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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Spektrum DX7 and GY 401
08-03-2009 04:26 PM  8 years agoPost 1
Shadrack

rrNovice

Winnipeg, Manitoba, Canada

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On my e550 raptor I have the GY 401 and have it set currently to use the gyro sense. I have a bit of a CCW drift that I can't seem to get rid of.

Now I have read a few discussions where they talk about the DX7 dealing with gain on the GY401 a little differently. I guess the numbers don't match straight up?
First, can someone explain the ratio?
I know that >50 is your gain setting for HH and <50 is for rate mode. I also understand how the DX7 sets these up with a 0 and 1 value for both sides with the setting, and then each flight mode is set to 0 or 1.
What I don't like about this is reseting the gyro which involves flipping between rate and hh mode rapidly 3 times.
Not the easiest if you are flipping flight modes.

So I have read that it is a lot easier to use the endpoints on the gear channel and the use the gear switch to flip between the two modes. This way the endpoints configure in the proper ratio.
+ 1-100 is HH and -1-100 is rate mode gain. This would make it easier to do the gyro reset.
Thoughts?

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08-03-2009 04:55 PM  8 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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Read DK's post on the subject. Everything you want to know and more

http://www.runryder.com/t520037p2/?...p=1249314889#RR

Andy
AMA 77227
http://www.jaxrc.com

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08-03-2009 08:20 PM  8 years agoPost 3
Skarn

rrVeteran

Pasadena, MD

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What I don't like about this is reseting the gyro which involves flipping between rate and hh mode rapidly 3 times
That's actually not necessary. All you really need to do is toggle your rudder stick (collective) back and forth 3 times and the servo will re-center.

I love using gyro sense....I personally have no need to ever flip out of HH mode via the gear switch....why would I. And with Gyro Sense I can assign a different gain from normal to HH.

Skarn

It's better to burn out than to fade away...

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08-03-2009 10:18 PM  8 years agoPost 4
Shadrack

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Winnipeg, Manitoba, Canada

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I agree with you. I didn't know about the rudder trick. So after everthing is initialized, go left/right on the rudder 3 times and then leave it centered? I understand it is better to get your heli setup so it hovers in rate mode and then set HH mode. Correct?
Also, knowing the ratios between regular gain and the dx7 was giving me fits.

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08-04-2009 01:20 PM  8 years agoPost 5
Skarn

rrVeteran

Pasadena, MD

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I agree with you. I didn't know about the rudder trick. So after everthing is initialized, go left/right on the rudder 3 times and then leave it centered? I understand it is better to get your heli setup so it hovers in rate mode and then set HH mode. Correct?
Actually, you don't need to do anything after initializing it. Unless you move it and change the attitude/orientation....but if you did do that, yes, flip the rudder back and forth it will recenter.

And as far as setting up for a driftless rate mode hover...the only reason to do that is if you plan on flying in rate mode...which I never do.... Check out the Finless Bob GY-401 setup vid over at helifreak....very simple.

Good luck,
Skarn

It's better to burn out than to fade away...

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08-04-2009 04:07 PM  8 years agoPost 6
BarracudaHockey

rrMaster

Jacksonville FL

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I understand it is better to get your heli setup so it hovers in rate mode and then set HH mode. Correct?
This could easily start a long winded debate, just remember there's more than one way to do something and everyone says their way is the "right" or "better" way.

Skarn is correct though, you can center the servo, center the tail slider, and forget about rate mode.

Andy
AMA 77227
http://www.jaxrc.com

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08-05-2009 02:39 AM  8 years agoPost 7
nemo

rrApprentice

tyler,tx

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what gain settings are you guys running and on what bird with what motor?

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08-05-2009 03:54 AM  8 years agoPost 8
BJames111

rrElite Veteran

San Diego, California

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This could easily start a long winded debate, just remember there's more than one way to do something and everyone says their way is the "right" or "better" way.

