I thought I'd try adding a gyro to my AXN Floater to provide
some el-cheapo stabilisation (when I didn't want the ArduPilot
I found a
heading hold gyro from DealExtreme and hoped it would work (the
standard HobbyKing 401B one wasn't in stock). It really does come
in a "Lithium Polymer Battery" package and had no instructions, but
looking around at similar products on the web gives you the general
idea of how to use it.
It's attached with double sided foam tape and hooked up inline
on the elevator channel and a control channel so I can switch it on
and off mid-flight.
The control channel determines how the gyro behaves:
"Left" or "negative"
The gyro is in rate mode. It will dampen wobbles and slowly adjust
to the new roll angle (i think the delay pot controls how fast this
"Center" or "zero"
The gyro is off and has no effect.
"Right" or "positive"
Heading hold mode, generally used by helicopters and not what is
normally recommended for use in planes. This doesn't really seem to
be a problem, when you let go of the elevator stick it will hold
the current roll angle, rather than levelling itself back out. This
is quite easy to get used to when flying as it's basically what the
plane will do without the gyro but it does mean it handles
differently to how the ArduPilot stabilisation mode works, which is
to "magically" right the plane and keep it flying straight and
level when you let go of the sticks.
To set this up on the Turnigy 9X transmitter, I did the
Go to [AUX-CH] and set CH5 to THRO HOLD (this is the switch on
the back left of the transmitter and will be used to switch the
Go to [PROG.MIX] and set up MIX1 as follows:
Dnrate: 075 (This is the gain, you can tweak this to make it more
or less sensitive)
The above is for "heading hold" mode, for "rate" mode, change
use the values below instead:
Plug the gyro control plug into CH6 on the receiver.
The above is a bit random, FLP probably should be the master and
GYR the slave, but that didn't work for some reason, and ideally
you'd use one of the pots to adjust the gain. Using the PIT TRIM
directly to control the gain works, but doesn't allow you to
quickly find the zero position and switch the gyro off if you need
to, so I went with the switch option instead. Someday I may try and
program this into the 3 position switch so it had off/rate/heading
I haven't flown with it in the wind yet, but expect it should
work and it's certainly a cheap and easy experiment.