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HomeAircraftHelicopterFlybarless Rotor Head SystemsAlign 3G › Newbie on the block
10-11-2011 07:49 AM  6 years agoPost 1
jackheli

rrProfessor

Vancouver - Canada

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Hi guys,

couple of very basic questions... I just want to know if the techniques used to setup a flybarred heli are the same as for a flybarless. I am doing my first FBL with the 3GX.

So:

1- Ok to use subtrims? (within the same constraints as FB, of course)
2- Level the swash at neutral?
3- Level the swash at max and min collective pitch using end-points?

The question is: how much of this mechanical setup will the FBL do for you?

If the swash rises unleveled because of difference in cyclic servo tolerances, will the FBL command module correct it or better to setup the swash in the old fashion way, levelled throughout?

Or, in other words: if you correct the swash forcing it to rise levelled will the FBL command module interpret this as input and apply cyclic to move the heli?

Thanks.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-11-2011 09:06 AM  6 years agoPost 2
pani

rrApprentice

Athens, Hellas

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Hi Jack

1. Ok to use subtrims only when in DIR mode to level your swash. When flying it's ok to use trims but if you have to there is something wrong in your mechanical setup or excess vibes that upset the sensors.
2. Level the swash at half collective stick 50% pitch curve and 0 degrees
3. No. The 3GX does not need this neither do most of the FBL systems I have flown. Vbar has a feature to level the swash low and high but I did fly without doing it and I couldn't tell the difference when I did.

The FBL takes your inputs as rotation rates and translates them to the servos. It doesn't really care if there is a small incosistency in the servo travels.
FBL never rises the swash level because it inputs elevator correction all the time to cater for the boom aerodynamic drag. Vbar even lets you play with the elv precomp.

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10-11-2011 06:09 PM  6 years agoPost 3
jackheli

rrProfessor

Vancouver - Canada

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This is great info. I'm set!

Thanks Pani

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-12-2011 03:11 PM  6 years agoPost 4
lewma

rrApprentice

San Diego, CA

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Another piece of good information for new users is that the 3GX will appear to be totally dead until you plug in all servos and have a working receiver bound to the transmitter. I burned an hour last night trying to figure out why I had no lights whatsoever on the 3GX even though I had power applied to the unit. Turned out that I had all my servos connected apart from the aileron. As soon as I plugged it in, the unit came to life. Watch out for this. I was almost at the point of thinking I had a dead 3GX.

mark

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10-12-2011 07:37 PM  6 years agoPost 5
jackheli

rrProfessor

Vancouver - Canada

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Good point. I had a similar experience too.

Thx

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-13-2011 11:38 PM  6 years agoPost 6
lewma

rrApprentice

San Diego, CA

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Test Flight
Finally got a chance to test fly the 3GX in my 550e ( replaced the 3G that was in there ).

First flight, rock solid, just a little up elevator in the trim and it sat in a hover. No bobbling at all.

mark.

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10-14-2011 03:07 AM  6 years agoPost 7
Two Left Thumbs

rrKey Veteran

Houston, Texas - USA

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Great info Mark. I thought my 3GX was dead. Called the place where I got it, they agreed I should send it in for RMA. Then I tried it again, and it worked. The manual should point out this behavior, to the benefit of both the customers and resellers.

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10-14-2011 05:18 AM  6 years agoPost 8
lewma

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San Diego, CA

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I think it would be better for it to just light up the status LED red which could mean power is applied, yet not all servos are hooked up.

I too almost threw it back in the box to be shipped back. Glad I didn't. The unit works great.

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10-14-2011 06:40 PM  6 years agoPost 9
jackheli

rrProfessor

Vancouver - Canada

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All my electronics are hooked up so I'll try the setup of the 3GX tonight.

Maybe I'll manage to fly it on the weekend!

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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