Espritmodel.com Telemetry Radio
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Old Apr 23, 2013, 01:14 PM
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Mini-HowTo
OrangeRX RX3S Flight Stabilizer on Crack Yak and other foamies

I've recently been playing with the OrangeRX RX3S Flight Stabilizer on my Crack Yak. You can pick up the RX3S for $24.99 from Hobbyking. I have a couple more on order to try on other planes.
http://www.hobbyking.com/hobbyking/s..._Receiver.html

I only have the stabilization enabled in low rates mode when practicing precision aerobatics. When flying 3D in high rates mode, I have it disabled completely.

Here's a quick video showing it in action. I was making very little headway flying full throttle into the wind!

(Watch in full screen so you can see the plane)
Full throttle into the wind! (1 min 8 sec)


I'll post my set up and links in the following posts.
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Last edited by jcansdale; May 21, 2013 at 06:34 PM.
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Old Apr 23, 2013, 01:14 PM
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Reserved for hardware set up info

The unit weighs 15g with case. If you remove the case it comes down to 6.48g (or 6.71g with mounting pad).

I'm using these mounting pads:
http://www.hobbyking.com/hobbyking/s...0pcs_bag_.html

I cut up a mounting pad and stuck small pieces to any bare parts of the board. With these pads there is just enough clearance for the surface mount capacitors under the board. Add a L-shaped piece in the corner under the servo connectors. You'll be pressing down here when you connect the servos and don't want the opposite corner to lift up.

The servo connectors need to be closest to the tail, but the unit can be mounted upside down if you reverse elevator and rudder. On the dip switches I have ELE and RUD servos reversed and AUX1 set to toggle the gyros (switches in the up position).

After attaching the board, I added a small dab of glue to the end of each antenna and stuck it to the foam. This should stop them flapping around and keep them at a nice 90 degree angle.

My pitch and yaw gains are set to about half way and my roll gain is a bit less than half way. Try doing a fast roll and if it pauses as it turns, back off the gain a little. I find these settings work well for flying in lots of wind.
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Last edited by jcansdale; Apr 25, 2013 at 10:24 AM.
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Old Apr 23, 2013, 01:15 PM
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Reserved for radio set up info

I have 3 aims with my radio set up:

1) To change DR, expo and stabilization on a single switch. Stabilization will be on for precision aerobatics (low rates) and off for 3D (high rates).
2) To fly with stabilization on but still be able to do a snap roll without flipping switches. If you do a snap roll with stabilization on, it tends to fight it.
3) To have a master switch that can disable stabilization. Stabilization will be off in its default position. This will help remind me that I'm using it!

I'm using a Spektrum DX8. I've attached my model configuration file below (see 09CRACKY.spm). Here's what I did:

First I'm going to select my switches. I'm going to use the F Mode switch for both D/R, expo and stabilization. This needs to be mapped to Aux1 which enables and disables stabilization. I'm going to use Gear as a master override for when I want to fly without stabilization. I'm mapping this to Aux2 so I can use it in a custom mix.

I want stabilization to be always on in F Mode 0, mostly on in F Mode 1 and never on in F Mode 2. To do this I need to reverse the Aux1 channel. This will make it so that stabilization is active in F Mode 0 and 1. The F Mode switch can also be used for DR and expo.

When I'm in F Mode 1 and do a snap roll, I want stabilization to be momentarily disabled. To do this I'm going to create custom ELE > AX1 and RUD > AX1 mixes. I want it so that when I input elevator or rudder, the AX1 value is increased until eventually stabilization is disabled. To do this I'm setting the mix rates to -50% and 50% for both mixes (AX1 the value will increase when the stick is pushed in either direction). I'm only enabling these mixes in FM1.

I now want to make it so that stabilization will be disables when the Gear switch is in the down position. This means I will have to explicitly flick a switch if I want the option of using stabilization. I never want to forget that I'm using it! To do this I'm going to create a AX2 >
AX1 mix. I have mix rates set to -125% and 0%. Unfortunately there isn't enough reach to ensure that stabilization is disabled in F Mode 0, so set up a 4th mix that is exactly the same as mix 3. (this feels like a hack, can anyone think of a better way)

Okay, we're done. Time to flick Gear into the up position and fly! Let me know what you think.

Maybe someone could share a DX6i model configuration?
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Last edited by jcansdale; May 18, 2013 at 02:50 PM.
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Old Apr 23, 2013, 03:16 PM
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Old Apr 24, 2013, 12:37 PM
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OrangeRX RX3S naked weight

I finally got around to weighing the OrangeRX RX3S without its case. The naked board weighs 6.48g and the case 8.16g. When you include some gyro mounting pad, the total weight is 6.71g.

