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Thunder Tiger GT5 FBL System Thunder Tiger GT5 Flybarless Electronics |
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12-30-2011, 06:56 AM | #1 (permalink) |
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Join Date: Apr 2008
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Cyclic bounce
I've finally got a few flights in on my TRex 500EFL Pro with the GT5. Maidened it with all settings at default and it flew reasonably well, but felt a little bit soft and not quite as locked in as I would like. I followed Swalko's tuning guide and after three packs of adjusting settings it now feels really great. (I have a Beast X sitting on the shelf and don't feel the urge to swap it for the GT5). The only thing I still need to tune out is an elevator/aileron bounce on hard cyclic stops. I tried various settings for D-Sense but didn't manage to get rid of the bounce. Possibly I missed the sweet spot because I was changing it by reasonably large amounts (about 10 at a time) but I tried quite a few values from about 20 up to about 70. Anyone got any ideas what I should try?
Apart from that I really love the way it flies. Very fast cyclic rates (which may also be to do with the high headspeed of the 500EFL), very stable and a great feel to the tail. |
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12-30-2011, 11:10 AM | #2 (permalink) |
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Join Date: Jun 2011
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Are you using a full Rx as a failsafe?
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12-30-2011, 03:01 PM | #3 (permalink) |
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Turn down IDStick to 90. What is your feed forward set at?
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CustomHeliParts/KDE TRex 700N ThunderTiger X50 FBL Ely.Q Vision 90 Ely.Q Vision 50 |
12-30-2011, 10:23 PM | #4 (permalink) | |
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01-02-2012, 02:14 PM | #5 (permalink) |
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Here are the settings that I am running:
P 120 I 100 I-D-stick 100 D-sense 50 (various values tried) Feed Forward 85 I-lim 18 Hover stability 5 It was quite windy when I did my first tuning flights so maybe I ended up making P and I higher than they really needed to be as it was harder to tell when I got to the point of flips/rolls being really nice and consistent. I think maybe I will experiment with lowering I-D-stick a little bit and then try changing D-Sense by smaller amounts and see if that helps. I will also probably try lowering the hover stability back to the default 3 (I initially raised it because the heli was a bit sloppy/unstable but this was before I raised P and I which cured that problem all together. No idea whether this will have any effect on the bounce issue though.) |
01-02-2012, 05:16 PM | #6 (permalink) | |
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Join Date: Aug 2009
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Quote:
P/I/D-Sense: 100/83/25 Hover: 4 I-D-Stick: 100 If your heli will fly good with my settings, but controls feels little undefined, raise your total gain in TX by 20%. Try it and report. |
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01-02-2012, 05:47 PM | #7 (permalink) | |
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01-03-2012, 12:00 AM | #8 (permalink) |
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Yes, up to 149. I use 115/100/85 total gain.
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01-08-2012, 10:23 AM | #9 (permalink) |
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Join Date: Mar 2008
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Loaded up those numbers on my 500esp,we will see how it.goes,it was feeling a bit loose in the wind yesterday,hope they work well
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Trex 500 12s vbar I2 bling Furion 600 12s vbar I2 bling trex 700edl vbar 12s I2 bling Tdrex 800e 12s vbar I2 bling Bank account EMPTY |
01-23-2012, 12:27 PM | #10 (permalink) |
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I tried the new settings today and it didn't cure the cyclic bounce problem unfortunately. It's kind of hard to say because it's about 3 weeks since I flew this heli but I think possibly it flew slightly better with my previous settings (not due to the bounce, but it maybe just had a generally more consistent and controlled feel to rolls/flips etc.). The cyclic bounce is only on elevator by the way, not on aileron.
So I guess it's back to the drawing board. |
01-23-2012, 08:34 PM | #11 (permalink) |
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Join Date: Mar 2008
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Maybe you have a issue with your unit,I had to send mine back for a elevator drift that wouldn't go away.
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Trex 500 12s vbar I2 bling Furion 600 12s vbar I2 bling trex 700edl vbar 12s I2 bling Tdrex 800e 12s vbar I2 bling Bank account EMPTY |
01-24-2012, 02:22 AM | #13 (permalink) |
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I used the settings posted here,the unit just started drifting on ele.they use double sided tape inside the case to secure the unit,could have came loose.
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Trex 500 12s vbar I2 bling Furion 600 12s vbar I2 bling trex 700edl vbar 12s I2 bling Tdrex 800e 12s vbar I2 bling Bank account EMPTY |
01-24-2012, 02:30 AM | #15 (permalink) |
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So have you now got a replacement unit that is working well? What kind of flying are you doing? My flight style is sport/aerobatics and I can quite happily fly circuits, some loops etc and see no sign of the bounce and it does fly very well. It's when the heli is in a hover and I give a deliberately hard jab to full elevator and then go straight back to neutral, that the heli will wobble/bounce.
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01-24-2012, 02:33 AM | #16 (permalink) | |
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01-24-2012, 02:38 AM | #17 (permalink) |
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Certainly for just flying circuits, it flies perfectly. It flips/rolls nicely it's just on quite hard stops from an elevator flip. On tic tocs it is fine as well.
I didn't get this bounce at all though when I had a Beast X on my 500ESP or 700N and whilst I can happily fly like this, I would still like to get rid of the bounce. |
01-24-2012, 02:46 AM | #18 (permalink) | |
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01-24-2012, 02:48 AM | #19 (permalink) | |
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