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HomeAircraftHelicopterHelicopter Main Discussion › TREX 700 NITRO converting to FBL with 3gx
02-21-2013 05:33 PM  5 years agoPost 1
JOK-JOK

rrNovice

Pickering Ontario Canada

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Any help and information would be greatly appreciated.

I have the fbl head from RJX, the 3gx , the old gv-1, gv 611 and the ar8000 rx.

1.Do I need special links for the new head ?

2.Can I use my gv-1 's sensor to hook it up to the 3 gx?

3.The best location for the 3gx?

If I would be able to do this , this will definitely make my 700 very neat.

Advance thanks for anyone who can pitch in some infos.

Cheers
J

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02-21-2013 06:32 PM  5 years agoPost 2
Propwash3D

rrApprentice

ohio great lakes

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reciver
first off i would ditch your reciver and use 2 sattelite dsmx plug those directly into your 3gx unit and bind. I would use a magnet sensor..best place to put the 3gx unit is in the nose up on the gyrp plate stand...the head you bought should have came with all the links that you needed You might also need the new swash, however like i said im not sure about the head you bought...if you bought the align head dfc or otherwise regular standars swash follower head would have been much easier for you my man

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02-21-2013 07:35 PM  5 years agoPost 3
JOK-JOK

rrNovice

Pickering Ontario Canada

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TRex 700 Nitro ----- 3gxFBL
Thanks Propwash3D.
I'll keep that in mind.

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02-21-2013 07:48 PM  5 years agoPost 4
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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The 700 has a place on the fan shroud for an Align magnetic sensor.
The standard Futaba GV-1 sensor doesn't fit in 700 fan shroud or the sensor input on the 3GX. The Align magnetic sensor is like $10 USD.

I would also recommend using the Sats instead of the AR8000.

I don't have anything else to add about the RJX head.

Be aware - the FBL head will cause the servos (DS610??) to draw a lot more current from the battery.
I would invest in a good regulator (not the Align 2-in-1 or the Castle Creations BEC Pro 20) and use a 2200mAh or bigger LiPo.
I would recommend the Scott Gray Reactor X2 or the Gryphon Extreme. These are solid regulators and drive the 3 swash servos separately from the 3GX.

I have heard good things about using a LiFe pack directly to the receiver / 3GX (no regulator). But, I haven't tried it.

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02-22-2013 03:18 AM  5 years agoPost 5
JOK-JOK

rrNovice

Pickering Ontario Canada

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TREX 700 NITRO converting to FBL with 3gx
ticedoff8

Thanks... that's a very good point.Voltage regulator.

There's a part that I do not quite understand.
"These are solid regulators and drive the 3 swash servos separately from the 3GX."

The swash servos are connected to the 3gx and if I powered up the 3gx separately,where is the regulated power going to?

BTW : I am using 2S 2300mAh for the electronics of the T Rex 700 N.

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02-22-2013 04:32 AM  5 years agoPost 6
koppter

rrApprentice

Virginia

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i had two 700s (now one)with 610s and 2n1. works fine.

both used 3gx and align sensor/gov.

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02-22-2013 04:45 AM  5 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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If you're using the 3GX, you'll have no need for the GV-1 governor or the GY-611 gyro. Both will be useless in an FBL setup. Off-hand I don't know if the GV-1 sensor is compatible with the 3GX unit. At a minimum, you might have to swap the power and ground leads on the sensor plug. Ask around to be sure.

The 3GX has a built-in governor, just add the sensor, and it has the tail rotor gyro also integrated.

If you're using a DX-8 transmitter AND if you go the route of using Spektrum satellites instead of the AR8000, you will HAVE to reassign the Gyro and Governor channels on your DX-8.

The DX-8 will default to controlling the Gyro using Channel 5 (Gear), and controlling the Governor using Channel 7 (Aux 2).

When using stand alone Spektrum satellites, you will need to tell your DX-8 to control the Gyro using Channel 7 (Aux 2) and the Governor using Channel 5 (Gear). There is NO OTHER OPTION if you go that route.

