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HomeAircraftHelicopterRadio - Futaba FASST › GY 401 question
02-08-2010 12:38 AM  8 years agoPost 1
Dagigalo

rrApprentice

Buffalo IA. USA

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Im seting up my first bird tonight and I have a problem with the gyro. Its practicly new. I had it in my Gaui for 5 flights before I sold the bird and kept the gyro. The servo is a used 9253 that seams fine. The problem is that when its powered up the light flashes fast then slows to a slower constant flash. The servo will move with the ruder stick inputs but wont move when I rotate the heli. If I unplug the signal wire from the #5 channle then it will start to work. My instructions is at sombodys house and wont be able to get it untill tuesday. Is this a setup isue or is this going to cost me money?

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02-08-2010 12:43 AM  8 years agoPost 2
Heli_KV

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Ottawa, Canada

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Do you have trim and subtrin set to 0 for rudder channel?

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02-08-2010 12:46 AM  8 years agoPost 3
cwright

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Blossvale New York

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sounds like you are arming the 401 in rate mode. If you are using the gear switch for your remote gain try arming the 401 in the other position.If this is your problem it will solve it. Chuck

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02-08-2010 12:47 AM  8 years agoPost 4
jschenck

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La Vista, NE.

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sounds like you may have the gain set at exactly the mid-point. check your gain setting. Also make sure you do not touch or move the heli or the radio while the 401 is flashing.

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02-08-2010 12:49 AM  8 years agoPost 5
Dagigalo

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Buffalo IA. USA

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Whare should the rate be at when arming?

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02-08-2010 12:52 AM  8 years agoPost 6
Dagigalo

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Buffalo IA. USA

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and the trim and sub trim is cenered

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02-08-2010 12:53 AM  8 years agoPost 7
cwright

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Blossvale New York

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Are you using the gear switch to switch from rate mode to heading hold? That is how I do the 401. I don't use the gyro menu. Just use end points for the gear channel. I usually start with a setting of 50 on the gear channel and then adjust the gain as necessary from there. Chuck

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02-08-2010 12:57 AM  8 years agoPost 8
Dagigalo

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Buffalo IA. USA

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I curently have it on the gyro switch. 38 and 54.

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02-08-2010 01:06 AM  8 years agoPost 9
Harshflyer

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Seattle, Wa.

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Instructions are online. Futaba.com

Still asking why

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02-08-2010 01:10 AM  8 years agoPost 10
Dagigalo

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Buffalo IA. USA

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thanks Ill go read them.

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02-08-2010 01:47 AM  8 years agoPost 11
jschenck

rrProfessor

La Vista, NE.

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Whare should the rate be at when arming?
Depends on the radio, which radio do you have? Need to initialize the 401 in heading hold mode. Probably safe above 54. And yes, no trim, no sub-trim. Check all flight modes for any trim and make sure they are all at zero/center.

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02-08-2010 02:10 AM  8 years agoPost 12
Dagigalo

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Buffalo IA. USA

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Got it guys thanks

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02-08-2010 02:20 AM  8 years agoPost 13
jschenck

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La Vista, NE.

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well, what was it?

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02-08-2010 03:02 AM  8 years agoPost 14
Dagigalo

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Buffalo IA. USA

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I dont know I moved up the two dials delay and travel. I powered it back up and the led stayed on. But if it sits for awhille ill have to turn it off then back on and it works fine. Ill read the instructions as sone as I get it in my hands. Thares somting that I missed,

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02-08-2010 05:28 AM  8 years agoPost 15
dkshema

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Cedar Rapids, IA

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Unless you have a really slow servo, leave the DELAY setting at ZERO. DELAY is only to compensate the tail response to a slow servo.

If you have a slow servo, set DELAY as follows:

Lift off to a safe altitude, and hover. Apply full rudder, then let go of the stick while watching the tail's response. If it over or undershoots the final position, land and adjust the DELAY setting. Repeat until when you let go of the rudder stick, the tail doesn't bounce left or right.

