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HelicopterRadio - Servo - Gyro - Gov - Batt › setup 401 gyro - having problems
12-29-2008 12:55 AM  8 years agoPost 1
raynman

rrKey Veteran

Lyall Bay - Wgtn -​N.Z

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I have installed the 401 gyro to the manual - My transmitter is a 9chp Futaba and have also setup my rjx 50 to the manual - electrics run well, Ive set up 401 gyro so I can link between normal mode or AVCS - My problem being is when I spoil up the heli just under 1/2 stick, the tail is holding just? and before hover mode the tail lets go and just spins around 360 with the training wheels! If this problem sounds familiar - Please chuck us a reply!

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12-29-2008 12:57 AM  8 years agoPost 2
jetfixrguy

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Spring Hill, FL

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Well from what I gathered when I read your post, I think you should reverse the rudder channel in your TX first and see if the spinning goes away.

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12-29-2008 01:41 AM  8 years agoPost 3
kraffty

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princess anne md.usa

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yup...the gyro is backwards..either in the radio or on the gyro.

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12-29-2008 01:43 AM  8 years agoPost 4
kraffty

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princess anne md.usa

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or possibly the tail blades are on backwards...spinning the wrong direction...saw that once too.

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12-29-2008 02:26 AM  8 years agoPost 5
jsenicka

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Eagle River, WI

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Rudder channel wrong in the TX means it spins opposite what you command. Which has zero to do with the heli pirouetting by itself on lift off. If that is happening, it is the gyro that needs to be reversed.
Before you do anything, fire it up on the bench in HH mode (AVCS). Grab the tail and swing it clockwise. The blades should move opposite to try to swing it back.

Jim Senicka
Team Manager, GrandRC Flight Team

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12-29-2008 02:32 AM  8 years agoPost 6
jsenicka

rrProfessor

Eagle River, WI

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A bit more.

Assuming the RJX has the blades on the right side of the boom?
Left rudder command should push the leading edge of the blades away from the boom, to pull the tail away from the fin. Right rudder should bring LE of blades to the boom, and swing the boom toward the fin. If this is backwards, reverse your rudder servo direction in the transmitter.

To test the gyro response direction, boot up in HH mode. Shove the boom hard toward the fin. The blades should rapidly move to full travel with leading edge away from the boom (same as above with left rudder). If the response dos not move the blades to counter the direction you moved the tail, your gyro response direction is wrong, and needs to be swapped on the 401 switch.

Bottom line is you cannot reverse gyro response to uncommanded rotation on the transmitter, and you cannot reverse blade direction on rudder stick input on the gyro.

Jim Senicka
Team Manager, GrandRC Flight Team

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12-29-2008 04:38 AM  8 years agoPost 7
David Blain

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Mt. Dora, Florida​(USA)

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raynman--
Click on the link below, it is still a step by step method of setting up the GY401 with the Futaba 9C radio.
I have used these setups and if followed step by step, you will find the GY401 will do all you ask or need of it....

http://www.raptortechnique.com/gy401-futaba9c.htm

Good luck and LET US KNOW here on RR how you make out....

Pull-n-Pitch

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12-29-2008 04:47 AM  8 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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I just took a look at an RJX Xtreme 50 manual on line.

The heli is pretty standard fare. MR turns CW when viewed from above, and with the heli sitting on the bench with the nose to your right, tail to your left, the tail rotor shaft is pointing at you. The TR turns counter clockwise and uses leading edge control of the TR blades. The tail rotor bellcrank is conventional, as is the pitch slider.

The TR blade on the right side of the TR shaft is moving UP, its leading edge is UP, and the control ball is on TOP.

The TR blade on the left side of the TR shaft is moving down, the leading edge is down, the control ball is on bottom.

If you've built your heli correctly, when you command RIGHT rudder, the TR servo MUST pull the tail rotor pushrod FORWARD. If it doesn't, you need to REVERSE the RUDDER channel in your TX.

Next, pick up the heli and watch the TR pushrod as you TURN the NOSE of the HELI to the LEFT. The GYRO needs to tell the TR servo to PULL the pushrod forward. If it doesn't, you need to change the position of the REV/NOR switch on the 401 body.

Both the RUDDER channel in the TX AND the gyro direction need to be set correctly or you will have an uncontrollable spin of the heli when it gets light.

-----
Dave

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

Team Heliproz

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12-29-2008 11:00 PM  8 years agoPost 9
raynman

rrKey Veteran

Lyall Bay - Wgtn -​N.Z

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All you guys are the best - I took everything you all said and fixed the problem!!
Mechanicaly and setup was fine, it was my GYRO DIRECTION which needed to be changed!
Once this happed I was away laughing - I burned 5 litres with my gyro setup on my rjx50 - It took me a little getting use to flying around without playing with the rudder - I always had a habbit of correcting the tail everytime it drifted - I'm guessing it was a bad setup?

Thank you to everyone.

Raynman.

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HelicopterRadio - Servo - Gyro - Gov - Batt › setup 401 gyro - having problems
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