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HelicopterFlybarless Rotor Head SystemsAlign 3G › 3gx on 6 volt on Blade 5003d conversion
08-23-2014 02:01 PM  3 years agoPost 1
icanfly

rrElite Veteran

ontario

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Converting to fbl on a 5003d by Blade and want to try the 3gx. From the rx to the 3gx the command wires will be connected to the multi color single pins on the right side of its pin set, rx retained.

This is where I expect dkshema to chime in, if so sir, what settings do you recommend with a dx6i and in the 3gx so I don't get a tipsy heli? I'm willing to conquer the beast and have more time to spend on settings. I did notice a very small "sensitivity" section in a manual for an Align 500fbl heli.

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08-24-2014 04:49 AM  3 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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At a fun fly -- didn't bring my laptop. Will respond in the next day or two after I get home.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-26-2014 05:32 AM  3 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

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3GX installation/setup is easy. You're using a six channel standard receiver with your DX6i as that is your ONLY choice with a six-channel transmitter.

Connect the BLUE gyro Gain wire from the 3GX cable set to the receiver 5th channel output (Gear). Your DX6i will control gyro gain using channel 5.

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Do all your mechanical setup in 3GX DIR mode. Your DX6i must be set for 3 servo, 120 degree swashplate control. Set all sub-trims to zero, all trims to zero. Get the three servos moving correctly with respect to each other using the individual servo channel reverse function in your TX. Once you have the servos moving correctly with respect to each other, use the SIGN of the Aileron, Pitch, and Elevator values in the Swash Mix menu to get the swashplate moving correctly with respect to the control sticks. Function reversing (aileron/elevator/collective pitch is controlled by the sign of the three values.

While operating in DIR mode, all gyro functions are bypassed. With the two control sticks centered (the zero degree, level swashplate setting), you want to make sure the servos are centered and you have the correct servo arm/pushrod geometry for the zero degree setting as shown in the 500 setup/assembly manual.

Get the servo arm position as close as possible to the correct neutral position by experimenting with arm position on the output shaft splines. You'll get close, and will have to make the final adjustment using sub-trim for the affected servo.

Once having the zero degree servo and swashplate geometry setup correctly with both sticks centered, and having everything moving in the correct direction, while still in DIR mode, set your overall collective pitch range to +/- 12 degrees. Use the PITCH value in the swash mix menu for this.

Next, use the AILEron value in the Swash Mix menu to set +/- 8 degrees of aileron cyclic. Set the Elevator number in the Swash Mix menu to the same value as the Aileron number.

All mechanical setup is now correct in DIR mode. CENTER the two sticks (zero degree setting and leave them there. Exit the DIR mode by pressing the 3GX button.

Move the elevator stick full forward, then back to center. Press the button again.

Tilt the nose of the heli up down, watch the swashplate tilt. It should tilt in the opposite direction (heli goes nose down, front of swash tilts up). If backward, move the elevator stick to change the color of the STATUS LED. Check that the swash now responds correctly to nose up/down tilt. Press the button again.

Move the aileron stick full right, then back to center. Press the button again.

Tilt the heli side to side. The swash needs to move opposite the tilt direction. Left heli side down, left swash side moves up. Correct by moving the aileron stick to change the color of the STATUS LED. Verify proper correction movement.

Press the button. The 3GX will initialize. You have successfully completed the initial setup.

Run through the RUDDER settings. Pay close attention that you select LARGE model, ZERO delay, and that you have the right side up/upside down mounting parameter properly set. And make sure you have the correct rudder movement with respect to the rudder stick (correct this at the Transmitter rudder reversing setting), and that the gyro corrects in the proper direction (using the Gyro Normal/Reverse setting).

After all gyro setup is complete, make a zero to 100% pitch curve, and a 0 to 100% throttle curve. Set throttle low, and low trim. Enter the throttle/governor/pitch calibration mode. Move the throttle stick full high, wait for the 3GX to initialize.

This is the basic setup for the 3GX.

Keep in mind to start out with the Aileron and Elevator gain pots on the 3GX set to their default setting, slots at 12 o'clock.

Using the PC interface, find the EXPO setting feature and dial it to ZERO. You'll want to use your transmitter Expo function for aileron, elevator, and rudder.

Set the Aileron and Elevator Expo in your TX to something around 25-30%, set rudder expo around 30%. This should tame the heli down around neutral. You can tweak these values later if desired to match your preference.

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Generally, a well-set up heli will fly quite well with the default settings of the 3GX unit.

Make sure you're using V5.0 software. Prior to flight, change the rudder gyro gain to select Normal/Rate mode operation. Hover the heli, adjust the tail rotor linkage to obtain a hover in which the heli does not want to yaw left or right. Land, reset the travel limits to prevent servo stalling at either end of travel. You can now fly in Heading Hold mode to your heart's content. Start with a gyro gain around 65% and adjust from there. Increase gain until the tail begins to oscillate in fast forward flight, then decrease gain until the oscillation in FFF stops.