With a modern, fast servo, DELAY should be left at ZERO.

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The TRAVEL LIMIT does NOTHING with regard to heading hold or rate mode operation determination. IT ONLY adjusts the total amount of travel that the gyro will allow the servo to have. The TRAVEL LIMIT is adjusted so that at full rudder deflection, the pitch slider on the TR does not run up against a mechanical stop. If you allow the servo to continue to drive after the mechanics bottom out, you WILL FRY THE SERVO AMPLIFIER.

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The 401 MUST BE INITIALIZED in HEADING HOLD mode. If properly initialized, the red LED will flash at a high rate for the first three seconds after power is applied, then will go ON SOLID. If the LED flashes slowly after initialization, you have NOT initialized the gyro in HH mode.

The red LED provides diagnostic info:

If you are seeing the "intermittent flash", you didn't initialize in HH mode. You'll need to do something about your gain select settings in your transmitter to fix that.

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If the gyro DOES initialize in HH mode (red LED goes solid after the initialization period), and later you find the LED flashing, it means that you have moved the rudder TRIM tab (or your radio has different rudder trims for each flight mode).

NEVER NEVER NEVER NEVER use the rudder trim tab on the TX (or use different rudder trims in each flight mode) AFTER the gyro has been initialized. Doing so will confuse the gyro and it will not work properly.

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If you are setting up a Spektrum or JR 2.4 GHz system, you MUST set the radio to select HH mode and THEN BIND the receiver. This sets the failsafe mode and tells the receiver to come up telling the gyro to go into HH mode while the RX and TX are handshaking to select channels and link with each other. IF you don't bind with the system set to select HH mode, all bets are off on how the 401 will respond at power up.

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Check your radio and make sure that REVolution MIXing is disabled or zeroed out.

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What radio are you using, and what receiver? How do you think you are controlling the gyro gain, and how is the radio really controlling it? If your TX is not set up properly, you may not be using the correct RX channel to control the gyro.

You may not even have the channel that you think is controlling the gyro enabled, especially if this is a new model in your TX memory and you haven't set up the TX correctly yet.

-----
Dave

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

Team Heliproz

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02-08-2010 01:36 PM  8 years agoPost 16
Dagigalo

rrApprentice

Buffalo IA. USA

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Im using the basic DX6i trans. and AR7000 reciever. I have the signal wire pluged in to channle 5 gear channle. Do I need to turn on the channle 5 or select it. Ill look. But I did not first bind the reciever in head holding mode s that may be my problem Ill try that first. The gyro led now goes to solid but when I first power everything up it will slow flash. So I turn it off then back on and it will flash fast then turn solid. I know somthing is not write because when I turn the heli the servo doesnt move much.

Gravity SUCKS!!!!!

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02-08-2010 02:52 PM  8 years agoPost 17
dkshema

rrMaster

Cedar Rapids, IA

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You need to turn on the GYRO sense menu and then select which switch you will use to control the gyro gain -- the flight mode switch or the gyro switch.

In that menu, you'll have a couple of settings for "RATE". Simplisticly speaking, numbers between 50 and 100 will put you in HH mode, numbers between 0 and 50 will put you in rate/normal mode. but the numbers really need to be somewhat bigger than 50, or smaller than 50 to be effective.

This post should help you understand the gyro stuff in your radio much better than you do now. It's written for a DX7, but much of the info that is gyro specific is still directly applicable:

https://rc.runryder.com/p4285239/

The section that talks about the RATE value settings will help you set up your gyro, and the latter portion will help you figure out the gain that you have dialed in.

-----
Dave

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

Team Heliproz

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02-08-2010 05:46 PM  8 years agoPost 18
Dagigalo

rrApprentice

Buffalo IA. USA

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Got it thanks Dkshema. First off it was deffently a the binding problem with the Spektrum equipment. I will use the below link to further adjust it when I get closer to the maiden flight. Thanks again.

Gravity SUCKS!!!!!

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