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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsAlign 3G › V2.0 - DIR mode Uneven swash at full positive and Negative pitch.
03-31-2012 06:58 AM  7 years ago
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Malc1

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EVESHAM,UK

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V2.0 - DIR mode Uneven swash at full positive and Negative pitch.
I'm in the middle of setting up my 3GX V 2.0 after upgrading from a 3G on my 700e.

Even though everything is at 90 degrees,even and the swash level at centre stick it goes out of level at full positive and full negative collective.

All control rods are 100% the same length.

What this means for me is, as I'm trying to set up my +- 12 degrees of collective pitch it ends up being about 0.5-0.75 degree difference between full stick and low stick.

You can see at High and Low stick that the swash has gone very slightly off level.
If it was levelled here the range would end up being evened out.

Do I just leave this how it is and only go by my + pitch reading to set this up correctly.
I believe end point adjustment is a no go - if this did anything.
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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03-31-2012 11:38 AM  7 years ago
coolice

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Northamptonshire, England

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Hey.

How much sub trim have you had to use to level the swashplate, or none at all? If you are using a small amount of sub trim, depending on your transmitter it may not be allowing for this in the overall travel range of that channel. In turn reducing the control steps on one side.

Normally as you know any differences in upper and lower pitch readings are through the servo arms not being entirely level to one another, the elevator arm could be slightly off for instance and lower the swashplate the small amount you are seeing.
I take it you have checked that tthe model is level in all planes? I pop my bubble level on the boom or skid tube, assuming I have the blade to check pitch out to one side.

Yes, adjusting your ATV's with the 3G/GX's is not recommended. Some have done it without problems, but I wouldn't advise doing so.

There is a discrepency in the setup at mid stick I'd say causing the mismatch. However at these small values and I am guessing you're using a digital pitch gauge which will show them, I'd not be too worried.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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03-31-2012 01:44 PM  7 years ago
Malc1

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I'm using a JR DSX9 and yeah as you guessed I'm using a digital pitch gauge.

All three cyclic servos have subtrim.A couple of channels have 16 points and the other has 22 points.Nothing really.

Regarding having the heli level.
I just put the digital gauge on the boom and reset it to give me a zero point.
Across the frames near the bearing block and zeroed for the cyclic.

All the control arms look 100% but I suppose I could recheck the models level, reset the trims back to zero and start again to see if anything changes.

Its not out a lot but using the digital gauge does show you things.

I wanted the initial bit to be as good as I can get it.

Maybe I could move the servos around on the splines 1 click to lower the swash a tiny amount and try again.
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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03-31-2012 09:11 PM  7 years ago
coolice

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Hi Mate.

I saw this today on another 700E, but the collective was out top and bottom by 3+ degree's. On this model the guy had not levelled the arms quite right and the rear elevator arm was out to, so while the mid stick position was good, the inaccuracys showed at the extreme's of collective travel.

For me sub trim is a bad word it has it's benefits, but I've always felt the 3G/GX flies better with none and strive to not have to use any. On the 700E with servo wheels it's much easier to keep rotating the wheel until the disk lines up with no sub trim used. Other models using single arm horns can be more of a problem, but swapping and changing them around has allowed me to only need sub trim on one servo normally.

It's worth taking the time on the bench buddy, the final result in the flying will be worth it.

Keep me posted.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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03-31-2012 09:17 PM  7 years ago
Malc1

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Going to go through everything again and recheck.

Regarding checking the collective pitch range the instructions seem to state that the blades need to be along the boom (as if checking cyclic pitch).
Is this right or does it not matter?
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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03-31-2012 09:34 PM  7 years ago
coolice

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Hey.

Yeah it will be worthwhile.

Myself I set the pitch with the blade pointing out to one side of the model and then level the model using a bubble level on the boom. Seems to work well for the 3GX system, I then level across the model when setting the aileron pitch values.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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03-31-2012 09:45 PM  7 years ago
Malc1

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EVESHAM,UK

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Same here,normally I check the collective with the blades across the heli and I then level across the model for the cyclic.Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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04-02-2012 01:16 PM  7 years ago
Malc1

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I've gone through the settings from the start a couple of times and all is now looking much better.
Starting afresh seemed to work - not quite 100% according to the digital pitch gauge but close enough.

Just doing the final bits later and then I'll test it out.
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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04-02-2012 07:49 PM  7 years ago
coolice

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Hey Buddy.

Ah, great news. Yeah sometimes a complete reset and starting from the beginning again gets rid of any slight inaccuracys, which can lead to problems. Some units may mask these, but the Align offerings do seem to benefit from a good bench setup to start with.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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04-02-2012 08:47 PM  7 years ago
Malc1

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Thanks Ian

One more thing...

I'm playing with the flight mode settings adjusting the aileron and elevator end points.

Am I only adjusting max travel looking for binding in a straight direction?

What about binding at the extreme stick positions ie the corners - which I get using the default 70%?
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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04-02-2012 10:22 PM  7 years ago
coolice

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Hey.

You're welcome buddy, glad to try and help.

To my knowledge you only adjust the travel limits to stop binding while giving pure aileron or elevator inputs and not by putting the sticks in the corners. Having not tried V2 myself I cannot comment on if the unit then allows for a virtual cyclic ring to stop binding happening.
Reading the setup instructions it seems to recommend around 70% travel limit, which you are at and seeing binding in the corners. As I'm sure you won't hit the corners I'd be inclined to go with it as it is now. I do wonder if you could use the transmitters E-Ring function now that DIR is setup correctly, as this would limit travel in the corners only.
If you wanted to play it safe, you could knock the travel limits down to 65% and that would not impact performance much, if at all, but would safe guard the corners.

I'm keen to hear your thoughts on V2, as a club flier tried it on his 700E and it didn't seem to feel very good. However, there was setup errors in the bench stages which the owner is going to put right.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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04-02-2012 10:46 PM  7 years ago
Malc1

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OK will do it as per the book.

Hopefully I can try it out at the weekend - weather permitting.

Going to be interesting, as well the 3GX I have also installed a KDE 700XF motor and CC HV160v2 ESC to try.

This is my original heli that did have a 3G fitted along with a 700M motor and CC80HV.
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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04-09-2012 06:30 PM  7 years ago
JuanRodriguez

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The Villages, Florida

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Any progress report ??Been there, done that and old enough to know better.....
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04-09-2012 07:38 PM  7 years ago
Malc1

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EVESHAM,UK

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No not yet.

The weather here has been hopeless.
Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max
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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsAlign 3G › V2.0 - DIR mode Uneven swash at full positive and Negative pitch.
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