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You may have to adjust the collective to rudder precompensation if the heli's nose yaws left or right when you romp on collective.

You may have to adjust the cyclic precompensation if the nose of the heli pitches up or down when you romp on collective.

If the heli wobbles with aileron and/or elevator command, turn the gain pots down (CCW) a bit until the wobbles stop.

Go fly and enjoy.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-26-2014 04:03 PM  3 years agoPost 4
icanfly

rrElite Veteran

ontario

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magic key being uploading v5.0 to program the 3gx then?

I wonder why the gyro gave a quick full left tilt input when it was on the Shuttle shortly, could have had more to do with vibes at the time, and a tail servo drawing too much amps.

Do you plug in the esc to the throttle channel on the 3gx first and run all the colored wires out to the rx that way?

I want to be assured the gyro is not going to cause unwanted complications.

I have a couple years experience in cp and fbl operation with Tarot and Ar72,,bx experience behind me. The 3gx should be fine but I know what the gp780 did, it was an excellent tail gyro. Any abrupt movement from the pitch and yaw axis is unacceptable. On the tail that's forgivable.

I got all the mechanics sorted out early before I ran the topic so that's extra info. Only want to ask what to look out for like default settings with a tweak here and or there. This gyro is for a buddy and it would stink if it goes wonky on us.

Powering the 3gx for 6v is also my concern here.

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08-26-2014 05:58 PM  3 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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6V to the 3GX is NOT a problem. Giving it a good, solid 6.0 volt input will make it happy for a long long time.

V5.0 isn't a magic key. It is the most up to date version, and when you set the heli for no yaw in Rate mode operation, it performs quite well overall. I've upgraded all my stuff now to V5.0 and am happy with its performance.

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What ESC do you plan to use?

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If you were going to use the ESC and its built-in BEC to power your receiver, 3GX, and servos, you MUST insure that the BEC can supply sufficient current under load to maintain the 6V output. If the BEC can't hack it with respect to current, you will have a very short flight.

IF the BEC of the ESC is sufficient (current delivery ability), then you simply plug the ESC into the 3GX THR plug.

If the BEC is NOT capable of supplying sufficient current, you use an external power source. If your servos can hack it, use a 2S LiFe pack to power the electronics. If your servos catch fire above 6V, then use a capable external regulator set to 6.0VDC (BEC Pro comes to mind here, powered by a 2S LiPo, or the main motor battery).

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If you use an external regulator or other power source, there is a good chance you'll need to isolate the red center wire of the ESC to 3GX cable so the internal BEC of the ESC doesn't end up fighting the external power source. (READ your ESC instructions!) I usually remove the three contacts from the ESC cable end, slip a piece of heat shrink tubing over the wires, then insert the two outer contacts back in the plug block where they belong. I then fold the red wire back on itself, slide the heat shrink tubing over it and its contact, and shrink away. It keeps you from chopping that contact off the harness, and leaves the option to reuse the ESC/BEC in a future heli or other application.

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Hook your external receiver to the 3GX using the two sets of cables supplied with the 3GX, the ones having the colored wires. Single wire connector end goes into each RX port, the connector with all three wires goes into the color coded port of the 3GX.

Plug the blue gyro gain lead into RX channel 5.

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Your receiver will get power from the bottom right horizontal connector of the 3GX unit. Use a simple two wire cable between it and your receiver's battery port. You only need the power (center conductor) and ground (left hand side, brown or black) wire. The third wire (white or orange, on the right hand side of the connector block) would normally have gone to the RX output used to control the governor function, something you can't use with a 6 channel TX. Leave that third wire out of the cable.

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Vibrations are a killer, as is a power supply not capable of maintaining voltage at required amperage.

As I recall in your earlier attempt, your FBL controller was essentially mounted on top of the nitro motor, probably the worst spot one could imagine to mount any sensitive electronics.

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Supply adequate voltage.
Supply adequate current.
Hook the 3GX up as shown in the manual.
You need to get power to the RX, as described above. The ground wire between the RX power input and the 3GX lower right horizontal connector is critical to proper operation.

Proper setup as described in my previous post is key. Default parameters, for the most part, work quite well.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-27-2014 02:27 PM  3 years agoPost 6
icanfly

rrElite Veteran

ontario

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I do think the excessive vibes are what killed it on the shuttle, vibes coming from more than the motor alone.

No vibration and lots of power, got it.

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HelicopterFlybarless Rotor Head SystemsAlign 3G › 3gx on 6 volt on Blade 5003d conversion
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