Futaba 401 Gyro how do I tune this thing? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-21-2016, 06:23 PM   #11
Cougar429
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Re: Futaba 401 Gyro how do I tune this thing?


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The tape I refer to is from Scotch and I think I paid approx $6. Enough for lots of uses.
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Old 08-21-2016, 10:14 PM   #12
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Re: Futaba 401 Gyro how do I tune this thing?

I have some industrial two sided sticky tape that holds very well it's about 1/16 of an inch should I double the thickness?
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Old 08-21-2016, 10:15 PM   #13
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Re: Futaba 401 Gyro how do I tune this thing?

Quote:
Originally Posted by cassat View Post
I have the actual video for the 401 and the 7C radio on file in PDF format
if you need it. makes life easier. And no, you don't need $30 gyro tape, just make sure
the wires aren't bundled and straining or pulling on the gyro.
I'd like to have that Dave if you don't mind I'm getting much help from you guys thank you.
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Old 08-22-2016, 07:20 AM   #14
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Re: Futaba 401 Gyro how do I tune this thing?

It would depend on the material. You want something that will dampen out vibrations without being too soft. That would allow the gyro to move from inertial and give false readings.

With the tape I recommended doubling works perfectly.
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Old 08-22-2016, 11:27 AM   #15
bensidus197217
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Re: Futaba 401 Gyro how do I tune this thing?

Thanks Gary I think I actually have some of that tape kicking around from when I fastened two cheap tables one on top of the other to make a high TV stand with a shelf.
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Old 08-22-2016, 09:46 PM   #16
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Re: Futaba 401 Gyro how do I tune this thing?

Gary I used your sticky tape Dave I used your specs for setup. I dropped the RPM between 5% and 8% at throttle midpoint plus increased pitch at throttle mid point 5% and 8% now all is much better plus the ESC and battery are not heating near as much as they were. I think by having the battery draw too it may have been causing burps in the rest of the electronics such as the gyro. I think I have it beat but can someone tell me what size tail rotor blades I need from Align?
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Old 08-23-2016, 09:11 AM   #17
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Re: Futaba 401 Gyro how do I tune this thing?

Sorry is it a trex 500? Then 70 or 72mm are the correct ones. Zeals the center hole is to small on the 70's, use the Align plastic blades very durable for you.
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Old 08-23-2016, 08:04 PM   #18
bensidus197217
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Re: Futaba 401 Gyro how do I tune this thing?

OK thanks Jimmy I'll order them up.
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Old 09-16-2016, 12:21 AM   #19
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Re: Futaba 401 Gyro how do I tune this thing?

Well I have had some luck but it seems the red gyro light starts randomly flashing at times and it often wants to drift the tail to the left. Tonight it started to rotate right with no means of control from me so I had to drop it. I buggered up my tail rotor gear and I don't know yet what else. It was like the gyro wasn't involved, my other 401 did the same thing so I changed it. I'm wondering if it is a plug connection problem?
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Old 09-16-2016, 07:52 AM   #20
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Re: Futaba 401 Gyro how do I tune this thing?

What tail servo are you working with? Asking as a few are limited to 4.8-5V.

Also, the flash mode gives you an indication of what's happening. Which best represents what you see?

Rapid Flash: Displayed while data is being initialized at power ON.

Steady Light: Indicates that the gyro is operating in the AVCS mode.

Off: Indicates that the power is OFF, or the gyro is operating
in the normal gyro mode.

Slow Flash: Displayed when there are no rudder operation signal being
input from the transmitter. At this time, the rudder servo
does not operate.

Intermittent Flash: 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.

Double Flash: Displayed when the rudder signal from the transmitter
in the AVCS mode is different from the neutral signal
memorized in the gyro. Also flashes when the rudder stick
was operated.

Single Flash: Displayed only when the transmitter sensitivity switch is
rapidly switched between the normal and AVCS positions
at least 3 times, then returned to the AVCS position and
the transmitter rudder stick was rapidly moved to the left
and right at least 3 times. After this display goes off, the
rudder is in the neutral position.

ps. I was able to grab a "Lazy Susan" from a Habitat store and think they are also available at H/D. A trick is to anchor it down and fab a plate large enough for the main gear. Fasten down the heli so the main shaft is centered while the main rotor and the tail are clear to rotate. This provides a solid base to prevent the heli from lifting while allowing you to safely see what is happening with the tail rotor. This way un-commanded servo excursions don't risk the heli.
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Last edited by Cougar429; 09-16-2016 at 08:26 AM.
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