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HomeAircraftHelicopterBeginners Corner › T-Rex 500 Tail Rudder setup
01-24-2012 02:34 AM  6 years agoPost 1
George Colby

rrNovice

Greentown,Pa

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I'm having a tough time understanding the movements of the tail when in head holding with a 401 gyro.

I'm using a Futaba servo 9257. The gyro is a 401.

I know the tail will lock but it seems like I have very little travel and sometimes no travel at all in one direction. Very wierd.

Can someone explain to me the proper setup from start to finish. I have installed the servo arm at 90 degrees and placed the tail in center travel. I have very little if any movement away from the boom but plenty of travel in. I made sure the servo was centered before placing the arm on the servo and that the tail was also centered in it's travel.

This is a first build for me and so far going OK except for tail servo actions. I just like to get some feedback from some experienced people out there.

Thanks,
George

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01-24-2012 03:14 AM  6 years agoPost 2
JetFire

rrKey Veteran

The Golden STATE

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Its been a while since I messed with a 401 so I couldn't break it down into details.. however, for starters make sure you don't have any travel adjustments restrictions, trim, sub-trim.. etc going on in your transmitter for the rudder. It could be as simple as that, but it also sounds like that you didn't program the end-points on your gyro.

In addition, since this is your first build.. make certain the tail responds correctly in reference to rudder movements. You can check this by rotating your rotor head until the tail rotor is completely up and down. If you look down, directly on top of it .. you should see the trailing edge go towards the boom when you move the stick to the left. Vise versa with the Leading-edge when ya move the stick to the right.

This is also a good way to check if the gyro corrects in the proper direction when in AVCS mode. For example.. if ya rotate the nose to the right, then the trailing-edge of the tail rotor should go inward.. indicating the Gyro is attempting to make adjustments to the left. Reverse your rudder in the transmitter if it doesnt. Be advised that both the rudder response to stick, and gyro correction.. are two different things. Dont automatically assume that if one is correct, so is the other... a common mistake. It is important you understand this concept or you will have no control of the tail when you spool it up.

Hope that helped


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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01-24-2012 04:28 AM  6 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

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The 401 isn't difficult to set up...but it does help to have a step-by-step process to follow:

https://rc.runryder.com/p2547232/

9257 servo -- DS switch ON

Which transmitter are you using? The DX6i or the Futaba 7C listed in your profile?

-----

If you built the 500 per the manual, RIGHT rudder command should make the TR servo PULL the TR pushrod forward. If it doesn't, reverse the rudder channel in the transmitter normal/reverse menu.

Then -- pick up the heli, watch the TR servo as you turn the NOSE of the heli to the LEFT. The servo should PULL the TR push rod forward. If it doesn't, reverse the GYRO at the NOR/REV switch on the gyro body.

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Remember, in Heading Hold mode, the servo will not follow the rudder stick, nor will it return to neutral when you let go. It may also stop moving long before your stick reaches the limit.

In NORMAL mode, however, the rudder servo will follow the stick, and it will return to neutral when you let go of the stick.

And don't forget -- you MUST initialize the 401 in HH mode at power on.

-----
Dave

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

Team Heliproz

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01-25-2012 01:06 AM  6 years agoPost 4
George Colby

rrNovice

Greentown,Pa

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I fixed the problem. The servo was not centered due to being in HH mode when I installed the servo arm. Should have been in rate mode doing it.

I'm using the Spectrum 6i but I will be swithing over to The Futaba 7c. I'm hoping that the 7c will have mixing and offset on two servos to correct for drift in a hover. I was told the 6i can't do this?

Let me know what you think

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01-25-2012 02:41 AM  6 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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Offset two servos to correct for drift in a hover. Wonder where THAT came from? Just set the heli up correctly in the first place and go from there.

-----
Dave

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

Team Heliproz

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