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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › a little help with gp780 heading hold radio values
04-28-2010 06:45 PM  8 years agoPost 1
jacattack

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norcal, USA

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After making sure everything works in the right direction my gyro just doesn't seem to initialize in HH mode. According to the manual the light should be red for HH and green for Normal. I have played with all kinds of values in the radio but no luck. i'm using a DX6i. with the green light on the tail will start fine and then as i give it a tail input it just spins and have to get on rudder quickly to hold the tail, had a few hairy moments. thanks

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04-29-2010 04:35 AM  8 years agoPost 2
jacattack

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norcal, USA

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anyone else out there running a gp780?
so far i found is a thread on HF that is similar to what i have been experiencing but the guys thinks his gyro might be faulty, and i hope he's wrong because i don't want to deal with returning and finding a new gyro. and his gyro seem to initialize in HH. http://helifreak.com/showthread.php?p=1862736

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04-29-2010 05:17 AM  8 years agoPost 3
RCHeliJim

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Orem, UT USA

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Try reversing your gain channel, that should change the initial start to heading hold instead of rate mode if it is starting in rate mode. Also, if you have the gain tied to a switch, make sure the switch is in the right place.



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04-29-2010 05:27 AM  8 years agoPost 4
jacattack

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norcal, USA

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Thanks, using a DX6i my gyro switch is two position, from the manual they give you a few recommendation on the gain values (like 50-70) but not tied to any switch position, so i have no clue is "0" is 50 or "1" 50. so my gain values are right now 50-60 but do you think i should switch to 60-50?

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04-29-2010 06:16 AM  8 years agoPost 5
the collective

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Bayside, NY, U.S.A

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jac,

On the DX6i, a value of 50 for the gain is actually No gain. Think of 50 as OFF, then going from 50 to 100 is increasing the gain from OFF to MAX and anything from 50 to 0 is going from OFF to MAX as well. Only difference is 50 to 100 range woul;d put the gyro in head hiold mode, and 50 to 0 settings would put it in rate mode.

Try setting your gyro gain to 70 and 30. Then depending on the gain switch position, you should get the green or red light on startup

Hope that helps

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04-29-2010 07:06 AM  8 years agoPost 6
jacattack

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norcal, USA

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thank, you don't know how much that helps. no wonder my tail was so loose. geez

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04-29-2010 04:29 PM  8 years agoPost 7
jacattack

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norcal, USA

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Ok so after reversing the gyro channel in the TX, and setting my gains at 0:72 and 1:40, the gyro intializes in HH mode and when i flip the switch to 1 it switches to rate mode. now the question is how do i test the gyro on the bench to make sure HH mode is HH mode before i try to fly. so far when it's in HH mode and i move rudder it centers back quickly but in Rate mode it stays at the stick throw and have to move the rudder back to get tail to go back. thanks

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04-29-2010 06:15 PM  8 years agoPost 8
jacattack

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norcal, USA

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Anybody on here uses A DX6i with an align GP780? i'm sure someone has gone through this process before, just need a little here. i just need some starting gain values so i can actually take it off and fine tune it. well, i guess once i figure it out then the next new guy with a dx6i will have to work for it too. lol. oh well back to watching finless bob vids.

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04-29-2010 06:46 PM  8 years agoPost 9
l4rg0

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Northfield, KY - USA

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easy bench test is to power the electronics and jiggle the tail. if it jumps, it is in HH

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04-30-2010 04:48 AM  8 years agoPost 10
jacattack

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norcal, USA

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everything looked fine on the bench but today i took it out and no luck again. heli spools fine, and about 1/2 throttle tail starts to drift and nose spins clockwise and when i tried to hold with rudder tail go crazy and spins out even as i powered down the throttle the tail was still spinning but at least i know my rudder is working in the right direction. for now i'm throwing in the towel until i can get someone at the local field to look at it. i haven't found any DX6i write up on the remote gyro gain setup.

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05-01-2010 05:36 PM  8 years agoPost 11
Delrin

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Upstate New York

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Jac,

Just set up my T-Rex 700 with this exact gyro. Had to learn the setup procedure coming from a GY601.

Your radio settings are correct. You are just confusing Heading Hold (HH) mode and Rate/Normal (R/N) mode. HH mode is the green light after initialization, and red is R/N mode. When you move your rudder stick and the servo does not re-center, this is HH mode. It keeps driving waiting for a correction, which on the bench, never comes.

You can swap the ATV values on the gain channel, or reverse the gain channel. The bottom line is you want the green light at startup, with an initial atv 1:72; 0:30, swapped from what you posted earlier. Confirm the green light for HH in your flight mode.

Hope this helps.

Brian

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05-02-2010 06:19 AM  8 years agoPost 12
the collective

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Bayside, NY, U.S.A

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and about 1/2 throttle tail starts to drift and nose spins clockwise and when i tried to hold with rudder tail go crazy and spins out even as i powered down the throttle the tail was still spinning but at least i know my rudder is working in the right direction.
Okay, if I'm reading you right, the nose goes in the direction you move the stick, but then the heli spins like crazy in the direction you moved it... Easy enough to fix, but let's do a quick check first...

Turn everything on, let the gyro initialize,then move the rudder stick RIGHT... see if the servo pulls the rod forward or pushes it back (most helis it'll pull forward with a RIGHT stick command)

Now that you know which way the servo goes to make the heli turn right, keep an eye on the servo and turn the heli itself to the left and watch the servos response. If it pulls in the same direction as it did when you moved the stick RIGHT, that means it's now trying to go RIGHT in response to the heli turning left. This is what you want to see happen. IF however, the servo goes in the opposite direction than foir a RIGHT stick command in response to turning the heli left, then the gyro is correcting in the wrong direction and will be increasing the turn instead of correcting the turn... It sounds like this is what is happening...

TO reverse the gyro, you do this with the set button on the gyro itself... turn everything on, hold the set button on the gyro til the status LED starts flashing... then press the set button twice to get the THIRD LED (labelled NOR REV) to light up and then move the transmitter stick left or right to change the color of the status LED from red to green (or green to red, whatever it was, you need to change it.

Get out of setup mode and verify that the servo movement in response to turning the heli LEFT on the bench is the same as when you move the stick RIGHT, and you're done.

And one more thing... To tell whether you're in heading hold or rate mode, move the stick and release it. If the servo snaps back to center you're in RATE mode... IF the servo stays over to one side, you're in heading hold mode.

Hope that's useful...

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05-02-2010 03:48 PM  8 years agoPost 13
JeepCJ

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Pennellville NY (Syracuse Heli Group)

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Delrin, you need to change your homepage

Bob

Team Synergy/ Team Scorpion

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