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GY401: stupid question

Old 05-31-2008, 02:22 AM
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CloudSkipper
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Default GY401: stupid question

Hi,
I'm confused about something. Does the GY401 have no "Heading Hold" mode? Does it do something else? The manual contains no mention of the words "heading" or "hold".

Thanks
Old 05-31-2008, 05:20 AM
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Charlie
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Default RE: GY401: stupid question

Does the GY401 have no "Heading Hold" mode? Does it do something else? The manual contains no mention of the words "heading" or "hold".

"AVCS" mode is heading hold in the manual
Old 05-31-2008, 05:37 AM
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Default RE: GY401: stupid question

Another stupid question here: what is that AVCS?
Old 05-31-2008, 05:48 AM
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Default RE: GY401: stupid question

AVCS stands for Angular Vector Control System.
Old 05-31-2008, 05:51 AM
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Default RE: GY401: stupid question

ORIGINAL: Charlie

Does the GY401 have no "Heading Hold" mode? Does it do something else? The manual contains no mention of the words "heading" or "hold".
"AVCS" mode is heading hold in the manual
Cool thanks. So I guess AVCS (Angular Vector Control System), is the same thing but better? Is the exact behavior significantly different from your usual heading lock/hold gyro?

[link=http://manuals.hobbico.com/fut/futm0807-manual.pdf]The manual[/link] explains a lot in technical terms but I'm not sure if I have the correct jist of it.

EDIT: I finally saw that the bottom right corner of page 1 of the manual contains a little section talking in plain english about how AVCS handles crosswind better (more proactively) preventing weathervaning. So I guess that's the extent of the difference that AVCS adds then? (initially I was distracted by just not being able to find "heading hold" anywhere)

Cheers
Old 05-31-2008, 06:36 AM
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Default RE: GY401: stupid question

Heading hold, heading lock, tail lock, AVCS are all ways of saying the exact same thing.
Old 05-31-2008, 12:40 PM
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Default RE: GY401: stupid question

Angular - as in angles
Vector - as in magnitude and direction
Control
System

So AVCS is the system that controls the magnitude and direction of the angle that the helicopter travels at. Fancy way of saying head holding.
Old 05-31-2008, 12:55 PM
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Default RE: GY401: stupid question

Oh, so, the job of the AVCS (or GYRO, right?) is to measure the angles of the heli? But from which axis? The vertical? I still can't figure how the GYRO works. Can say it to me in simply words? Thanks
Old 05-31-2008, 03:14 PM
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Default RE: GY401: stupid question

Just like NASA. "SLWU", Solid liquid waste unit. Thats why it cost million bucks. An out house is still an outhouse.LOL

Jim
Old 05-31-2008, 04:31 PM
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Default RE: GY401: stupid question


ORIGINAL: Osirisf16

Oh, so, the job of the AVCS (or GYRO, right?) is to measure the angles of the heli? But from which axis? The vertical? I still can't figure how the GYRO works. Can say it to me in simply words? Thanks
It senses a rotation about an axis and applies a correction signal to a servo to counter act it. Most cases, its the rudder. Our flybarless systems use a 3 axis gyro, one on the rudder, one on the elevator, and one on the aileron. It takes the place of the flybar that makes the rotor system more stable.
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Old 05-31-2008, 07:23 PM
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Default RE: GY401: stupid question


ORIGINAL: Osirisf16

Oh, so, the job of the AVCS (or GYRO, right?) is to measure the angles of the heli? But from which axis? The vertical? I still can't figure how the GYRO works. Can say it to me in simply words? Thanks
it senses the rotational angle around the vertical axis (like the main shaft) then outputs the correct command to the tail servo to counter act the rotation.
Old 05-31-2008, 10:42 PM
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Default RE: GY401: stupid question

It's actually angular velocity control system.

AVCS (Active Angular Velocity Control System)
This feature is the equivalent of heading hold, except that it utilizes a gyro sensor that's more accurate and less susceptible to vibration than conventional piezo gyros. It continually sends control signals to the servo , even when the tail is not moving, for extremely low temperature drift and more positive control for hovering and flying in crosswinds.

The Futaba GY-401 gyro can be switched from heading hold or AVCS mode to rate mode with a switch on the TX.

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