Trouble with Gyro/TX set up in JR 9x v2

[Ranger]

Hi Guys

Anyone using a 9x v2? I don't seem to be able to make the Gyro do what it's supposed to :( It stays in AVICS mode and won't switch to norm. I can't find enough info in the TX manual to correct the problem.
Any Ideas?
Ranger

[swatson144]

I'll have a look at the manual you sent and see if I can figure it out when I get caught up.

Steve

[Ranger]

Thanks Steve
Ranger

[swatson144]

From page 27 of the manual...

I'd set it from inh to rudder dual rate. Reason being the 401 needs to boot into AVCS (it is a GY-401 if I remember correctly) . I personally see very little point in attaching the gyro mode to a flight mode.

Set the gain % to 75% with the switch in your position for TX startup. (simply to have all the switches in one direction when turning the TX on instead of needing a check list)

set the other position to 25% this will be for rate mode.

these settings will have gain at 50% of each mode and should be a decent starting point for the maiden

power up the heli the light should be solid on the gyro. Flip the Rudder DR switch and the light should go out. If not check rudder trimms and sub trims as it will flicker when getting a yaw signal.

Being able to switch to rate mode makes setting the preload on the tail very easy.

Steve

[Ranger]

OK Steve,
Pos:0=start up 75% Pos:1= 25%, red light now go's off! is this correct?
when they were set to 50%+50%, the red light stayed on.
What does rate mode mean? and when you say These settings will have gain at 50% of each mode, am I missing something again? if one is 75% and the other at 25%?
Glen

[swatson144]

When you read the gy-401 instructions it assumes you have a Fut TX and you set the gain in AVCS mode which makes the percentages read correctly. 50% avcs and 50% rate read directly.

On other TXs 0-50% is rate mode 51%-100% is HH thus 25%= half max in rate, and 75%= half maximum gain in avcs (HH). It works the same way in my Futaba TX with my non futaba gyros.


When the red light goes off you are in rate mode. Rate mode simply measures how fast the undesired yaw was and takes a guess at how hard to kick it back, there is no feed back. In HH/AVCS the gyro knows what angle it should be at and will persistently maintain that angle. You'll likely see in HH the tail rotor will slowly creep to one extreme or the other. In HH if you move the tail the the pitch on the tailblades will try to compensate more and more until the tail returns. It's easy to check the limits setting and gyro direction this way. Please check the limits so you don't stall your servo and burn it out!

In rate mode you move the tail slow and you'll see a slight change in pitch on the tail rotor, and return to center. Move it fast and you'll see a larger change in pitch.

Steve

[Ranger]

Thanks again Steve,

you always seem to be getting me out of trouble :D I feel some what relieved now, I was getting ready to give the whole game away. hopefully, some of our threads will be helpful to some of the other new people having some of these same problems.
For those of you who don't want to ask the questions, I'll be the guinea pig :D
Glen

[swatson144]

No problem, A heli is pretty complex but every thing about it is pretty simple. If something is being problematic it's likely that the problem hasn't been broken down to it's lowest common denominator.

You still aren't quite done with the tail setup. I assume you have set the limits? I assume a digi servo? If it isn't a 9253 or 9254 you'll want to make sure it is compatible with the 401 in digi mode before you select dg on the gyro. With a digital delay should be 0 if not digi servo about 20% is good to start. Carefully check the servo and gyro direction! it's pretty exciting when you have one the wrong way. Your maiden should not be that exciting.

When you go for the maiden hover you'll likely find the tail holds fine in HH at hover. After a bit of getting comfortable with the heli hovering land it and switch to rate mode and see if you have to hold a bit of rudder stick at a stable hover. Don't worry about when you are compensating just when it is STABLE. adjust the linkages until you are at center stick. A good calm day is nice. (you may have to redo it when the fuz goes on). At this point you'll have a nice mechanically centered tail and the gyro won't be working against the heli trying to constantly correct a persistant yaw.

On gain the old school is to turn the gain up until it wags, then back down a bit. That's pretty hard on the servo and a lot more work than they need to do. You don't need any more gain than what you need to hold the tail in your hardest manuever which will likely be way below where the tail starts to wag on a scale machine. Your tail servo will live a long and happy life like that. If you start doing fast backwards flight it's easy to increase later.


Steve

[Ranger]

Steve,
For the time being I will have to set it up with out digital servo,(Standard) but I expect to get 9253.( another screw up from my incompetent LHS)
For now, the limits have been set.
To the best of my knowledge, directions are OK. Maiden flight is coming up rapidly, fuel has been especially Ordered from Sydney as again my LHS won't carry any!!

[swatson144]

Digi probably won't get you anything on a scale ship and can probably wait until you can't think of anything better to spend on :lol: , or you need to replace the standard.

To the best of my knowledge, directions are OK scary words them! envision the direction of rotation and give L rudder to the TX and ensure the pitch changes to move the tail Right and the Nose left. Then in HH mode move the tail and make sure the pitch changes to move it back.

A hobby shop without fuel? isn't that just a glue store? I can't believe that LHS are too dense to understand that if they don't give you what you want the internet will! Then they complain about decreasing sales after teaching customers to go elsewhere. When I had a store front you couldn't ask me for something I wouldn't have/get for you. It's stupid to chase your customers off to look for a product elsewhere as they might not come back. My LHS really angered me over jerking me around on a 7$ foamy wing. I vowed to buy nothing from them for a year. Now 9-10 helis and setups, 2 radios, and bunches of support gear chargers etc I don't buy nothing from them except sticks n rods my cost per visit went from $$$ to about 20$. They showed no loyalty to me and I reciprocate. Rant over.

Steve

[Ranger]

Been checking! Directions ARE correct.
My LHS is a boat dealer, with side line Hobby! Runs his helies on car fuel!! New LHS is just getting started, and will order anything I want :D and is into electric helies him self. Well, I'll get into final tail set up later in the morning.3.00 am now
If my old LHS is watching HeliTown, He will know who I am and how much I have spent else where!
Glen

[swatson144]

OOOps I forgot to mention when you have the tail adjusted in rate mode It's a good idea to leave it in rate jiggle the rudder to find center fold the tail blades and measure the offset. Folded like that they'll form a V and measure the distance apart at the tips. Write it down in your manual. that way if you ever have to replace the servo linkage or tailboom etc. You just set it up with that offset and you probably won't have to fiddle with the linkages. Saves me a lot of time rebuilding the x400s or change blades from 335mm to 315mm etc.

Steve

[Ranger]

Steve.
If by rate mode, you mean non HH. then my measurement is 34.7mm.
Thanks for the tip, This one, I'll remember :D
Glen

[swatson144]

Yep non hh but you really want to wait until you get it adjusted to hold steady with the rudder stick centered in hover. Then record it and the size type of blades you are using and tail blades specs.

Steve

[Ranger]

No worries, consider it done!
Maiden flight is ever so close, fuel arrives tomorrow. :mrgreen:

[swatson144]

WhoooT!!!

Steve