Confused after fine tuning all pitch settings during DIR setup?

[Tristin]

Hi All,

I decided to try some fine running on my 3GX Trex 600 and for some reason I have hit a glitch that I don’t seem get sorted out. I’ve done numerous setups… select a linier curve (PC 2) on my DX7, max 12 degrees either way, collective no problem, with 8 degrees max for aileron as well as elevator, at 100% travel no DR or expo settings, plane liner setup. I do this all during DIR setup as per the manual… I then double check all settings, 0 degrees at centre max 12, Ail and Ele 8 degrees, check that I get no binding at all by maxing all controls using the dumbbells on the tx. This test passes, without any binding (I’m still in FM 2 linier PC) I then get her back to centre stick and complete the rest of the Dir setup. Plain and simple but I have obviously got something wrong as once I re-check max servo movements she the servo horns bind against the servo, something that never happened during the DIR setup. I had not changed any setting on the TX since the DIR, so try again. I do the whole setup and again after DIR complete I have more servo movement for some reason Why? My PC2 is my highest pitch curve on my TX and yes I did double check hat my tx was selected to FM2.

Ill appreciate any help at all.

Once more thanks!

[Tristin]

I think this is what I’m experiencing, could it be that the 3GX operates totally differently in flight compared to on the bench after Dir setup has been completed.. check it out? http://rc.runryder.com/helicopter/t705349p1/ So does this mean she won’t bind in flight? Eish I’m too afraid to even try?

[bad007]

8 deg. cyclic in setup turns into 12 or more in normal initulization.Your not finishing your setup. You need to go threw FM setup and set the limits. I can tell your running either 2.0 or 2.1 by your decription of what happening. Print the instructions using the instrustions link at the top of the software and follow the third collumn leaving everthing default but limits that need to be set.

[Tristin]

Yes I’m running 2.1, but can I set limits through the soft wear and not on the 3GX?

[Tristin]

Bad007 Hi there, again.

I have double checked all settings (as per the Easy Table) and I am 100% convinced that I have all settings completed including all limits. The setting up during LED 2 and LED 4 (8 Deg) . During the DIR setup all operates well no binding at all even at max pitch (12 deg) yet after DIR everything clashes…

Thanks once more...

[bad007]

Originally Posted by Tristin

Yes I’m running 2.1, but can I set limits through the soft wear and not on the 3GX?

Yes. But you sould learn how to set the FM settings so you can adjust the flip and roll rates without a pc at the field. Just print up the instruction and then make a cheat sheet like this.
blinking
once - cyclic speed adjustment
twice - elev travel
three - ailron travel
four - swashplate dampening
five - swashplate bump acceleration

[Tristin]

Hi Bad007, I have tried to set limits but I can’t get her to stop binding. Even if I set the limits to 0% (on max travel for elevator as well as aileron) she still travels way to far… I’ve done numerous setups on the 3GX but never experienced this before…

[bad007]

Originally Posted by Tristin

Hi Bad007, I have tried to set limits but I can’t get her to stop binding. Even if I set the limits to 0% (on max travel for elevator as well as aileron) she still travels way to far… I’ve done numerous setups on the 3GX but never experienced this before…

Then your not going threw dir setup properally or setting the cyclic right.
Make sure DRs are 100 in all flight modes. If you have any in the flight mode your in when runing setup but none in the flight mode your using you'll go beyond you set travel
When you go into setup, make sure you let go of the set button before the leds scroll all the way across and then tip the helli making sure the swash does't move. If it does you held the set button to long and went into throttle range set.
You set the 8 cyclic and complete setup, perform TR setup and then FM aileron and elev limits. When you set your limits it wont travel beyond your settings

[jonbailie]

Some folks take a file and file a bit off of the servo vases, right where it binds up. It shouldn't take much at all, but may be necessary. Are you using the outer servo arm holes for your linkage balls?

I never experienced the problem using the outer holes, but it only just clears. Any slight deviation in dimensions from a number of parts would cause binding.


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[Tristin]

Sorry to push the point but I am doing the setup perfectly correct, believe me I have done this many times, I don’t know why I never had this issue before? How does one prevent over driving the servos like this? There must be a way?

A thought I have, and I probably should have mentioned this earlier, I have tried to use the inside holes on the aluminium servo horns as I feel that the smallest of servo slop from the servos could affect the 3GX and causing some vibrations and possibly affects the flying characteristics on the heli. When checking for binding at full aileron or elevator with pitch inputs at that some time cause binding. So I’ll probably have to revert back to the outer hole on the servo horn. I have however read of some using the inner hole and this created better results.

[bad007]

Originally Posted by Tristin

Sorry to push the point but I am doing the setup perfectly correct, believe me I have done this many times, I don’t know why I never had this issue before? How does one prevent over driving the servos like this? There must be a way?

A thought I have, and I probably should have mentioned this earlier, I have tried to use the inside holes on the aluminium servo horns as I feel that the smallest of servo slop from the servos could affect the 3GX and causing some vibrations and possibly affects the flying characteristics on the heli. When checking for binding at full aileron or elevator with pitch inputs at that some time cause binding. So I’ll probably have to revert back to the outer hole on the servo horn. I have however read of some using the inner hole and this created better results.

Then your not talking about binding on the main shaft center of the swash? Where are you then binding
You need to go out to the second hole out

[Tristin]

Thanks, I did and she now sorted on the swash… Thanks!