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3D Flying Discuss everything related to "3D" flying including construction, power setups and flying techniques

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Old 03-12-2014, 06:08 PM   #1
GunnyJeeves
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Default Arkbird Tiny Accelerometer+Gyro Autopilot

I will be trying this out on a Tech One yak 55 before deciding on an autopilot for my large Yak 54.

http://www.nitroplanes.com/02a-yak55-arf.html

Overall - Fairly light. Not too heavy.
Futaba style connections. - AETR
Not too much fuss setting it in place.

The GOOD:
The concept is that a gyro will drift, and an accelerometer is less accurate, but balancing the two of them, lets the plane not just maintain heading or angle but KNOW that the angle is 0 degrees or 45 degrees.

Supports auto-level (Max of 45 degrees in any direction, plus return to level by releasing sticks.) GYRO mode. (Corrects for wind like normal gyro only) and Hover assist. (basically hands off hover.)

The BAD:
Seems bad, but trimming seems to be a bear. The accelerometer will adjust if the plane is not level (or the unit is not level) and you can see what it thinks is level by moving the plane until the ailerons are actually level. This may be by design and actually good. Will know when I fly it.

This is bad for large scale planes, but seems typical of gyros and autopilots. There is only support for one aileron and one elevator. That caps the size or requires something like a PDU (Power Distribution Unit) to handle systems like mine with 1 rudder, 2 elevators, and 2 aileron servos.

The only option that handles all that without some outside help is a Demon Cortex at $350.

We'll see where this gets me.
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Old 03-12-2014, 06:41 PM   #2
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Dual elev and aileron... just connect one of each. It will work. The offset elevator might induce a bit of roll but the aileron will correct for it.

Many pylon racers operate on one aileron and one elevator half.
Not good for precision aerobatics but its just fine for keeping control of the model.
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Old 03-12-2014, 06:46 PM   #3
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Originally Posted by fhhuber View Post
Dual elev and aileron... just connect one of each. It will work. The offset elevator might induce a bit of roll but the aileron will correct for it.

Many pylon racers operate on one aileron and one elevator half.
Not good for precision aerobatics but its just fine for keeping control of the model.
That's just crazy enough to work. That's scary.
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Old 03-12-2014, 07:34 PM   #4
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Originally Posted by fhhuber View Post
Dual elev and aileron... just connect one of each. It will work. The offset elevator might induce a bit of roll but the aileron will correct for it.

Many pylon racers operate on one aileron and one elevator half.
Not good for precision aerobatics but its just fine for keeping control of the model.
Many years ago I had a sailplane that used Rudder/elevator/motor. By design, the elevator servo only operated one half of the elevator. It worked just fine. Did a lot of flying with that thing.

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Old 03-30-2014, 12:57 AM   #5
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Quick update...

The Arkbird does great.

3d assist sets hover position as level, and puts plane in auto level mode.

Normal auto level limits to about 45 degrees each direction with return to level if sticks released.

Normal gyro mode corrects unexpected moves.

Great value for $65!
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Old 03-12-2014, 06:44 PM   #6
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My Turnigy 9XR Settings:

Ch5 < 50 = All gyro functions off.
Ch 5 > 50 = Functions ON.
Ch 6 < 30 = Auto level
Ch 6 30-70 = Gyro Only. (Anti-Wind)
Ch 6 > 70 = Hover.

Primary Mix:
Gear switch arms the arkbird.
ID0 = Autolevel
ID1 = Gyro Only
ID2 = Hover Mode

Secondary Mix (Replace)
Throttle on = CH5 to 100 and CH6 to 100
(Overrides and pops into hover mode.)
Throttle off, back to normal.

Harier down, nose up, hover and flick. :-)
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Old 03-12-2014, 06:51 PM   #7
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That would also mean I could go psycho with mixes too. Hmmm... You've no doubt seen the Precision Aerobatics Addiction X (make ailerons mirror or oppose ailerons or possibly make elevators duplicate aileron positions as well.)

Crazy thoughts come into play with this.

I have a platform to use for that kind of testing though...

http://www.nitroplanes.com/05a330-red-arf.html

It has dual ailerons and dual elevator halves.
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Old 03-12-2014, 07:04 PM   #8
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Tests were done in the late 1970's or early 1980's regarding dual RXs with each operating half of the model... for redundancy.

Purposefully setting one RX's aileron and elevator half off center then switching that RX off in fight the plane was still controllable.

We used to recommend multiple RXs to eliminate long wire runs in large models and to split up the servo loads. We also used to make special "Y" harnesses to power the retract servos from a different battery from the flight control servos, since a jammed retract could pull the battery down fast when using mechanical retracts.

"Old school" stuff...
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