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04-30-2014, 09:42 PM | #21 (permalink) |
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I recently had the same tilting issue and after testing it with blades off, it still tilted. I've seen many-a-3GX do the same thing but when lifted off, it was fine so I put the blades back on and fired her up and i saw the disc start to slightly tilt and I just increased throttle and she popped right up with no issues.
The only vibes on my machine are from the OS .91 as I recently re-built it (re-kit) with all new parts (shafts, blades, gears, bearings, etc...)
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04-30-2014, 10:03 PM | #22 (permalink) |
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Join Date: Mar 2012
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I had the same swash plate tilt issue on my new 700E v2 3GX with version 4.0 firmware. I reset up and ran with the main and tail blades removed. Each time when spooling up the swash would tilt forward and left. My 550E with firmware 3.1 flies fine so i reverted the 700E to v 3.1 and redid the DIR set up and the tilt issue went away. My 3GX came with v1.2 firmware originally.
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05-11-2014, 07:52 PM | #23 (permalink) |
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Join Date: Apr 2014
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I have the following new information to add. This is probably not related to the original swashplate tilt problem but it gives the same symptom.
Today, the swashplate tilt problem came back again. I was frustrated. After trying a few things and still could not get it to work, the pitch of my main blades also got out of order. I was gettting something like -20 + 5. I examined all mechanical setting again. I did the DIR setting again. I could not find anyhting. At last, I found that the Jesus bolt was broken. The problem was so cleverly concealed such that the head and tail of the bolt was still attached on the outside but it was broken inside. After fixing that Jesus bolt, everything became normal again. So, I think the reason for the swashplate tilt today was that the Jesus bolt became weakened and bent. The roter head geometry was altered. Then the bolt was broken completely at the end. So, I found another possible cause for swashplate tilt. |
05-12-2014, 12:05 PM | #24 (permalink) |
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Join Date: Jul 2010
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Re: My 3GX causes swashplate to tilt forward left
The more causes and solutions the better off everyone will be.
sent from a non Apple device
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05-13-2014, 08:29 AM | #25 (permalink) | |
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Join Date: Apr 2014
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Quote:
Other flybarless systems I used before are not so temperamental. |
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05-13-2014, 10:19 AM | #26 (permalink) |
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Join Date: Nov 2011
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I'm not sure any FBL unit will fix the broken Jesus bolt....
Some FBL units are more forgiving with vibration and some not. Find the cause of vibration and fix it. Vibration and less than optimal mechanical set up will bite you hard on any FBL units. One of the reason why I don't trust bail out functionality on Skookum, Brain, and Hellicommand, after very costly crashes due to vibration. Last edited by nameci; 05-13-2014 at 12:42 PM.. |
05-13-2014, 05:02 PM | #27 (permalink) |
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Join Date: Apr 2014
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Nameci, you are right. No FBL system will fix borken Jesus bolt. But some FBL will confuse the pilot more with so many variables and unpredictability like the 3GX. Note that in my last reported incidence, my theory is that the "bent" Jesus bolt (before it was broken) caused the swashplate tilt to happen. When it was actually borken, the symtom was not swashplate tilt. I think other units like the BeastX probably would behave better in such situations.
We discussed so many things in this thread and other people discussed tons of more issues in other threads too. I have not documented all my dissatisfactions with this unit in this thread. If my only problem with this FBL combination is the Jesus bolt, I would be very happy with it. I have no time to waste on it. I have decided that replacing the 3GX with something else is the best option for me. I used to use the cheap ZYX-S for a while. It was not perfect but consistent. I am going to give the ZYX-S2 a try. Only 40 bucks. |
05-14-2014, 09:02 AM | #28 (permalink) |
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Join Date: Nov 2011
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After living with many different FBL units(I have tried pretty much every single FBL units out there over last few years and still own multiples of many different FBL units), there is no one FBL unit that is trust worthy IMHO. They all have different weaknesses and strengths. Additionally, there are issues caused by many different combinations. On FBL units, mainly is caused by vibration(I thought many of my helis were vibration free until I put on Vbar or Skookum where you can see the unit sensing the vibration on the PC software/log). It was eye opening). Any less than ideal mechanical set up, bad blades, poor blade tracking, slightly bent head/tail parts and shafts, notchy bearings(including motor bearings), poor TT gears/main gears, poor quality pinions, broken screws will cause vibration.