Skarn is correct though, you can center the servo, center the tail slider, and forget about rate mode.
The problem I have with this method, is that it does not take into account the servo neutral with some right pitch. While you're learning, it may not be that big of a deal, but when you notice that your piro rate is different from right to left, and that tail performance is not perfect, you WILL go back and set it up in rate mode. Here's my quick set up:
http://www.heliproz.com/HeadingHoldGyro.asp

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08-05-2009 02:02 PM  8 years agoPost 9
Skarn

rrVeteran

Pasadena, MD

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Bjames,

With a 401 and an Align heli (zero pitch at slider center), you won't get consistent piro rates. The 401 can't set individual limits....but yes, I don't want to open this can of worms up again...lets just say I'm far from a beginner and I have never set any of my heli's up for a rate mode drifless hover and my tail is locked in solid.

Skarn

It's better to burn out than to fade away...

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08-05-2009 02:27 PM  8 years agoPost 10
Shadrack

rrNovice

Winnipeg, Manitoba, Canada

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So Skarn,
What do you suggest then that I should do with the small CCW drift that I do have. In this situation should I start by adjusting my gain up? Do I have to reset the heli when I change the gain?
I'm talking about a small adjustment every 15 seconds is what is required now in a hover.

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08-05-2009 05:57 PM  8 years agoPost 11
Skarn

rrVeteran

Pasadena, MD

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In general a lot of people suggest going to a high enough gain to cause wag..then back off a bit.

But personally, I like to go from the opposite spectrum....use as little gain needed to hold the tail...

Your drift can also be caused by vibrations. Are you using the foam tape provided? I use two of them....

Also a picture of your tail could be helpful...

Skarn

It's better to burn out than to fade away...

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08-05-2009 08:24 PM  8 years agoPost 12
BarracudaHockey

rrMaster

Jacksonville FL

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Brian, I'll look you up at IRCHA, we can spend an afternoon hagling about it! You can buy the drinks

Andy
AMA 77227
http://www.jaxrc.com

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09-08-2009 02:48 AM  8 years agoPost 13
Shadrack

rrNovice

Winnipeg, Manitoba, Canada

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Ok. Put in a airtronics 84758 digital servo with a .07 response. Still have a bit of a CCW drift. Minor, but bothersome.

I will go over the link provided to start from scratch setting it up. Also, my 401 was blinking, not a steady light. This was just when I had it sitting on the bench.

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09-08-2009 03:55 PM  8 years agoPost 14
BarracudaHockey

rrMaster

Jacksonville FL

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Its not initializing, you need a solid light.

Either your gain wire is plugged in backwards, not plugged in, or the radio isn't set up right.

OR you're booting the gyro with the gain switch in rate mode.

Any of which will cause your problem

Andy
AMA 77227
http://www.jaxrc.com

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09-09-2009 03:04 AM  8 years agoPost 15
Shadrack

rrNovice

Winnipeg, Manitoba, Canada

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Strange because it does fly, and I do have my gain set properly in the dx7. 60 on 0 and 30 for 1 (rate mode).

Manual says that slow flash is displayed when there are no rudder operation signal being input from the transmitter.

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09-09-2009 06:04 AM  8 years agoPost 16
dkshema

rrMaster

Cedar Rapids, IA

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If you don't have a solid red light on the gyro after you turn the system on and let it initialize, you have NOT intialized the 401 in HH mode WHICH IS REQUIRED if you want the gyro to work.

You MUST initialize the 401 in HH mode, no ifs, ands, or buts. Failure to do so will cause exactly what you're seeing -- slow drift that needs to be corrected every few seconds.

Having the gain set "correctly" means nothing if you fail to initialize the 401 in HH mode.

Manual also says "intermittent flash" is an alarm display --
Alarm display when the power was turned on in the normal gyro mode. For the rudder neutral signal to be read correctly, set the transmitter to the AVCS mode and turn on the gyro power again.

A second time in the manual, under "Flight Adjustment", the same warning is given again:
When the power is turned on in the normal mode, the monitor LED will display an alarm by flashing intermittently. At this time, set the sensitivity switch to the AVCS position and turn on the gyro power again.
If you are flying a Spektrum/JR 2.4 GHz system, set the gain select switch to select HH mode, then REBIND your RX. Failure to do so can cause the gyro to boot up in the wrong mode.

Initialize your gyro correctly, it will behave as it should. Ignore the instructions, all bets are off.

-----
Dave

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

Team Heliproz

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