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Home✈️Aircraft🚁Helicoptere-AlignOther › Why is the tail trim different (Between normal and idle-up)
09-09-2006 11:00 AM  14 years ago
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Crush

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York, PA

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Why is the tail trim different (Between normal and idle-up)
It's been a while since i set up the tail and I probably forgot something simple. I recently rebuilt my TRex 450SE (HDE version)
430L, CC35, HS55 on cyclics, TP2100, 401/9256 on the tail.

I mechanically set up the tail so it hovers in normal mode. The tail stays put just like it should. (no trims, no subtrims, etc) HOwever, when i switch to idle-up, the tail starts to slowly spin. (Like i need to go back and re-adjust the position of the tail servo)
Why would it change, when the idle up is switched. My headspeed doesn't change significantly from normal to idle-up.
"Learning from mistakes gets expensive"
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09-09-2006 12:33 PM  14 years ago
MrMel

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Gotland

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Do your radio perhaps have different gyro gain on different flight modes, If so, you might get out of HH in idle up?
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09-09-2006 01:19 PM  14 years ago
VinceHerman

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Wadsworth, OH

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The tail should behave the same in a hover in either flight mode.

Make sure that revo mix is off.

Make sure that the gyro is properly isolated from frame vibration.
- are you using the foam tape?
- is there any gyro retention device like velcro or zip ties?
- does the case of the gyro touch the frame?
- Are any of the gyro wires pulled tight?
- are there any bundles of wires crammed between the gyro and the frame?

These are all examples that I have seen that have lead to tail drift. In each case, removing the source of the vibration transfer to the gyro corrected the tail drift.
Vince
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09-09-2006 01:26 PM  14 years ago
prototype3a

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Christiansburg,VA

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What radio are you using? It sounds like a problem I encountered receintly seting up a friend's trex.
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09-09-2006 04:02 PM  14 years ago
SSN Pru

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Taxachusetts

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i had that problem with my hde XL when i was using my align gyro. i swapped it out for my futaba gy240 with all of the same radio settings and the problem disappeared.


pru
Stupidity can be cured. Ignorance is for life!
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09-09-2006 05:15 PM  14 years ago
Crush

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York, PA

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I'm using a JR10X radio. I have the gyro mounted on top of the frame using foam tape. (I know this can be dangerous) I just didn't buy the under frame mount yet.
On this rebuild i did take time and neatly secured all the servo wires inside the frame. Perhaps this is what is causing the problem?? But why does it only occur when changing flight modes. I didn't make any changes in the radio.
I'm pretty sure that it is...but, I'll check to make sure the heli is staying in HH mode during the different flight modes.
"Learning from mistakes gets expensive"
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09-09-2006 05:21 PM  14 years ago
rerazor

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Mich.

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It seems if its happening between flight modes that you don't have each flight mode settings (for the gyro) the same. Check to see if the settings in you JR10X (same TX I have) are exactly the same in each flight mode. Also check to see if your trim is set the same in each flight mode (should be centered).

What channel are you using the gyro on your JR10X?
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09-09-2006 05:27 PM  14 years ago
Crush

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York, PA

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I'll go through the radio tonight and double check everything. I'm also betting that it has something to do with the radio. Maybe I unknowingly changed something by accident.
Thanks for the replies. I'll post back after i have a chance to check a few things.
"Learning from mistakes gets expensive"
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09-09-2006 05:58 PM  14 years ago
wcc963

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coconut creek, FL - United States

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I'll go through the radio tonight and double check everything. I'm also betting that it has something to do with the radio. Maybe I unknowingly changed something by accident.
No you dont have to. if my DX6 has this feature im sure your radio does. your radio is a JR and the Spektrum DX6 is also made by JR. my radio remembers different trim settings for idel up and normal. now if you have manuel trim not digital then this wont help, but I think your radio has digital trim. so try this and see if it works. I had the same problem on my rex until i found out that it remembers different trim for each mode. now the transfer is effortless. the only way you can tell i switched is the increase in headspeed.

so give this a try and see if it works.
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09-09-2006 07:20 PM  14 years ago
rerazor

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Mich.

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He could also have his gain setting different for each mode.
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09-09-2006 09:52 PM  14 years ago
SSN Pru

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Taxachusetts

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i have all of my wires wire tied to my frame as well and i do not have any issues with my gy240. i did however discover that my rudder trims were not centered from flight mode to flight mode. you do have the ability to change trim settings between flight modes.


pru
Stupidity can be cured. Ignorance is for life!
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09-10-2006 12:02 AM  14 years ago
Crush

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York, PA

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Well....i got it fixed...I'm not sure why this was happening...but here's what i found.
First...I need to make a correction.. I wasn't using my 10X when this occurred. It was my 8103.

Using the Servo monitor screen, i could see that the rudder channel was experiencing a slight movement to the right when i switched from normal to idle1. I went through everyting and couldn't find what was causing this to happen. Everything was set up the same way for all the different flight modes. Subtrims, travel, gyro gain, pitch curves, throttle curves, expo, etc...

I went to an empty slot in my model memory and input all my T-rex data and started fresh. Now, it is working as it should.
Has anyone else ever had this happen.
"Learning from mistakes gets expensive"
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09-10-2006 01:27 AM  14 years ago
Jaguar

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Palm beach fl.

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trim
make sure your trim is center in both modes
Tempest FAI,Stratus,Fury Extreme,Raptor90se,Rex450se,vigor cs, wow I have a real problem
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09-10-2006 02:29 AM  14 years ago
Crush

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York, PA

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Trim was centered in both modes."Learning from mistakes gets expensive"
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09-10-2006 02:45 PM  14 years ago
SSN Pru

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Taxachusetts

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i have an 8102 and was experiencing the same thing. the servo travel screen showed movement between flight modes. in my case though it was because my subtrims were different between flight modes. there had to have been something in the prgramming of the radio that got fowled up. they are computers and can screw up.
i would give JR technical support a call and ask them about this issue. Im curious as well.

pru
Stupidity can be cured. Ignorance is for life!
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