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Heli-Max . Scorpion Power System . Ron's RC Helicopters
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Align T-REX Electric Series
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T-REX 450
tail setup 401 trex 450 se
MANNBRAD

Heliman

W.B. MICHIGAN USA

just rebuilt my trex 450 se after my first disaster. I have a 401 for tail controll. My question is this; and ive never set up tail on my own so please bare with me. The only way i can get this to fly decent is by moving the servo on the boom so the tail slider is pretty close to the boom (collective to right). I thought when setting up tail, i should put my dx7 in gear mode and have slider 0 out in between hub and tail holder (in middle) but when i did this, heli would just spin in hh mode. What am i doing wrong? now that i have it flyable, the slider is still way more to the left. my gain is set to about 80. Do i just use gain as like end points so servo doesnt buzz in either direction. Hope this makes sense. if not please ask questions. Thank you for reading this.

09-17-2008 Over year old.
shizack

Key Veteran

Aiken, SC USA

Things to check:
Left rudder should move the servo arm rearward
Right rudder should move the servo arm forward
If these are wrong, reverse the rudder servo in the TX

Hold the heli in hand- CCW twist/nose left should make the servo arm twitch forward
CW twist/nose right should make the servo arm twitch rearward
If these are wrong. change the reversing switch on the gyro

In the TX gain settings on the GER channel, anything over 50 is HH; less is rate mode.

A soul in tension is learning to fly

09-17-2008 Over year old.
HOMEPAGE  
Blade400flyer

Heliman

Montreal Canada

Did the same to me

Hi,
Just to say it did the same thing to me. I have a brand new trex 450 se v2 with 3500g tail servo. When I adjust the tail linkage I put the gyro in normal mode and I have to put the pitch slider away to the left to keep the heli stable nose out. But I think when its adjust very well I put the gyro in HH lock and it works well. When I apply full throttle the nose goes a little bit on the left, is it normal with the GY401? ?
And is it normal to adjust the pitch slider to the left of the slider ??
Thanks
Seb

09-18-2008 Over year old.
gary jp4

Senior Heliman

Nashville, TN, USA

just rebuilt my trex 450 se after my first disaster. I have a 401 for tail controll. My question is this; and ive never set up tail on my own so please bare with me. The only way i can get this to fly decent is by moving the servo on the boom so the tail slider is pretty close to the boom (collective to right). I thought when setting up tail, i should put my dx7 in gear mode and have slider 0 out in between hub and tail holder (in middle) but when i did this, heli would just spin in hh mode. What am i doing wrong? now that i have it flyable, the slider is still way more to the left. my gain is set to about 80. Do i just use gain as like end points so servo doesnt buzz in either direction. Hope this makes sense. if not please ask questions. Thank you for reading this.
Mannbrad, you are not getting into HH mode. You are in rate mode. Like Shizack said the gain controls whether you are in HH or Rate mode. If you have to get the slider far to the left to be trimmed you are in rate mode. In HH the gyro would hold and put the slider where ever it needed to be. When in HH mode the light on the gyro will be on steady with no rudder input. Make sure you don't have any trim set on the radio. Also the gyro needs to initialize in HH mode to work properly. You do set gain with numbers like end points but not to control travel. Gain is an internal setting in the gyro. It is a sensitivity setting telling the gyro how much strength to use in response to a tail movement.

You don't adjust travel or limits on the slider with end points on the radio. Set your end points or limits all the way up or to 100. With the GY401 you adjust the limits with the pot on the gyro. Limits or end points on the TX control the Piro Rate. Turn it up to be faster or lower to be slower.

T-Rex 450 SE V1, 430L 13t, Align 35A ESC, 325 Pro, K&B, JR 6102DX6, GY401, 9650, HS-65MG'S.

09-18-2008 Over year old.
gary jp4

Senior Heliman

Nashville, TN, USA

Blade400flyer wrote
Hi,
Just to say it did the same thing to me. I have a brand new trex 450 se v2 with 3500g tail servo. When I adjust the tail linkage I put the gyro in normal mode and I have to put the pitch slider away to the left to keep the heli stable nose out. But I think when its adjust very well I put the gyro in HH lock and it works well. When I apply full throttle the nose goes a little bit on the left, is it normal with the GY401? ?
And is it normal to adjust the pitch slider to the left of the slider ??
Thanks
Seb
When the nose goes left as you add power this is the torque reaction to the main blades turning and developing lift and resulting drag. When it doesn't work we say the tail doesn't hold. The gyro, servo, and tail blades should work together to make the tail hold, but it can be difficult to get set up right.

