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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › GY401
05-24-2007 01:17 AM  13 years ago
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irush

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Greensboro, NC

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GY401
Quick question,
Is there a forward and aft orientation for the 401 gyro. Got mine set up and I can't control it. It is hooked up to a JR6102.
stupid gravity......
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05-24-2007 01:19 AM  13 years ago
Wingman77

rrProfessor

Pulaski Tennessee

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no, it can be turned any way you wand as long as it is either face up or face down.
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05-24-2007 01:36 AM  13 years ago
irush

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Greensboro, NC

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thanks, back to the drawing board.stupid gravity......
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05-24-2007 07:17 AM  13 years ago
MolokaiBoy

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Lahaina, Maui,Hawaii USA

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could it be in reverse?Les
Maui RC Modeler's, Big Island RC Helis, http://www.facebook.com/mauirc
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05-24-2007 08:17 AM  13 years ago
RadioFlyerMk

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Trenton, Ohio,

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I am going to post some tips here for you. I cannot and will not take credit for this, but it sure helped me alot. I will also say if you need any help, I would seek advice from dkshema. He really knows his stuff and does an excellent job at typing out directions so that even I can understand. So I wanted to pass this on to someone else in need. I copied and pasted his post onto my PC for future reference and even have a copy in my work shop. (Thanks DK, you Da man)
So this is from DK, hope it helps you out. You can also do a search on RR for the 401 setup. Maybe this will do it for you though. What I would do, is start from the beginning, and follow his directions step by step and you will not go wrong. Sounds like you may have the rudd reversed, and this post will not go into detail on how to fix that, but read this and if your answers arent here, then do a search on RR and you will fin furter posts from DK that spells out exactly how to fix it. if you have trouble, Pm me and I will see if I can find those for you. Good luck, Mike

GY 401 Setup.

Number 1. You MUST apply power to the 401 with it set to Heading Hold mode. If you don't do this, all bets are off on whether or not the gyro will work. The red LED will blink rapidly at power on, then go on solid if you've successfully initialized in AVCS/HH mode. If you don't get a solid red LED on your gyro after initialization, you're in the WRONG mode. Fix the gain setting to select HH mode and try again.

Number 2. Make sure that you've set the mechanical aspects of the tail rotor system up first. Servo centered at neutral, arm perpendicular to the tail boom, and to the push rod. Get the bellcrank at the rear set up per your assembly manual, too. There should be no binding or stiff spots in the mechanics. Fix it before you go any further.

Number 3. Max out your rudder travel endpoints in the TX. This will set the pirouette rate to maximum. If you find that piro rate too hot to handle later on, decrease the endpoint settings as you trim the heli for flight.

Number 4. Set the TRAVEL LIMIT pot so that the servo and tail rotor mechanics don't bind or run into a mechanical stop at either end of the rudder travel input.

Number 5. I assume you have the transmitter rudder direction and the gyro normal/reverse direction properly set to work in the correct direction. If not, fix it BEFORE you fly.

Number 6. Turn the DELAY pot to 0 unless you are using a slow analog servo.

Number 7. If you're using a digital servo such as the 9254, turn the DS switch ON, otherwise, turn it OFF.

Number 8. Make sure ALL RUDDER neutral and sub trim settings are dialed out to ZERO in ALL flight modes. This is easily overlooked, but a must. NEVER NEVER NEVER touch the rudder trim tab on the TX after you've initialized the gyro in HH mode. You will confuse the gyro and the result won't be pretty.

Number 9. When using the heading hold mode, REVolution and ACCeleration mixing must be disabled in your transmitter.

Number 10. Assuming you have the mechanics set up correctly, the travel limit adjust pot is set to prevent mechanical binding at the endpoints, that you are initializing in HH/AVCS mode, you should be ready to actually fine tune the mechanics. Turn on the transmitter, the receiver, and let the gyro initialize in HH mode. Switch the gyro to NORMAL mode, then bring your heli to a hover. Adjust the tail rotor pushrod until you can hold a hover without any stick correction without the heli trying to rotate left or right. Land. Switch back to HH/AVCS mode. Go fly.

Number 11. Adjust your gain for HH/AVCS and Normal/Rate mode based on the flying characteristics of the heli.

Number 12. If you had to do some mechanical adjusting of the TR stuff when in Normal mode, it's a good idea to recheck your travel limit adjustment to insure you don't have binding at either extreme. Go fly, you're done.

Here is a link to an old post that also may help

http://runryder.com/t337293p1/
-----------------------
"I'd rather hover a Heli......than fly a plane"
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05-24-2007 11:10 AM  13 years ago
irush

rrApprentice

Greensboro, NC

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Thank you. This has been very helpful. I realize now that i have setting up travel wrong. I set the travel limits on the gyro to 75% and then used the transmitter to keep the servo from binding. Also wasn't doing this in HH mode.stupid gravity......
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05-24-2007 02:48 PM  13 years ago
irush

rrApprentice

Greensboro, NC

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started work on the travels for the gyro. Came accross another problem. With gyro limit all the way down, I still hit the stop and the servo binds. Is the mechanical neutral not correct or is it something else?stupid gravity......
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05-24-2007 03:47 PM  13 years ago
darrens

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United Kingdom

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You could be connecting to the servo too far out on the horn. I think from memory the ideal is about 6mm from the centre of the servo, but do some searching on here to check that, or hopefully someone will post to confirm.He who dies with the most toys is the winner!
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05-24-2007 05:58 PM  13 years ago
JEEPWORLD2002

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BLUEBELL PA USA

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if u tring to use with guro sens screen
set o-75 1-0(49 or lower) this is for the gyro sens screen then use the rudder dual rate switch to select between modes DR and HH raptortenique.com has the best directions to set up the gy401 gyro go there.for full directions

you should not use epa or trv adjs only change limit on gyro turn pot if it is to much still then decrease servo wheel size but dont go to samall or u will loose speed what servo are u using 9650 ?

to set mech neut turn on tx then rx in the hh mode u will know by if the led is lit solid then switch to DR mode and set mech in dr mode it always sits at neut untill u make inputs then let go and it cntrs bach to neut.
Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
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05-24-2007 11:44 PM  13 years ago
irush

rrApprentice

Greensboro, NC

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yeah using the digital futaba servo. I bought it used from a fella that had the same transmitter and gyro. He flew it and so did I, then he removed the gyro, trans and receiver. I changed nothing mechanical on the helicopter sense then. All I was trying to do was replace the missing electronic components. I have no paperwork for the trex, so that is a bit of an obstacle as well. This stuff is pretty new to me still.stupid gravity......
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05-25-2007 04:55 AM  13 years ago
JEEPWORLD2002

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BLUEBELL PA USA

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WORST CASE SENARIO
i will b at the MHA fun fly in MD next weekend if u cant figure it out come on up, ill be at the QWW tent
Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
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