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Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar |
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10-06-2014, 08:53 PM | #1 (permalink) |
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Join Date: Nov 2013
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This elevator jiggle I've been chasing.......
Okay I can see it on the bench exactly the symptom that I'm trying to tune out. So here is what you do, put your heli on the bench boot it up and give an authoritative but not crazy elevator input forwards or backwards and release quickly. Watch the way the swash stops at the end of the input and moves back to neutral, there is a little "jiggle" for lack of a better word its not a smooth stop and return.
Now do the same thing for aileron left or right input. You see its very smooth doesnt have that jiggle at the stop and return moment of direction change. This is exactly seen in flight which causes the boom to do a "jiggle" on elevator jabs. I can't seem to tune it out in the software which leads me to believe this is the nature of the elevator control. Opinions ? Interestingly, I noticed some flybarless helis in realflight 7 also do this, some flybarless helis do not. I'd love to get rid of that jiggle but maybe its meant to be countering something different. |
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10-06-2014, 09:13 PM | #2 (permalink) |
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Join Date: Jul 2014
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I had the same problem. Turned the software inside out tuning and retuning to try to get rid of it. It ended up being several things. I had servo slop and it was doing the racketing effect so I put a new servo in. Then the servo mount was flexing a little bit so I used an alloy mount. I then used a little higher headspeed and new dampers and totally gone. But not to say this is what is your case. But this can at least give u some ideas what to look for. It's not gonna hurt anything just an annoyance really. As long as it's minimal
Last edited by Inkslinginmofo77; 10-06-2014 at 10:17 PM.. |
10-06-2014, 10:01 PM | #3 (permalink) |
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I have the same thing with an Atom 5.5 and Goblin 500.
Can't seem to get rid of it. Does not affect flight though... Both are running hyperion servos that are showing some slop in the gear train. I get a jiggle in the heli when carrying it out to the field to fly as well.
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Jeti DS-16, Oxy 3, Goblin 380, 500, 630, and 700 competition, Airwolf 600 scale heli, Brain/Ikon 2, Spartan VX1e, Sk 720, YGE and Hobbywing. |
10-06-2014, 11:07 PM | #4 (permalink) |
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Thread Starter
Join Date: Nov 2013
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With all due respect .... Don't start the covering up doo doo with me !! My Vbar and BeastX did not do such a thing to be that noticable. Same machine same electronics. I just finished setting up my 770 comp with brand new trillion dollar jr servos a machine that has never left the ground and it does that effect even much more noticable and nasty cause those servos are so exact. Thats my second sk Black on my 770 comp.
Its 100% skookum generated. Thats not to say its a fault, I have two blacks that are doing it, on two goblins different sizes, on different servos. I just want to know what it is why it does it. It seems overcomplicated to me. Why not just let the elevator move smoothly like aileron does. |
10-07-2014, 12:44 AM | #5 (permalink) |
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Join Date: Jul 2014
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U could either try dampers or play with your bell gains and dead bands
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10-07-2014, 04:39 AM | #6 (permalink) |
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Join Date: Aug 2010
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Neither worked on my E5. If I lower my bell gains any more I might as well give an input and come back a min later to see if it did what I said.
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B400(retired),Mini Titan V1(Retired),Radikal G20 (scrapped),Align T-Rex 500pro DFC,Synergy E5s |
10-07-2014, 10:35 AM | #7 (permalink) |
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Thread Starter
Join Date: Nov 2013
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Hey I'm not a good pilot, I'm a text book beginner but that phenomenom for lack of a better word is something I noticed immediately and I don't like it.
But I do believe its part of a bigger equation, overall the heli feels okay, but that kind of sticks out at you from time to time. Obviously the elevator motions are going to have to be different from aileron as it has to yank the tail boom up and down as you apply elevator where as aileron is a roll along the length its very obviously seen on the bench and in the air. I just wish someone knew about this stuff or it was documented. I'm thinking this is hiller gain related or maybe similar to paddle simulation stuff from vbar. I'm curious the videos from Gaui NX7 releases all showing off 540 Red's. Is that a better "flying" controller ? |
10-07-2014, 01:38 PM | #8 (permalink) |
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There is definitely a "jiggle" since version 4 but it has been pronounced on only 2 helis in the fleet to a significant degree.
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Jeti DS-16, Oxy 3, Goblin 380, 500, 630, and 700 competition, Airwolf 600 scale heli, Brain/Ikon 2, Spartan VX1e, Sk 720, YGE and Hobbywing. |
10-07-2014, 01:53 PM | #9 (permalink) |
Join Date: Mar 2007
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=] you have a flight log with these jitters?
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10-07-2014, 01:56 PM | #10 (permalink) |
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Join Date: Jan 2008
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The physics of controlling a heli in the aileron axis are different from the physics in the elevator axis, so any decent control system takes a different approach. And on the ground, the system isn't seeing the response it expects.
As to it being different from other gyros - we aren't trying to clone them! |
10-07-2014, 02:08 PM | #11 (permalink) |
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Thread Starter
Join Date: Nov 2013
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Hey thanks for the reply ! But in the air the motion of the heli is representative of what you are seeing on the bench that the swash is doing. Can you elaborate ? What is the intention behind the way the elevator is behaving.
So how can we tone down this effect in the elevator which causes the boom to jiggle on firm elevator inputs and stops. |
10-07-2014, 02:10 PM | #12 (permalink) |
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Join Date: Nov 2013
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I will do you better than that, I will take a flight log, and a quick video demonstrating what I'm talking about, both on the bench and in the air. What you see the swash do on the bench the heli does the same thing in the air. Maybe you can help me iron it out |
10-07-2014, 02:18 PM | #13 (permalink) |
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Join Date: Dec 2013
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The parameter that I have found out to control the amount of ele jiggle is the cyclic accel. I was having the same issue. If you lower cyclic accel to around 10 or lower you will notice the swash jiggle will no longer be there but then the swash will be sluggish so to counter act that I just use a really high bell gain. works for me
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