And next biggest problem is the familiarity of the FBL unit set up and mechanical set up. On some units, every flight becomes tuning flight. You just have to pick whichever FBL unit you are comfortable and spend time with it. From what I see, you are using 3GX on HK450. I would strongly suggest replacing all the shafts/bearings and important screws on HK450. I have built many different 450s(including two HK450s). Every clone 250/450's I have built, I had to replace pretty much all the drive train/gears/shafts and the screws(they bent/break w/o notice). It ended up costing more than Align 250/450 and still was not happy with them. |
05-14-2014, 10:23 AM | #29 (permalink) | |
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Join Date: Jul 2010
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Re: My 3GX causes swashplate to tilt forward left
Quote:
sent from a non Apple device
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05-14-2014, 09:26 PM | #30 (permalink) |
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Join Date: Apr 2014
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Exactly - we came to the same conclusion. There are enough problems with the heli without adding issues from the 3GX. Remove it and get fewer issues. Simple.
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05-23-2014, 09:41 PM | #31 (permalink) |
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Join Date: Apr 2014
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Final post
Hi,
I feel obliged to report to all of you my test with the ZYX S2 after having received it and done a few test flights. This post is not a discussion of the 3GX. I used the ZYX S before and had good impression of it at that time. I had one particular problem with it but it was probably just a bad unit. The ZYX S2 is very impressive. The set up is very easy. The few test flights I had were very smooth. Using the same heli that I was struggling with the 3GX, I have not a single issue. Take off was as easy as giving the stick a push. I don't have to worry about swashplate tilt or any other unpredictable behaviours. I even feel that the thottle control is much more linear than before using the ZYX S2. It is also probably one of the cheapest FBL control unnits (if not actually the cheapest) I am so happy with ZYX S2 that I think it deserves a praise in this thread. |
06-01-2014, 10:56 AM | #32 (permalink) |
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Join Date: Aug 2012
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mine does it on the bench with throttle hold on so there is no vibration. the old 3gx was doing this so I replaced all servos and 3gx. It still is doing it.
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I didn't crash. I just ran out of airspeed, altitude, and idea's all at the same time. |
06-01-2014, 02:00 PM | #33 (permalink) |
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Join Date: Jul 2010
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Re: My 3GX causes swashplate to tilt forward left
So you power the electronics, and the swash tilts?
sent from a non Apple device
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The more I know, the more I know I don't know. |
06-01-2014, 05:46 PM | #34 (permalink) |
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Join Date: Aug 2012
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It would do it with throttle hold on. move throttle stick past half and let go, it would move forward and left. I changed all servos and 3gx. I even changed the reciever. I ended up clearing that model out of the transmitter and re-installing. Problem went away. Now I have a spare 3gx.
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I didn't crash. I just ran out of airspeed, altitude, and idea's all at the same time. |
06-01-2014, 05:57 PM | #35 (permalink) |
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Join Date: Apr 2012
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Just to add to this thread- I've just had a similar issue but with swash tilting in failsafe.
When I turned the Tx off to check the failsafe (blades off ), the swash would tilt right. Strange thing, is it wouldn't do it when flicking throttle hold from any flight mode though, which ruled out vibes. Did a rebind and issue resolved. |
06-01-2014, 11:53 PM | #36 (permalink) | |
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Join Date: Jul 2010
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Re: My 3GX causes swashplate to tilt forward left
Quote:
Thanks! sent from a non Apple device
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