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wkma7six · 02-12-2012, 01:52 AM

This is the first time I'm setting up the heli and programming the flybarless system and I'm not used to the servo not moving much at all in heading hold mode while I'm rotating the heli by hand. I haven't gotten a chance to do a test flight just yet, just a normal spool up inside the house to make sure everything is moving in the correct directions and everything is, but the minimal movement of the rudder servo concerns me. All the gyro settings and programming appear to be correct and movement direction is normal when in setup mode. I'm used to setting up regular HH gyros like a GY401 where the servo definitely moves when you rotate the heli around in the Z axis or yaw direction. Is this lack of movement normal?

Thanks!

FYI, I can set the gain to 100% and there is no wag on the tail even if I spool it up and I'm holding onto the landing gear. I don't feel much resistance from the tail trying to counteract the movement when I rotate the heli by hand. There are zero vibes coming from the tail boom and the vertical fin has no vibration. It is def. in HH mode and the LED is green when the 3GX system is initialized and armed. Is this just not a good way to test it?

bad007 · 02-12-2012, 07:20 AM

Used to a 401? Well you didn't alter endpoint in theTX did ya? The new Gyros don't work that way.

wkma7six · 02-12-2012, 09:24 AM

No, I did not alter endpoints. Left everything at 100% on the TX and just set the travel limits through the programming of the 3gx unit. I did follow the directions, just curious if this was normal for the limited movement. Everything else appears to work as specified, but the rudder didn't seem to use much movement to correct. I can switch to rate mode below 5% on the gyro gain settings on my DX8 and the LED on the 3gx will switch accordingly between HH and rate mode when fully initialized for flight. It's strange to me that I can set the gain to 100% without wag or strong counteracting movements by the rudder.

Gyro is mounted inverted with the anti torque compensation adjustment set to reverse and the delay is set to 450 class machine.

1004ron · 02-12-2012, 09:43 AM

Sounds like the travel limits in the 3GX are not correctly set in each direction, and as a result you don't see much action on the tail servo even with high HH gain.

You should see the full tail pitch movement when rotating the heli just a few degrees.

wkma7six · 02-12-2012, 09:56 AM

Hmmm.....Yeah, I thought I should see move movement with the gains set at 100%. Something is not right still. The travel on the pitch slider does move from end to end when I move the rudder stick and it remembers the setting and doesn't go buzzing the servos telling me it's gone past the limit settings. I guess I can try it again, but I've done that twice already to make sure it has enough travel limit set.
Thanks for the replies so far.

Al Miessner · 02-12-2012, 01:21 PM

It sounds as if the 3gx doesn't see a rudder gain signal, make sure that rudder gain is ch 5 Futaba / gear on spektrum.. And if using spektrum ensure it ie assigned correctlyin the radio. Maybe a spek user can chime in and elaborate on how to do this. Thanks
Hope this fixes your issue.
Al

1004ron · 02-12-2012, 02:12 PM

Quote:

Originally Posted by tick77

It sounds as if the 3gx doesn't see a rudder gain signal, make sure that rudder gain is ch 5 Futaba / gear on spektrum.. And if using spektrum ensure it ie assigned correctlyin the radio. Maybe a spek user can chime in and elaborate on how to do this. Thanks
Hope this fixes your issue.
Al

Good point - we need to know what radio the OP is using, and if he is using SAT's only with the 3GX or a standard RX.

If I recall correctly, using SAT's only, the gain is sent on AUX2.

1004ron · 02-12-2012, 02:33 PM

Quote:

Originally Posted by wkma7six

It is def. in HH mode and the LED is green when the 3GX system is initialized and armed. Is this just not a good way to test it?

When you flick between a HH and Rate gain, do you see the LED change color? - if not, then it's likely that you don't have the gain channel correctly assigned in your TX.

bad007 · 02-12-2012, 04:09 PM

Quote:

Originally Posted by wkma7six

No, I did not alter endpoints. Left everything at 100% on the TX and just set the travel limits through the programming of the 3gx unit. I did follow the directions, just curious if this was normal for the limited movement. Everything else appears to work as specified, but the rudder didn't seem to use much movement to correct. I can switch to rate mode below 5% on the gyro gain settings on my DX8 and the LED on the 3gx will switch accordingly between HH and rate mode when fully initialized for flight. It's strange to me that I can set the gain to 100% without wag or strong counteracting movements by the rudder.

Gyro is mounted inverted with the anti torque compensation adjustment set to reverse and the delay is set to 450 class machine.

Did the led go red at both limits indicating it was learned?
Did you load the 450 helli class default yet?
Link up and to to settings display tab screen and check the rudder gain while adjusting the gain in the TX, it should change accordingly

wkma7six · 02-12-2012, 08:59 PM

I did have it set on the gyro channel in the radio I stead of the aux2 channel. I found that in another post this morning, and got everything working. Thanks everyone for taking the time out to respond!!

1004ron · 02-12-2012, 09:59 PM

Quote:

Originally Posted by wkma7six

I did have it set on the gyro channel in the radio I stead of the aux2 channel. I found that in another post this morning, and got everything working. Thanks everyone for taking the time out to respond!!

