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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › 240 Gyro – AVCS Slows Servo
02-06-2006 06:11 PM  12 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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240 Gyro – AVCS Slows Servo

One of the more experienced guys that I fly with flew my Caliber 30 this weekend and noted that the tail responds slowly. I got home and started troubleshooting to see what the problem was.

I have a 240 Gyro with a Futaba 9250 Digital Servo (0.11 sec). This combination should be plenty fast.

However, I noticed 2 different things (all troubleshooting was done with the link disconnected. And I noted that there was no binding in the link):

1. I noticed that when I turned AVCS Off, the servo responds to full left-right movements of the stick very quickly as expected. But with AVCS On, the servo starts off very fast, then at about 50 percent travel – it slows down! It takes it quite a bit of time to get to full travel! It does this in both directions.

2. The servo has more travel with AVCS turned on than when turned off.

Also, I have a Raptor 50 with a 401 gyro and it moves very fast.

Is there something wrong with my Futaba 240 Gyro???


Thanks for your help,
Rockohaulic

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02-06-2006 06:24 PM  12 years agoPost 2
JKos

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Redondo Beach, CA

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Rockohaulic,
If it has more travel with AVCS on then off then it sounds like you must have your rudder ATVs set rather low. What are your rudder channel ATVs set to? Did you set the physical throw limit with the pot on the gyro as should be done?

- John

RR rules!

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02-06-2006 06:41 PM  12 years agoPost 3
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Hmm. the 240 only has a switch for AVCS on/off, a switch for rev/nor, and a gain control.

I will check to see what my rudder channel ATVs are set to...

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02-06-2006 06:43 PM  12 years agoPost 4
JKos

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Redondo Beach, CA

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Oops, forgot that... I guess one must set the travel mechanically, heh? Yes, please check your rudder channel ATVs.

- John

RR rules!

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02-07-2006 05:20 PM  12 years agoPost 5
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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JKos

I assume that ATV is the same thing as EPA (End Point Adjustment). The EPA for rudder was set at 100% for both left and right.

However, I think the question is now a mute point because I did some more experimentation last night.

My girlfriend is finishing a TRex with a GY240 gyro, so I hooked her 240 gyro up to the Caliber 30, and I got the same thing - The servo starts out fast, then slows down.

Then I connected her GY240 to my Raptor 50 which normally has a 401 with a Futaba S9253 (which moves the tail very fast). With the 240 it did the same thing - started fast and then slowed down.

Then I tried hooking the GY240 to a non-digital servo to see if it was a compatibility issue with digital servos. It wasn't. It behaved the same with an analog servo.

So, I tried 2 different 240's, and 2 different receivers and 2 different transmitters, with the same results.

I guess the 240 is just a slow gyro.

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02-07-2006 06:33 PM  12 years agoPost 6
JKos

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Redondo Beach, CA

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Rockohaulic,
Try cranking up the ATV/EPA a little and see what happens.

- John

RR rules!

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02-07-2006 06:55 PM  12 years agoPost 7
DANNO

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St. Petersburg, Florida

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yea the 240 is slow. i think it might not be designed for digital servos like the 410...i had one and it held the tail fine but was a little sluggish......but it might be goot for video as it dampens your rudder imputs....

www.skypiximaging.com

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02-07-2006 07:00 PM  12 years agoPost 8
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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JKos,

Sounds good. THanks for the input.

I believe the max EPA with my radio is 125%.

So is 125 recommended, or is "a little" closer to 110 or so?


The GY240 was a big step better than the original non-heading hold gyro that came with this helicopter (my first), but after learning this, I'm glad I went with the more expensive GY401 on my Raptor 50!

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02-07-2006 07:02 PM  12 years agoPost 9
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Hmm, I guess a fast digital servo is a waste of money with a GY240!!

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02-07-2006 08:50 PM  12 years agoPost 10
kevinb902

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Canada

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( fast servo a waste )not in the air your input is slow but gyro input will be faster try turning down delay on 401 it will look the same as the 240 kevinb

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02-27-2006 06:22 PM  12 years agoPost 11
Rickrotorhead

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Lutz, FL USA

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Check out the GY240 users guide (manual) possibly for your answer.

Under the paragraph titled <Other Precautions>, it says..."To improve the tail control characteristic, a delay function is added to the rudder control signal from the transmitter. When the signal is passed through the gyro, movement of the servo is slower than the transmitter rudder operation. This is normal."

...just downloaded the manual this morning as I am thinking of buying one...

Rick Merrill

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