Red flashing light on GY401?

[Cralis]

what channel do you have the remote gain plugged into?
and what are the end points set at on this channel?

Channel 5 EPA = 100%

[moyesboy]

On the hitec tx you have two ways to set up the gyro.
One is using the gyro menu.
The other is to set the gyro menu to inh, then you can use the gear switch to control ch 5 and the end points of ch 5 then set the gyro gain.

In the gyro menu you can set a percentage for gain.
A number like 80% will be HH and a number like 20% - (or maybe it is -80%?). will be rate (normal mode).
yuo get a new setting for gyro gain for each flight mode. when you change the flight mode switch you will see that the gyro gain percentage changes and maybe some numbers refering to flight mode at the top of the screen change.
So to have a choice of HH or rate(normal) mode you need to set normal and flight mode 1 up exactly the same so the pitch and throttle curves are the same but with the different gyro gains. Also you get a new set of trim settings in each flight mode so you need to set them all the same too.
yuo need to switch between HH and normal to set up the linkages etc right and get the gyro working well.

when it comes to setting the gyro gain different numbers on different txs mean different things, so when peole say try 60% that they use on their futaba that wont be the same on your hitec.

I remember on my optic 6 with a gy401 and a digital servo my gain was set to 86% for heading hold.

If you try 80% and when you power up the light stays flashing, then reverse ch5 and try again. Then maybe you will have HH mode. Unless it sees heading hold mode when it switches on it won't move the servo at all.

Once you have the gyro working you shoukd set the delay to zero and set the limit to 100% (asuming you checked the limits of movement on the linkage with the rudder servo plugged into the rx with the rudder channel).

Now with the gyro in HH mode you can fly the heli. If it wags then drop the gain a bit. If it wanders then increase the gain a bit. all the time the rudder trim must be set in the middle. you are never gong to use rudder trim with this gyro.
Now you know it hovers a bit switch to normal mode and see which way it turns as you lift off (cirrect with rudder stick) and adjust the linkage or slide the tail servo on the boom to correct the turn and lift off again until it hovers more or less straight wirth no rudder stick input. also adjust the normal gain until it wags and then back off a bit.
now go back to HH and probably you can add a bit more gain before it wags.
now its optimised. It might wag again in fast forward flight in which case back off the gain slightly.
You see that to set up the gyro you need to hover the heli so it is a lot easier if someone can do that for you if you have never flown a heli before - then it will lift off stright without revolving and without tipping and setting off sideways at high speed!

don't underestimate the amount of space you need. Its also best on a slippy surface then you will see what the heli is trying to do while it skids about on its ping pong ball sticks (hope you have them!). Once you are flying though go over soft ground even though the training gear may dig in its kinder if it goes way wrong!

Now I'm going to say what everyone is thinkng...
This is a really interesting thing to work out on your own, and it'll be really satisfying for you when you eventually get it working. But there are lots of sets of instructions already written on the internet - particurly for your trex at www.trextuning.com and finless bobs stuff at www.helifreak.com.
We're all glad to help but please read through the instructions and use the other resources available as well.

If its still not clear then feel free to post and for sure you will get more answers.

[moyesboy]

Just read your other posts.
Set the gain to 85%, that will make the servo move more for a given movement of the heli (that is what gain means - the ratio of servo movment to heli movement).

Yuo found reversing ch5.

In hh mode the servo does not return to centre.
If you move the heli a little the gyro moves the serfvo to correct and make it point back the same way - but the heli doesn't move so it moves the servo a bit more etc. until the servo reaches the end of travel.

Wehn you move the rudder stick it rotates the sdirection the gyro wants the hlei to point. but the gyro can't make the heli move that way - so it drives the servo to the end and it stays there.

[Cralis]

Moyesboy, it looks like 86% has helped. More movement on the tail when I wag it now. But doesn't seem as much as Finless. Also, when I power up, the heli starts to rotate anti clockwise. Adding right rudder doesn't help. This is with low RPM.. so it's going to spin like a top when I put more power!

Do I reverse the gyro?

[Cralis]

Changinf the 'Dir' on the servo seems to have helped, but it's still spnning a lot.

[jimbob]

Can I suggest something here - It seems that perhaps you dont really understand how it all works, and that to me seems like a bad starting point....

Don't mean to be rude, but did you read the book with the gyro? Its pretty good as to how to set it all up, and trial and error is not a good way of going about it. It'll only end up in a crash, and you won't ever know what happened if you dont understand the system.

[Cralis]

No manual...
But I've found a link for one..

[jimbob]

http://www.futaba-rc.com/manuals/index.html theyre all here!

You can't really even consider setting up a gyro in a heli without reading the manual.....

I know this is a good resource and everything but would you buy a piano and ask someone else to play it for ya?

[gazza]

If you are using the Hi-tec eclipse 7 radio then its best to plug the yellow gain wire into ch7.

This gives you the option to flick between normal and heading hold mode with the CH7 switch just to the right of the screen.

Gain is adjusted with the EPA menu CH 7. ie 0-100%

Much simpler

Also, a detailed 401 setup guide here http://www.swift-tuning.com/gy401-setup.php