For comparison the 4 channel OrangeRx R410 weighs 2.64g (I'm guessing most people will be using this). This means the flight stabilization functionality will cost you 6.71g - 2.64g = 4.07g. Not too bad.

I use these mounting pads:
http://www.hobbyking.com/hobbyking/s...0pcs_bag_.html
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Last edited by jcansdale; Apr 24, 2013 at 12:46 PM.
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Old Apr 24, 2013, 02:49 PM
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OrangeRX RX3S links

OrangeRX RX3S 3-Axis Flight Stabilizer w/DSM2 Compatible 6CH 2.4Ghz Receiver
http://www.hobbyking.com/hobbyking/s..._Receiver.html

OrangeRX RX3S User Guide
http://www.hobbyking.com/hobbyking/s...X520622X49.pdf

OrangeRX 3-Axis Flight Stabilizer
http://www.rcgroups.com/forums/showthread.php?t=1702672

You can re-flash the OrangeRX RX3S with alternative firmware. The firmware includes features such as in-flight adjustable gain and heading hold mode. I haven't done this yes. See this thread:
Open Flight Stabilizer
http://www.rcgroups.com/forums/showthread.php?t=1794672


Spektrum AR635 links

AR635 Product Page
http://www.spektrumrc.com/Products/D...rodID=SPMAR635

AR635 Manual
http://www.spektrumrc.com/ProdInfo/F...-Manual_EN.pdf

AR635 First Stand Alone Spektrum RX with AS3X
http://www.rcgroups.com/forums/showthread.php?t=1798807


Eagletree Guardian links

Eagletree Guardian Manual
http://www.eagletreesystems.com/supp...an%202D-3D.pdf


Using Gyros on an RC airplane
http://www.rcgroups.com/forums/showthread.php?t=1035605

Information for how to install and set up a gyro onto your fixed wing aircraft
http://www.mycoolrc.com/gyro/indexnew.html

List of reviewed gyros (including dedicated 3 axis airplane gyro systems) 
http://www.mycoolrc.com/gyro/gyroLINKS.html


Are there any useful links I've missed?
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Last edited by jcansdale; May 20, 2013 at 06:00 PM.
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Old Apr 25, 2013, 04:56 AM
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I've updated the "Radio set up" post with my DX8 model configuration. Maybe someone with a DX6i or other radio could share how they're using it?
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Old Apr 25, 2013, 07:58 AM
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Old Apr 25, 2013, 09:10 AM
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I think this will be great for foamies on those windy days and you just want to fly!
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Old Apr 25, 2013, 09:38 AM
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nice...

ive been interested in these for a while but couldnt see it working on a 3D plane... you can certainly tell the difference in the way it was flying with it on/off.

as an outdoor flyer only, and someone who doesnt like to wait for those perfectly calm days to fly, this is intriguing.

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Old Apr 25, 2013, 09:44 AM
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Subbed lol
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Old Apr 25, 2013, 10:04 AM
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interesting, just orderd up a few units, Im trying to get some friends over do 3d planes, this might be a way to temp them, also they complain about flying in wind a lot.
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Old Apr 25, 2013, 10:06 AM
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I have one mounted on the Flash by RC Factory. It's on the bottom just behind the wing, held on with Velcro and a Velcro strap aroud it to steady it. I'm not much of a switch flipper as I can't remember which one does what.
The ammount of control is a balance between you and the gyro. When I found it was slow doing the snaprolls etc. I backed off on the gain to give me more control. The gyros still work great to stabilize it when the sticks are at neutral. I also have one in a scratchbuilt VTO Pogo. which works well on the vertical landings. This is excellent for 3D planes where you very high throws on the surfaces, yet locks in on the neutral settings in the wind. That's where it really shines.

Gord.
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Old Apr 25, 2013, 11:43 AM
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Quote:
Originally Posted by flypaper 2 View Post
The ammount of control is a balance between you and the gyro. When I found it was slow doing the snaprolls etc. I backed off on the gain to give me more control.
I think it's always going to interpret the autorotation of a snap roll as un-commanded movement and try to counter it. You might like to try my transmitter set up from post 3. I've made it so when pulling lots of elevator and runner it will disable the gyros for a moment. This lets you do nice round loops and snappy snap rolls.
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Old Apr 25, 2013, 01:19 PM
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@jcansdale:
Nice, thanks for the very informative "how to" set up! (your post #3)
And as for the same mix twice, I had to do the exact same thing on my DX18QQ for a Throttle cutoff function of the rotary knob. A single mix just doesn't give you enough throw in some circumstances.
As fot the snaproll on the AR635 (with a Visionaire surrounding it ;-)): you are quiteright, it looks much better (more heading change in respect to flightpath) with the rx in low gains (general mode) iso 3D mode...
Cheers!
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Last edited by MartinT; Apr 25, 2013 at 01:24 PM.
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