It is normal to adjust the pitch slider to the left to get it mechanically trimmed to fly in rate mode. You don't have to do that to get it to fly and hold in HH mode. There are two opinions and schools of thought there. There is nothing wrong with setting up that way and that is what the directions in the gyro call for.

T-Rex 450 SE V1, 430L 13t, Align 35A ESC, 325 Pro, K&B, JR 6102DX6, GY401, 9650, HS-65MG'S.

09-18-2008 Over year old.
gary jp4

Senior Heliman

Nashville, TN, USA

These are some of the factors that affect how well the tail will hold:
  • Head speed. The faster you turn the mains the faster the tail goes and the more authority you have with the trial.
  • Gain. If it doesn't hold gain may be too low. If it is to high the tail will wag.
  • Gyro used. The GY401 is a good gyro and is capable of holding the tail.
  • Servo used. What servo are you using?
  • Freedom from friction, notchiness, and binding on the tail control linkage. Like the slider, slider arm, blade holder bearings, etc. The tail shaft / slider bushing needs lubrication every flight. So does the main shaft / swash.
  • Slop in the linkage.
  • Servo arm length.
  • Tail blades used. Most of the plastic ones are weak, CF's are usually better, the K&B's are good for plastic ones.
  • Even what main blades used to some extent. What main blades are you using?
  • Amount of travel on the slider. For example tail shaft length and adjustment.
  • Then there are modifications like the Chinese weights mods that could come into play.

T-Rex 450 SE V1, 430L 13t, Align 35A ESC, 325 Pro, K&B, JR 6102DX6, GY401, 9650, HS-65MG'S.

09-18-2008 Over year old.
MANNBRAD

Heliman

W.B. MICHIGAN USA

thanks everyone. I guess its just a matter of tinkering with it until you get it right. ( where servo sits on boom, gain controll, limit pot, etc etc. I guess thats why they call it a hobby, cause it takes time away from family. Hell ive been leaving work early just to tinker with this thing. I think its more addictive then cocaine.

09-18-2008 Over year old.
Blade_Master1

Elite Veteran

Canada

I think its more addictive then cocaine.
You got that right cost's about the same too

I blew $500+ on my Sa this month alone

got the good stuff
new servos HS65mg's and a 3154 for the tail
scorpian 55amp ESC
1 air thunder 3s1p 25c 2200 & 1 outrage 3s1p 25c 2200
Hyperion charger
new bearings
set of shafts
new tail gears
new oneway bearing
Radix blades
true blood head dampners

should be good for a couple of crashes

09-18-2008 Over year old.
HOMEPAGE  
dkshema

rrMaster

Cedar Rapids, IA

Don't drive yourself crazy trying to get the heli to hold still while getting the pitch change lever centered on the TR shaft. The 450 wasn't designed to hover without turning with the TR slider centered on the shaft. Most helis aren't.

Get your Trex manual out and read how to set the tail mechanics up.

Then as noted above, if you've built the heli correctly, right rudder will force the TR pushrod to pull the pushrod toward the nose. If it doesn't, reverse the rudder channel at the TX.

Turn the nose of the heli to the LEFT while watching the TR servo arm. It should pull the TR pushrod forward, toward the nose when you turn the nose to the left. If it doesn't, reverse the GYRO direction at the GYRO.

FWIW -- heli in front of you, nose to your right, tail to your left.

TR turns Counter Clockwise. If it turns the other way, your belt is twisted the wrong direction. Fix it.

TR blade on the right of the TR shaft is moving UP, control ball is on TOP, Leading edge of blade on top. If the control ball is on the bottom, fix it. If the blades are on upside down, fix it.

TR blade on the left of the TR shaft is moving DOWN. Control ball is on the bottom, leading edge is on the bottom.

Set the mechanical stuff per your manual. Initialize the gyro in HH mode (ALWAYS, this is NOT an option). Red LED will be ON solid, will blink as you move the stick or the heli, but when the heli is just sitting still, the Red LED is ON when in HH mode.

After initializing in HH mode, switch to Normal/Rate mode, hover. Adjust the TR linkage (or slide the servo on the boom) until the heli will hover without trying to spin either direction. Switch back to HH mode and enjoy.

If using the GEAR channel to control gain, the switch will allow you to select HH operation or Normal operation, you don't get two different HH gains, and you don't get two different Normal gains, you only get the choice of one of each.

Figure out which position of the switch gets you into HH mode. That's where you need to initialize your gyro at each time, and where you'll most likely fly.

The other position of the switch gets you Normal mode. You'll rarely, if ever, use this position, except perhaps when doing that last fine-tuning of the mechanical setup of the tail.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

09-18-2008 Over year old.
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T-REX 450
tail setup 401 trex 450 se
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