If you choose to hook up your AR8000 instead of using just Satellites directly connected to the 3GX unit, you can connect the receiver channel 5 and channel 7 outputs to the "correct" plugs on the 3GX unit so that you can continue to use the DX-8 in its default configuration.

If you do use the AR8000 receiver, get a bit creative on how you power the system, as you need to be able to supply adequate current to the 3GX unit and its attached servos. The receiver doesn't require massive amounts of current, and there are good ways to get good current handling capacity to the FBL controller while getting power and ground over to the separate RX.

-----

If you use servos capable of being powered from a 2S LiPo, the 3GX unit will accept 7.4 volts directly, as would your AR8000 should you go that route.

If your servos aren't up to a 2S LiPo or even 2S LiFe pack, then a regulator is needed.

-----
Dave

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

Team Heliproz

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02-22-2013 05:18 PM  5 years agoPost 8
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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NEVER use a LiPo without a regulator unless you have the new (and expensive) HV servos.

On the Scott Gray and the Gryphon regulators, the swash servos connect to the regulator - not the 3GX.
There are 3 "jumper cables" that connect from the Scott Gray / Gryphon to the 3GX.
The servo signals are sent from the 3GX and "pass through" the regulator.
But, the servos get their operating voltage / current from the regulator (switch selectable for 6v, 6.8v or direct LiPo voltage) through their connections to the regulator. This ensure each servo is getting all the current they demand and not have to share the wires.
The 3GX gets it's power through the "jumper cables" that connect the regulator to the 3GX. This voltage is fixed at 5.2v at 5amps. This allows you to use 4.8v servos on the throttle & tail rotor without worrying about the step down.

As for using the Align 2-in-1 on the 700 - it will work right up to the point where you push the heli too hard - then you crash.
If you are a simple sport flyer and never get a little "out of control", then it might be okay.
But, if you get a little out of shape, panic, and hit collective too hard - the Align 2-in-1 will brown out the you are totally FUBAR.

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02-22-2013 05:32 PM  5 years agoPost 9
JOK-JOK

rrNovice

Pickering Ontario Canada

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regulator
Thanks again.

I think as of now I will use the stock reg. But will still get the better ones so I can gain more experience through it . I like that idea to separately powering the servos so the rx or 3gx is less disrturb by the current draw caused by the swash servos for it will now be FBL .

I'll be watching as infos come in.

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02-22-2013 06:45 PM  5 years agoPost 10
JasonJ

rrKey Veteran

North Idaho

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A lot of people use 2-in-1s without problem. Be careful when listening to what *will* happen, that is speculation at best. Info like this tends to come when someone either heard from a guy who got a text from a guy that was watching a video of a guy that was emailed that 2-in-1s cause brownouts in panic situations or they just simply speculate. Not saying it hasn't happened ever. I did a search and other than the switch thing I can't find a post stating a 2-in-1 caused a brownout and downed a helicopter.

A better way to look at it is it *could* happen but a lot of things *could* happen. Lord knows there are better options than an Align 2-in-1 but most likely you will be fine.

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04-16-2013 04:43 PM  5 years agoPost 11
JOK-JOK

rrNovice

Pickering Ontario Canada

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3gx connection with ar8000
Ok folks, need some tips here.

I am in the process of wiring the 700 nitro heli.
I am not sure if sats must be connected to both receiver and 3gx.

I am planning to hook up the power to rx from the align regulator/bec and power up the 3gx from a separate ubec/regulator through its "BATT " port.

Though I know that I can power them both from one source, I really wanted to have the power to the servoes separate from the rx.

A wiring diagram of ar8000 and 3gx would be a great help. Anyone might have a better configuration than the one I am doing.

By the way , I am using JR 11x on this project.

Help from fellow enthusiasts will be greatly appreciated.

Thanks

J

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04-16-2013 06:01 PM  5 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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When using a full-up standard external receiver such as the AR8000, the satellite plugs into the AR8000, NOT the 3GX controller.
I really wanted to have the power to the servoes separate from the rx.
Why, what are you wishing to prevent?

-----
Dave

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

Team Heliproz

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04-16-2013 09:32 PM  5 years agoPost 13
JOK-JOK

rrNovice

Pickering Ontario Canada

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Coz i don't have enough juiceto get the co.start movement of the servoes. My 2s for the rx is only 2300mah.
I am planning to use 3s for the servoes.

