator

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Senoia, Georgia, USA

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Now when I make a rudder trim change in flight and it starts to blink am I stll in HH mode ???
Yes, you would still be in HH mode, but, you don't want ANY trim in HH mode.

Check out this Thread. http://runryder.com/helicopter/t537178p1/

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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09-03-2009 04:27 PM  8 years agoPost 8
jamesppp

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carrollton georgia usa

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If you make a rudder trim change after the 401 has initialized, whether flying or not, the light will blink. Try it on the ground and see. A trim change to the gyro is the same as a rudder input.

Plug up and let the gyro initialize with no rudder trim. The light will be solid. Now move the stick and hold it somewhere, the light blinks. Let it return to center and the light is solid. Now add some rudder trim and the light will blink The gyro is still in heading hold mode unless you change the gyro settings ....Trim wont make it go into rate mode

I believe if you leave trim in when you unplug the power, the gyro will see that point as center on reboot...and probably drift

Set the 401 up mechanically in rate mode for no drift, Then you wont have to fiddle with any trim in heading hold mode..leave the trim centered

#:>)*.......................*(<:#

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09-03-2009 04:31 PM  8 years agoPost 9
BarracudaHockey

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Jacksonville FL

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Exactly, you shouldn't have to fool with the rudder trim when its in heading hold mode if your heli and gyro are setup correctly.

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

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09-03-2009 04:39 PM  8 years agoPost 10
norsman

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paradise PA

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Very good,Thanks every body

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09-03-2009 04:48 PM  8 years agoPost 11
FlaG8r

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Florida

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You got a 401 when you should have got a 760!

Life is tough, it's tougher if you're stupid

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09-03-2009 05:56 PM  8 years agoPost 12
dkshema

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Cedar Rapids, IA

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The 401 looks at the rudder signal coming from the receiver during its first three-second power up initialization sequence. It determines by looking at that signal where "neutral" is. Once it figures out where the neutral point is, if you then change the rudder trim, you've taken the gyro's memorized reference point away. It doesn't know anymore what is neutral. You will confuse it, and it won't work very well. And it will start complaining by blinking its red LED at you.

ALL rudder trims in ALL flight modes need to be the same. And don't change them once you've applied power.

-----
Dave

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

Team Heliproz

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09-03-2009 06:08 PM  8 years agoPost 13
norsman

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paradise PA

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Any body useing a DX7 with a 401?? I centered and trimed the Raptor now I have my tail stright at me at 0 trim and red light stays on even in idle up,but my tail got real soft I'm at 65% on both in my gear channel and even when I go up it dont seem to change.I cant even get my tail to wag the pot on the gyro is at75.What sre your numbers ???

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09-03-2009 06:17 PM  8 years agoPost 14
BarracudaHockey

rrMaster

Jacksonville FL

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You need to shorten your servo arm and up the limit pot, then see what it does.

You want that limit at or near 100

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

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09-03-2009 06:22 PM  8 years agoPost 15
norsman

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paradise PA

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Heading out to see

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09-03-2009 06:37 PM  8 years agoPost 16
dkshema

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Cedar Rapids, IA

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Yep, set up the mechanics so that with the travel limit pot set to 100%, you are able to get AT LEAST +/- 45 degrees of servo travel from neutral, without binding the linkage back at the tail slider. It generally means you need to move the linkage ball inwards on the servo to achieve this. Use the travel limit pot to fine tune the endpoints so you don't bind in either extreme of movement.

Once all is set up, initialize in HH mode, switch over to rate mode, and hover. Adjust the linkage to eliminate any left/right yaw tendency. Recheck and adjust if necessary the limit to keep from stalling the servo. Go to HH mode and have fun.

This should allow you to crank up the gain and get much better overall performance out of the 401.

-----
Dave

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

Team Heliproz

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09-03-2009 06:53 PM  8 years agoPost 17
norsman

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paradise PA

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Well,I dont know boysIve done every thing use said and it's working fine travel end points are perfect,reset carbon rod to have 0 trim and red light is good even piro rate is good it just dont stop on a dime and being able to crank it up to 100% with out wagging the tail is strangeSo it flys and it holds even in punch outs just feels soft at the end.At the end of a piroette I get about a 1/4 rotation

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09-03-2009 09:03 PM  8 years agoPost 18
JuanRodriguez

rrProfessor

The Villages, Florida

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Are you positive........

That you are adjusting the ATV channel you have the gain wire (yellow) plugged into ?? And that the yellow wire is plugged in correctly ??? The yellow wire should be plugged into the "signal" pin......

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09-04-2009 12:44 AM  8 years agoPost 19
TonyTypeS

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New Orleans, LA & El Monte, CA

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norsman
What heli are you using the 401 in and what servo? I'm thinking something is sticking on your tail setup. Also are you using 0 delay.

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09-04-2009 12:54 AM  8 years agoPost 20
norsman

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paradise PA

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In my Raptor 50 Titan with a 9253 and what do you mean delay ??

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HelicopterRadio - Servo - Gyro - Gov - Batt › 401 wont stay lit ???
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