Futaba 6EX 2.4 GHz trimming issues very serious!!!!

[khaled_abobakr]

The problem

During the setup of my T-REX S CF helicopter

1- Phoenix 35 ESC
2- SportBEC 6V External battery eliminator circuit
3- No motor is connected to the ESC
4- No Gyro connected which will be channel 5
5- No tail servo connected which will be channel 4
6- 3 X Hitec servo HB-65MG metal gear micro analog servos
7- Thunder power 3S 11.1 V 2100 mah
8- no gyro connected
9- no tail servo connected
10 - ch1 aileron(pitch) - ch2 elevator - ch3 throttle- ch4 rudder - ch5 gyro - ch6 pitch (aileron)


no motor is connected to the ESC , EPA, D/R , EXPO, I-TH, I-p , N-TH , N-P and all curves are set to default

I've setup the model type as HELI
Swash type is 3-S........................ CCPM 120

Each time I want to trim channel 1 servo I notice that also channel 6 servo moves
when I trim channel 2 I notice that channel 1 and channel 6 move too

when I tried triming channel 3 or channel 4 and they r not connected to any servos just blank channels I noticed that channle 1 and channel 2 and channel 6 do not move ( works correct)

this happens when I do trimming using the programming mode or use the trim buttons beside the sticks

When I set the swash type to 1-S to disable the channel mixing and I tried trimming each channel alone it worked correctly then when I set the swash back to 3-S CCPM mixing 120 after I've finished trimming the channels in 1-S mode the trim adjustment I made was gone and channel 1 and channel 6 servos move together when I trim channel 1 servo only using the trim function in the programming mode or the trim buttons beside the sticks it seems that channel 6servo can remember the trimming made to channel 1 during 1-S mode and once I set the swash to 3-S it moved according to that trim adjustment originally made to to adjust channel 1 servo

Any help is greatly appreciated ... I'm really lost

[DavidH]

http://www.helifreak.com/showthread.php?t=49147

[TheJackal]

Khaled I think you need to do a lot more reading of this site.
All the info you will ever need about helis is on here. I am building my first heli and even I realise you cant just plug it in and expect it to work without a lot of research.
At the end of the day these arent toys.

[Windbreaker]

I'm new to this, too and managed to get my T-Rex operational in three days. Never did anything with RC until now. And the only helicopter experience is the time I spent shooting photos and videos from the full-scale thing.

Before messing with the radio system I made sure that the helicopter was mechanically configured properly.

I have a Futaba T6EX and am using all Futaba digital servos. Here's my settings if that might help:

REVR:
Ch 1 = Rev
Ch 2 = Rev
Ch 3 = Rev
Ch 4 = Rev
Ch 5 = Nor
Ch 6 = Nor

DR:
Ch 1 = 100%
Ch 2 = 100%
Ch 4 = 100%

EXPO
Ch 1 = 0%
Ch 2 = 0%
Ch 4 = 0%

EPA
Ch 1 = 100% both ways
Ch 2 = 100%
Ch 3 = 100%
Ch 4 = 100%
Ch 5 = 100%
Ch 6 = 100%

Trim = all zero

N-TH, on
1 = 0%
2 = 40%
3 = 65%
4 = 85%
5 = 100%

N-PI, on
1 = 0%
2 = 25%
3 = 50%
4 = 75%
5 = 100%

I-TH
1 = 0%
2 = 25%
3 = 50%
4 = 75%
5 = 100%

I-PI
1 = 0%
2 = 25%
3 = 50%
4 = 75%
5 = 100%

HOLD, off. 0%

REVO, on. 0%

GYRO: 60%

SW-T, on
A = 0%
E = 0%

SWSH: 3-S
A = -50%
E = +50%
P = +50%

FS: Ch 3

Hope this helps.
Dean.

Edit: Just to let you know, I haven't flown it yet. Just spun it up and got it light on the skids to make certain there's nothing fundamentally wrong with the setup. I might make adjustments in the dual-rate of the rudder as that seems too sensitive for my tastes as a beginner. My prior flying experience included being a pilot for a fish spotter a few months back in the 1980's. Before that it was a couple of line-controlled airplanes as a kid.

[daijoubu]

The T6EXH does not have sub-trims. You need to fix your set up mechanically.

[jeffros1805]

Windbreaker, I have the same radio as you and a "Noob" when it comes to rc heli flying. A few things i noticed...

Spent alot of time with my throttle and pitch curves...

mine are
n1
th 0,48,68,82,100
pi 35,40,50,60,70
blade angles -2,2,4,6,9

gyro hh at +40%
expos at -25%

flys almost hands off and very easy to handle. Im fine now for any type of flight (no 3d yet) but maybe 1 day.:dontknow

[Windbreaker]

Thanks, Jeff.

I'll most likely want more docile handling. That's what your settings seem to indicate.

Dean .

[Pinecone]

I would bump the throttle curve for more headspeed. It will make the hover more steady.

I use: 0 - 60 - 80 - 90 - 100 in normal.

I also use 40 - 45 - 50 - 75 - 100 for the normal pitch curve to have the same pitch response above mid stick for normal and idle up. But your curve will make it easier to control since you have more stick movement for the pitch change.

I just hope you never need all the pitch range. As you are setup, you must be hovering near full stick, as you have only about 4 degrees max pitch, assuming a normal +/- 10 degree mechanical range.

[Logster1]

I am running the 6ex as well and am having a heck of a time setting negative pitch. My swash is set to 3-s and this is the 7th heli I have set up on Futaba gear, the second 450. Is there something special regarding this radio?

[istandalone]

because the channels are mixed (ccpm mixing), when you trim one stick all of the channels that are tied in will trim too. that's the biggest fallback of the 6ex series- no subtrim. subtrim will allow you to trim each servo separatley.

[NitroNoxious]

NO SUB-TRIMS ON 6EX 2.4, NOT A GOOD DEAL, UNLOADING MINE.

[DavidH]

NO SUB-TRIMS ON 6EX 2.4, NOT A GOOD DEAL, UNLOADING MINE.

What do you use subtrims to do? I have had radios that had subtrims for over 15 years now. I have never used the subtrims for anything.

David

[daijoubu]

For perfecting servo geometry independent of the mixing setup on the radio.

[DavidH]

For perfecting servo geometry independent of the mixing setup on the radio.

Never had a problem having perfect servo geometry and I have never used subtrim. That is what they make servo wheels for and a drill if nessecary. Even the servo horns and wheels have offset splines. So they can be setup on the output shaft of the servo in a perfect setting every time.

David

[daijoubu]

True, but there some people don't like servo wheels (me) because they require way too much work to fit their heli (Trex 500). With the 4 point wheel I can come close enough that I don't care. Having sub-trim would be nice, but I can work around it. Others are not very mechanically skilled and sub-trim makes their life better. You and I see the heli as a mechanical system with many adjustment points to tune the performance. Others see a black box to which they just add batteries. The T6EX is not for them as it lacks sub-trim.

[DavidH]

You and I see the heli as a mechanical system with many adjustment points to tune the performance. Others see a black box to which they just add batteries.

Yes and they have no use for subtrims either. Because they have no idea what they would be trying to accomplish by using them.

David