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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Loose tail on Blade 450x with 3GX v5?
12-22-2014 10:33 PM  5 years ago
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meowguy

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Loose tail on Blade 450x with 3GX v5?
I am running a 3GX v5 on my Blade 450x. Everything works very well except the tail. The tail is just extremely loose. It's like the gyro is not locking it in at all and any input from the rudder stick just cause a lot more movement than I desire. I have to constantly think about flying the tail. I am running my gain at 70% in all flight modes. Adjusting the gain does not really make any difference. I have had it up to 90 and as low as 40% and this problem still plagues an otherwise nice helicopter. The tail is not "hunting" it is just sort of very slowly wagging from right to left.

Mechanically everything seems in order, and the 3GX is set up properly I believe.

Any help would be appreciated.
"Sweet dreams and flying machines in pieces on the ground." J. Taylor
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12-22-2014 11:30 PM  5 years ago
dkshema

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What are you using for receivers, and what are you using for a transmitter?

If you are using a Spektrum transmitter and satellite receivers into the 3GX, you MUST change your Spektrum transmitter to operate gyro gain using Channel 7.

If you have a Spektrum TX, its gyro control is set to default using Channel 5. If you are using satellites as the receivers for your 3GX, you are REQUIRED to use Channel 7 for gain control. No ifs, ands, or buts. You may NOT be controlling gain at all, unless you fix this.

Also, set the gyro in RATE/NORMAL mode. Hover, adjust the tail rotor linkage until the heli does NOT yaw left OR rignt. Land. Re-set your travel limits to keep from stalling the tail rotor servo at a hard stop.

Go back to Heading Hold, and enjoy.
-----
Dave

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

Team Heliproz
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12-23-2014 07:59 AM  5 years ago
meowguy

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If you have a Spektrum TX, its gyro control is set to default using Channel 5. If you are using satellites as the receivers for your 3GX, you are REQUIRED to use Channel 7 for gain control. No ifs, ands, or buts. You may NOT be controlling gain at all, unless you fix this.
I can confirm that I am using Chan. 7 for Gyro gain on my DX9. When I reduce the gain to below zero, I get the RED light on the 3GX indicating rate mode. I always setup my tails mechanically with 15 degrees of right rudder in rate mode with my servo arm and linkages at 90 degrees. This has never been a problem and I honestly don't think that is the problem now.

I have gotten really good at flying the tail on this bird, but I would like to be able to concentrate on the nose for a change.
"Sweet dreams and flying machines in pieces on the ground." J. Taylor
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12-23-2014 06:51 PM  5 years ago
wc_wickedclown (RIP)

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what tail servo ?Insha Allah made in america
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12-23-2014 07:21 PM  5 years ago
meowguy

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Stock blade DS76t with new gears."Sweet dreams and flying machines in pieces on the ground." J. Taylor
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12-23-2014 08:34 PM  5 years ago
wc_wickedclown (RIP)

rrProfessor

long beach calif

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meowguy
Stock blade DS76t with new gears.
id recommend a better tail servo

im using a FUTABA S9257 on a blade 450 i did some upgrades to

Watch at YouTube

Insha Allah made in america
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12-23-2014 09:43 PM  5 years ago
dkshema

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Cedar Rapids, IA

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Was afraid it was one of the stock servos...DS76 with or without new gears isn't what I'd choose for the tail on a 400/450 heli.

One other thing. Use the 3GX software to take a look to make sure you are set for SMALL HELI mode. At the same time, take a look at the DELAY setting. It will most likely be set to a default of 30. Using the PC software to watch the actual value, and your transmitter, get the 3GX into the rudder programming stuff -- and the DELAY setting. Set the delay to ZERO, maintaining SMALL heli mode. Once you have this, just sit at that step for about 30 seconds or more so the 3GX times out waiting for you. Don't exit by pushing the button as the 3GX will probably go back to 30% delay.

Exit the SW, you should have programmed and actually RETAINED the 0 Delay setting.
-----
Dave

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

Team Heliproz
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12-24-2014 10:39 AM  5 years ago
meowguy

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Exit the SW, you should have programmed and actually RETAINED the 0 Delay setting.
It took me a few tries on the DELAY setting, but the PC app. now clearly shows I am at 0 delay. I think it was previously at 100. And the heli size reads "Saml" which I will take for small.

Now I just need some decent weather to give it a test. Thanks for your help as always Dave.
"Sweet dreams and flying machines in pieces on the ground." J. Taylor
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12-25-2014 03:25 AM  5 years ago
dkshema

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Cedar Rapids, IA

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"Saml" - yes, that's "small".

Do take the time to trim for no yaw in rate mode. I understand you add some offset during setup, but the best way for the 3GX is to take the few extra minutes to get the Rate mode trim correct.

With V5.0, you will end up running some pretty high gain numbers, perhaps much higher than you would expect from past experience.

You may also want to spend a few test hops while adjusting the Heading Lock gain in the PC software to sort this out.

Just be sure to change one parameter at a time so you know what change had which effect!

Hope you get it sorted out.
-----
Dave

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

Team Heliproz
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12-25-2014 03:16 PM  5 years ago
meowguy

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Do take the time to trim for no yaw in rate mode. I understand you add some offset during setup, but the best way for the 3GX is to take the few extra minutes to get the Rate mode trim correct.
Took this advice this morning. My initial setting was way off. It is dialed in now and requires almost no input of rudder at all to hover in rate mode at -70%. They say it will stop raining soon.
"Sweet dreams and flying machines in pieces on the ground." J. Taylor
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