That's what I suspected was wrong, but how did the 3GX LED change status while you didn't have the gain channel correctly assigned in your TX.

Quote:

Originally Posted by wkma7six

I can switch to rate mode below 5% on the gyro gain settings on my DX8 and the LED on the 3gx will switch accordingly between HH and rate mode when fully initialized for flight.

wkma7six · 02-13-2012, 02:57 AM

I am not sure how it would be able to change the LED status. That is why I was at a loss. I thought it was working because the LED would go into rate mode below 5% and this allowed me to think it was getting a signal. I did have the spektrum TX gyro gains set for flight mode and the actual gain channel was set for the wrong output. It's been awhile since I've built a 450 heli and the last one was with a fm/PCM Futaba 9CH. Been awhile. Thanks for the help!

02-12-2012, 01:52 AM	#1 (permalink)
wkma7six Registered Users Join Date: Aug 2006	Heading hold mode normal for servo to move very small amounts? This is the first time I'm setting up the heli and programming the flybarless system and I'm not used to the servo not moving much at all in heading hold mode while I'm rotating the heli by hand. I haven't gotten a chance to do a test flight just yet, just a normal spool up inside the house to make sure everything is moving in the correct directions and everything is, but the minimal movement of the rudder servo concerns me. All the gyro settings and programming appear to be correct and movement direction is normal when in setup mode. I'm used to setting up regular HH gyros like a GY401 where the servo definitely moves when you rotate the heli around in the Z axis or yaw direction. Is this lack of movement normal? Thanks! FYI, I can set the gain to 100% and there is no wag on the tail even if I spool it up and I'm holding onto the landing gear. I don't feel much resistance from the tail trying to counteract the movement when I rotate the heli by hand. There are zero vibes coming from the tail boom and the vertical fin has no vibration. It is def. in HH mode and the LED is green when the 3GX system is initialized and armed. Is this just not a good way to test it?

02-12-2012, 09:43 AM	#4 (permalink)
1004ron Registered Users My HF Map location Join Date: Jul 2010	Sounds like the travel limits in the 3GX are not correctly set in each direction, and as a result you don't see much action on the tail servo even with high HH gain. You should see the full tail pitch movement when rotating the heli just a few degrees. __________________ SAB Goblin 700 - CCHV120 - BEC Pro - AR7200BX - TM1000 / 450 Pro - GT5 - Tarot head / T-Rex 550 V2.1 - CC100 - BEC Pro - AR7200BX - TM1000 /

02-12-2012, 01:21 PM	#6 (permalink)
Al Miessner Registered Users My HF Map location Join Date: Oct 2007	It sounds as if the 3gx doesn't see a rudder gain signal, make sure that rudder gain is ch 5 Futaba / gear on spektrum.. And if using spektrum ensure it ie assigned correctlyin the radio. Maybe a spek user can chime in and elaborate on how to do this. Thanks Hope this fixes your issue. Al __________________ Flying Hard makes it fun (AnimAL) GrandRC Team Pilot \, Team Ninja Pilot

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02-12-2012, 07:20 AM	#2 (permalink)
bad007 Registered Users Join Date: Nov 2009	Used to a 401? Well you didn't alter endpoint in theTX did ya? The new Gyros don't work that way.

02-12-2012, 09:24 AM	#3 (permalink)
wkma7six Registered Users Thread Starter Join Date: Aug 2006	No, I did not alter endpoints. Left everything at 100% on the TX and just set the travel limits through the programming of the 3gx unit. I did follow the directions, just curious if this was normal for the limited movement. Everything else appears to work as specified, but the rudder didn't seem to use much movement to correct. I can switch to rate mode below 5% on the gyro gain settings on my DX8 and the LED on the 3gx will switch accordingly between HH and rate mode when fully initialized for flight. It's strange to me that I can set the gain to 100% without wag or strong counteracting movements by the rudder. Gyro is mounted inverted with the anti torque compensation adjustment set to reverse and the delay is set to 450 class machine.

02-12-2012, 09:56 AM	#5 (permalink)
wkma7six Registered Users Thread Starter Join Date: Aug 2006	Hmmm.....Yeah, I thought I should see move movement with the gains set at 100%. Something is not right still. The travel on the pitch slider does move from end to end when I move the rudder stick and it remembers the setting and doesn't go buzzing the servos telling me it's gone past the limit settings. I guess I can try it again, but I've done that twice already to make sure it has enough travel limit set. Thanks for the replies so far.

02-12-2012, 08:59 PM	#10 (permalink)
wkma7six Registered Users Thread Starter Join Date: Aug 2006	I did have it set on the gyro channel in the radio I stead of the aux2 channel. I found that in another post this morning, and got everything working. Thanks everyone for taking the time out to respond!!

02-13-2012, 02:57 AM	#12 (permalink)
wkma7six Registered Users Thread Starter Join Date: Aug 2006	I am not sure how it would be able to change the LED status. That is why I was at a loss. I thought it was working because the LED would go into rate mode below 5% and this allowed me to think it was getting a signal. I did have the spektrum TX gyro gains set for flight mode and the actual gain channel was set for the wrong output. It's been awhile since I've built a 450 heli and the last one was with a fm/PCM Futaba 9CH. Been awhile. Thanks for the help!

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