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HelicopterRadio - Servo - Gyro - Gov - Batt › Another 401 issue
11-19-2009 11:32 PM  8 years agoPost 1
dbldins

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Danville,Ky.

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It's on a rex450. Initializes and centers. spool up and when head speed is high heli spins rudder opposite and it spins the other direction like not in HH? Solid light says it is?

I'm addicted to flying! Seriously!! I need rehelihab!

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11-19-2009 11:37 PM  8 years agoPost 2
Zaneman007

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Texas - USA

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Do you have the gyro set up in normal or reverse?

Is the gyro upside down, or normal?

Sounds like you have something reversed.

Old Guys Rule!

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11-19-2009 11:42 PM  8 years agoPost 3
Blade_Master1

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Canada

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Sounds like you have something reversed

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11-20-2009 12:25 AM  8 years agoPost 4
dbldins

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Danville,Ky.

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I'm thinkin the same but it's set up exactly like the other and it was fine. Just now using this rex450. frames bent on my regular flier. Gotta be somthing I've missed. Work 2 jobs to fly
I am using an eflite servo! I feel another post comin!

I'm addicted to flying! Seriously!! I need rehelihab!

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11-20-2009 02:05 AM  8 years agoPost 5
Thumpernator

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Senoia, Georgia, USA

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I'm thinkin the same but it's set up exactly like the other and it was fine
What was the "other"?

Anytime you change a gyro or a servo, you should do the complete setup as per your gyro manual. For instance, if you change your servo from a Futaba to a JR, you'll most likely have to change the servo direction and the gyro direction.

So, do the initial setup and then you won't be "thinkin",,,, you'll know.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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11-20-2009 02:23 AM  8 years agoPost 6
Zaneman007

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Texas - USA

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Do a static test on the bench. Take the top rotor blade and lay it so that it is at a 90 degree angle from the blade holder and level lengthwise with the ground pointing away from the heli. Now rotate the heli counter clockwise, the top rotor blade should go clockwise. Now pull the rudder stick to the right(toward the center of the transmitter) the top rotor blade should go clockwise.

You have obviously changed something.

Old Guys Rule!

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11-20-2009 03:19 AM  8 years agoPost 7
Blade_Master1

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Canada

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Agreed with set-up issue
I've done it on 2 nearly identical helis and had to reverse the gyro
if you changed the orientaion of the servo or gyro you'll need to switch something around.

Component oreientation plays a part in your set-up

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11-20-2009 05:48 AM  8 years agoPost 8
dkshema

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Cedar Rapids, IA

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Component orientation plays a part in your set-up
No, actually it doesn't. The ONLY orientation of the gyro that will cause it to be "backwards" is if you had it installed right side up, then flipped it over (or it was installed upside down, and you flipped it right side up). As long as the sensing axis is vertical and parallel to the main rotor shaft (that would be a line through the center of the gyro, going through the top and bottom of the case), you can mount the gyro any way you want. It can be rotated to any position around the vertical sensing axis and will work correctly.

BUT -- not all servos move the same direction for the same rudder stick movement. JR servos move opposite direction from Futaba, for example.

If you switch out servos for another brand, you have a 50-50 chance that the new servo moves in the opposite direction than the one you replaced. Unless you have identical equipment in your helis, you simply can't set them up the same and expect things to operate in the right direction.

The Trex if built correctly requires that the TR servo PULL the TR pushrod forward to turn the nose to the right. Move the rudder stick, make sure the servo pulls the pushrod forward. If it doesn't, reverse the rudder channel at the transmitter reverse menu.

Pick up the heli. Turn its nose to the LEFT while watching the servo arm. The servo must pull the pushrod forward (commanding right turn when you move the nose to the left). If it DOESN'T pulle the pushrod forward, reverse the GYRO by flipping the NOR/REV switch on the gyro to the other position.

Of course, the heli has to be built right. Nose of heli to your right, tail to your left, tail rotor shaft is pointing at you. TR turns CounterClockwise when you turn the head in the correct direction. If it doesn't, your belt is twisted the wrong way. Fix it and make sure you only have a 1/4 turn in the twist.

The TR blade on the right side of the TR shaft is moving UP, leading edge UP, and the control ball is on the top. Fix it if it isn't working as described.

The TR blade on the left is moving DOWN, leading edge DOWN, and the control ball is on the bottom. Fix it if it isn't working as described.

And as described above, right rudder makes the servo PULL the pushrod forward (reverse the rudder channel at the TX reversing menu if it moves the wrong way). Then pick up the heli, turn the nose to the LEFT while watching the TR servo arm. It should pull the pushrod forward. If it doesn't, then change the REV/NOR switch position on the gyro body.

At this point the mechanics are correct and the transmitter AND gyro are set to run things correctly.

If you still have the uncontrollable spinning to the left, then either the front or rear TR drive pulley is slipping on its shaft. That would need to be fixed.

-----

You say it spins as if it weren't in heading hold. That is nonsense, as well. A gyro when properly installed and setup, will NOT allow the heli to spin wildly. HH mode has nothing to do with it. The gyro can be set to operate in RATE (normal) mode and it will not allow the heli to spin. It appears that you don't really understand the meaning of "being in heading hold".

-----
Dave

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

Team Heliproz

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11-20-2009 12:44 PM  8 years agoPost 9
Blade_Master1

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Canada

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No, actually it doesn't.
yes it does !

try it you will see
reverse a boom mounted servo go from right side servo arm to left side
(now you need to reverse rudder channel)
the gyro can be reversed by turning it 180*

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11-20-2009 02:30 PM  8 years agoPost 10
TMoore

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Cookeville, TN

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the gyro can be reversed by turning it 180*
Around which axis are you proposing to turn the gyro? If it is around the rotation axis, I think not.

TM

Delayed Response Operator Not Engaged

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11-20-2009 05:11 PM  8 years agoPost 11
Blade_Master1

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Canada

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180
flip it upside down

but apparently orientation doesn't matter so

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11-20-2009 10:56 PM  8 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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reverse a boom mounted servo go from right side servo arm to left side
Well, duh. I was referring to the orientation of the gyro. My discussion went into great detail to insure that no matter WHAT side the servo pickoff point happens to be (or what direction the servo moves when you first plug it in), that you get correct movement by following a few simple steps.

I even covered the case in which his servo travels in the opposite direction from the "reference" heli he seems to be comparing this one's setup, too.

Bottom line is to make sure the servo AND gyro correct in the proper direction by a few simple bench tests PRIOR to running outside and spinning up the head. And if this is a rebuild from a crash, make sure the two pulleys at either end of the belt are sound and not slipping on the shaft.

Were the OP to follow the guidelines I noted in my post, he will not have the problem he is currently seeing.

-----

As for flipping the 401 upside down to reverse it, I find using the REV/NOR switch much easier and more convenient.

-----
Dave

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

Team Heliproz

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11-22-2009 02:13 AM  8 years agoPost 13
dbldins

rrVeteran

Danville,Ky.

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+1 for dkshema I'm using a diff. servo. Hitec was on the "OTHER" 450. Now it's an eflite eflrs75. Will change and post results but have been trying already to no avail.

I'm addicted to flying! Seriously!! I need rehelihab!

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HelicopterRadio - Servo - Gyro - Gov - Batt › Another 401 issue
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