RunRyder RC
 5  Topic Subscribe
WATCH
 1 page 1026 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 500 › TG7000 - Strange behavior, but I wouldn't call it drift
01-14-2009 06:58 AM  9 years agoPost 1
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

So I got another flight (hover) on the heli tonight, and I noticed a strange behavior.

When trying to hold a solid hover with no inputs, the heli turned itself to the left, about 1/8th of a turn or so, but then it would sort of correct itself and turn back a bit. All this was slow.

I've seen drift before, and this didn't look like textbook drift.

It did accept any command very readily, so it didn't feel like low gain to me. I currently have the gain at 40 on the travel adjust.

What would you call this, and how would you fix it???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-14-2009 05:42 PM  9 years agoPost 2
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

Anyone - any ideas???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-14-2009 10:03 PM  9 years agoPost 3
TaleGunner

rrElite Veteran

Deer Park WA

My Posts: All  Forum  Topic

try adjusting the gain to start

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-15-2009 05:16 AM  9 years agoPost 4
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

OK - much better tonight but not perfect.

I adjusted the gain to 50, reset the limits, and added a lot of pitch to the tail blades.

In normal mode it was drifting right. Good. So I adjusted the length of the tail rod, and it still drifted right. One more adjust and it was not drifting.

So I switched to HH and it was pretty stable, but it still was a bit wierd. I increased the gain to 60, and it wagged. At 55 it wagged too. Back down to 50 then.

So my question tonight is - what gyro tape does everybody use?

The TG7000 comes with 2 spongy foam pads and a steel plate. The sponge pads are not as stiff as the green Scotch/3M foam pad. So you mount tape/plate/tape/sensor.

I used spongy tape on a Solid-G once on a nitro and it drifted. I went back to the green Scotch/3M foam tape, and the drift went away.

Anyway, just curious what foam tape do you guys use?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 06:58 AM  9 years agoPost 5
caseyjholmes

rrElite Veteran

Portland, Oregon

My Posts: All  Forum  Topic

Using grey with red backing outdoor double sided adhesive tape here on my trex250 with a 401. Got it from Walmart.

This would probably amplify any vibrations over using say the tape included with the 401, but it has a better adhesive quality and I balance out my vibrations as best I can on the bench. The double sided exterior foam tape is half as thick as the stuff that came with the 401.

Be sure to prep the surfaces with alcohol before you tape them.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 07:22 AM  9 years agoPost 6
tacoturbo

rrApprentice

Kauai, Hawaii

My Posts: All  Forum  Topic

Forget the servo tape. I really don't think thats the problem. Did you check your mechanical center? In other words the initial setup in normal mode where the tail pitch slider is centered on the shaft and your rudder servo arm is 90 degrees to the tailboom. I would check that before adjusting anything else. I run 62% HH gain on my Tx (DX6i) and the tail is rock solid. What rudder servo and gyro are you running? I run a 401 and Futaba 9650 with zero issues. However, I don't do hard 3D, only aggressive sport flying which I prefer.

TT

I don't do 3D....no wait. Oh thats right, I can't do 3D!

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 05:13 PM  9 years agoPost 7
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

TG7000 - that is the gyro. The new one from Ace.

I'm running the 9257 tail servo.

The tail servo horn is centered at neutral position, and there is pitch in the tail blades as it should be since I set it up not to drift in Normal mode.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 11:41 PM  9 years agoPost 8
c54fun

rrApprentice

Dallas Texas

My Posts: All  Forum  Topic

Mine did the same thing. I tryed it with the servo on the tail, servo up front, Gyro mounted front and back. Just did not work well.
Also noticed the tail servo was very jittery when moving the rudder side to side. Only with the 7000. Not with the 401. Same tail servo.

Left the servo that came with the gyro on and put on a 401 and everything worked fine. ?????

Edit: This was on a Raptor 90. Not a 500.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 11:52 PM  9 years agoPost 9
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

Also noticed the tail servo was very jittery when moving the rudder side to side.

I noticed this last night too.

WHen I bumped the gain to 60, it rose into a hover nicely, but as soon as I gave it a rudder command, it started wagging. When I lowered the gain to 55, I think that's when I noticed this jittery issue.

I lowered the gain to 50 and it helped.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 01:34 AM  9 years agoPost 10
jschenck

rrProfessor

La Vista, NE.

My Posts: All  Forum  Topic

I just thought of another setting to look at on the TG7000 - which mode do you have the 1520/760 switch in? Perhaps it's in 720 mode and sending the wrong signal to the servo?

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 06:16 AM  9 years agoPost 11
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

OK, tonight we tried several things.

At a gain of 50, it was wagging.

At a gain of 20 and 30, it was vague.

At a gain of 45, it would jitter nasty when commanding a right piro, but not a left piro.

So we left it at 40. But it still felt wierd. It kinda wondered and drifted at 40. Not solid like I expect. Not what I am hoping for. Now this is with pitch in the tail blades due to setting it up in Normal mode with no drift.

So we set the blades to zero pitch when the servo horn is centered. Wow - now in HH it drifted bad. We can not understand why HH can't hold it better than this. Just doesn't make sense to us.

What do you guys think?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 01:28 PM  9 years agoPost 12
Gyronut

rrProfessor

Martinsville In.

My Posts: All  Forum  Topic

Hey Rock

Have you checked the tail slider for binding..??

How bout the blade grip bearings....... Smooth when applying a side load..??

Rick

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 05:03 PM  9 years agoPost 13
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

Yes, mechanically the tail is perfect.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 09:53 PM  9 years agoPost 14
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

My Posts: All  Forum  Topic

I just thought of another setting to look at on the TG7000 - which mode do you have the 1520/760 switch in? Perhaps it's in 720 mode and sending the wrong signal to the servo?
Hmm, I thought I answered this, but don't see it anywhere.

Anyway, the switch is in the 1520 position.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 10:31 PM  9 years agoPost 15
jschenck

rrProfessor

La Vista, NE.

My Posts: All  Forum  Topic

Do you have the 606 servo to try in place of the 9257? I don't think that'd be too big for the 500? I wonder if there is an issue with the servo.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1026 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 500 › TG7000 - Strange behavior, but I wouldn't call it drift
 Print TOPIC  Make Suggestion 

 5  Topic Subscribe

Tuesday, June 19 - 7:29 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online