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04-16-2013 10:01 PM  5 years agoPost 14
sonnyhad

rrProfessor

Holland,Mi

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I really don't think you wanna use 3s for your servos!

Bald Pilots usually wear hats!

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04-16-2013 11:10 PM  5 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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I am planning to use 3s for the servoes
Why, do you hate them and wish them all to catch fire and fry when you first apply power?

-----

What servos are you planning to install in a 700 that can sustain a 12V input without melting down? Running a servo from 12+ VDC will pretty much let all the magic smoke out in a hurry.

-----

I don't know of any servo, "high voltage" or otherwise, rated for more than a 2S LiPo.

-----

2300 mah has NOTHING to do with the "S" selection of your battery pack.

The mah rating is battery CAPACITY.

A "1S" LiPo has an output voltage of 3 to 4.2 volts, depending upon its state of charge.

A "2S" LiPo has an output voltage of 6 to 7.4 volts, depending upon its state of charge.

A "3S" LiPo has an output voltage of 9 to 12.6 volts, depending upon its state of charge.

All three variations can have the same energy capacity, 2300 mah.

----

Using "high voltage" rated servos (7.4 volts nominal), you can power your entire system from a 2S LiPo (or 2S LiFe pack) without the need for any regulator in the system. The 3GX controller can handle a 2S LiPo directly, as can your AR8000.

-----

You should be more concerned with making certain the wires and plugs between your power source and the 3GX controller are adequate enough to handle the servo current. Your receiver only needs 30 ma or so to operate. The current is needed at the 3GX servo connections.

-----

I'll try to supply a simple wiring diagram later this evening.

-----
Dave

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

Team Heliproz

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04-17-2013 01:04 AM  5 years agoPost 16
JOK-JOK

rrNovice

Pickering Ontario Canada

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Thanks Dave.

I just got freaked out about the system might shut down in the
air while the servoes suck all the current from the rx.
I still haven't powered up the set up.
I thought the ubec will reduce the input voltage and will deliver 5v or 6v depending on my need.

Your time and effort is very much appreciated.

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04-17-2013 02:47 AM  5 years agoPost 17
dkshema

rrMaster

Cedar Rapids, IA

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BTW -- I don't think you've ever said which transmitter you are using...

That makes a small difference in the way you hook the AR8000 RX up to the 3GX unit.

-----
Dave

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

Team Heliproz

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04-17-2013 03:44 AM  5 years agoPost 18
JOK-JOK

rrNovice

Pickering Ontario Canada

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Ok.

I am using JR 11X for this set up.
I followed the 3gx's instruction on how to connect the standard Rx to the 3gx. I am still wondering how am I going to control the gain ?

on the AR8000:
batt/Data--(normally this is where I hooked up the power from 2in1)
thro--------to purple terminal of the 3gx
ail---------to red ''
elev--------to orange ''
rudd--------to green ''
gear--------to blue ''
aux 1-------to yellow ''
aux 2------- ?????
aux 3-------( planning to connect gv-1 as tachometer)
( can also be used to obtain power from the 3gx )

What are the channel designations of this particular rx ?
ch 1 =
ch 2 =
ch 3 =
ch 4 =
ch 5 =
ch 6 =
ch 7 =
ch 8 =

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04-17-2013 04:30 AM  5 years agoPost 19
sonnyhad

rrProfessor

Holland,Mi

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Use google to look up your rx and you'll have your answer. I'm surprised it doesn't say right on the rx.

Bald Pilots usually wear hats!

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04-17-2013 03:41 PM  5 years agoPost 20
dkshema

rrMaster

Cedar Rapids, IA

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Try this:

Your 11X should be set to default to use Channel 5 for GOVERNOR control (GEAR) and Channel 7 for GYRO GAIN.

Try to find a way to get adequate power (current handling capability) to the 3GX unit, since the servos get their power and ground on the 3GX connector block. The RX gets its power from the 3-wire cable connecting the 3GX unit to the RX Governor control channel. This works fine, as the RX is not a high-current device.

-----
Dave

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

Team Heliproz

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