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Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar |
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03-23-2015, 06:31 PM | #1 (permalink) |
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Join Date: Feb 2011
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SHAKING HELI SYNDROME?
Hey guys, I think this particular question may have been asked already but i can't seem to find a definitive answer. my setup is a rush 750 with the sk540, protek servos with a dx7. my bell gain on ele/ail. is 50, my cyclic gain 50, dead band on ele./ail 2.5-3.0, cyclic accel 20, hiller decay 80. when I'm in IU1 or 2 while in a hover or at certain moves it will shudder left/right or forward/aft. if i just have it hovering and flick the cyclic like this the heli shudders just like the stick shudders. it also does it during flight. is there a setting that can stop this or is it something mechanically wrong?
Last edited by em3jefferson; 03-23-2015 at 06:41 PM.. Reason: can't figure out how to put in video. |
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03-23-2015, 07:42 PM | #2 (permalink) |
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Join Date: Feb 2012
Location: Chilliwack, British Columbia
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I would suggest atleast dropping your cyclic gain to 35 to 40 to start, 50 is pretty high for any model. I would also raise the Hiller decay to 130 to 150
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HELIDIRECT - HOBBYWING - XNOVA - XPERT - PULSE - ROTOR TECH |
03-23-2015, 08:17 PM | #3 (permalink) | |
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Join Date: Sep 2008
Location: Smyrna, GA
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Quote:
To start, what are the swash elevator and aileron cyclic setting numbers in the software on the swashplate tab? The best range mechanically is around 60% or so. Verify this is correct mechanically before trying to correct by changing the cyclic gains.
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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03-23-2015, 09:01 PM | #4 (permalink) |
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Thread Starter
Join Date: Feb 2011
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thanks for the replies gentlemen. ele. cyclic 54, ail. cyclic 54, collective pitch 38.
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03-23-2015, 09:10 PM | #5 (permalink) | |
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Join Date: Sep 2008
Location: Smyrna, GA
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Quote:
The other ones are a little low though, and indicate you are a little too far out on the swash servo horns and have too much mechanical gain. Move the swash servo balls in one hole and reset the head back up again. Your numbers will be higher then, but should be less than 65% which is good. Try flying it again starting with your gain at 50% as a starting point and adjust from there.
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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03-23-2015, 09:28 PM | #6 (permalink) |
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Thread Starter
Join Date: Feb 2011
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hey xrayted should I change all my servo horns out to the plastic ones. I currently am using the blue metal ones that come with the proteks, they only have 2 holes to use. there all in the holes closest to the center now.
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03-24-2015, 06:26 AM | #7 (permalink) |
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Join Date: Sep 2008
Location: Smyrna, GA
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You could try and see if it helps. You aren't really too far off in your numbers, so a couple things I forgot to mention you may want to check and do first.
Make sure there isn't any slop in any of the linkages anywhere on the head. The same holds true for the opposite........makes sure the swash links or any other head linkages aren't super tight and need sizing, as either of these could cause your symptoms. If all is well, you can try reducing the cyclic gain and see if the issue changes at all, and how low you would need to go to correct it, but too much and the heli will not feel right and must be adjusted mechanically at the servos to help further. What are you control rates?
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
03-24-2015, 07:09 AM | #8 (permalink) |
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Join Date: Mar 2012
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I have this same problem. I have the gains down to about nothing like in the 10 to 15% range. My swash setup is like 63 on elevator and aileron. I haven't figured out an answer yet either
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Team Jr Americas |
03-24-2015, 07:13 AM | #9 (permalink) | |
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Join Date: Sep 2008
Location: Smyrna, GA
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Quote:
Have you posted up your flight file for Omer or someone to look at yet? Unfortunately I'm on the road and don't have access to my PC software this week.
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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03-24-2015, 09:17 AM | #10 (permalink) |
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Join Date: Feb 2011
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I've had same problem after updating my SK-720BE firmware to 4.05. In previous configuration cyclic gain was 55, no hardware changes were made. I think new version has different algorithm for cyclic. Reducing cyclic gain to 49 almost cured shaking, so I stopped further decreasing gain, because weather was cold, and frozen pads transferred to FBL more vibrations than usual. I'm going to test heli again next week.
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03-24-2015, 09:30 AM | #11 (permalink) |
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Join Date: Mar 2012
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Servos are good jr 8717s so they are plenty fast. That and they worked fine with the vbar. I did upgrade it to 4.05 before I set it up. Can I revert it back to see if that was it? It is a 540 clear and I also upgraded to have the governor. I haven't looked fa the flight file haven't had time. Might tonite if I can figure out how to do it
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03-24-2015, 10:01 AM | #12 (permalink) | |
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Location: Smyrna, GA
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Quote:
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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03-24-2015, 11:51 AM | #13 (permalink) |
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Join Date: Dec 2009
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Are you guys with the shudderimg issue using the SK governer?
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Jose (Youtube -> Silverexpress01 See also Helifreak Blog) MCPx 76/7 | Trex 250 DFC 667/19 | Hurricane 200 FES 143/7 |
03-24-2015, 12:33 PM | #15 (permalink) |
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Join Date: Mar 2012
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I am and I have turned the gain down to about nothing and that didn't change the gov operation any. The motor is not holding steady at all. Now it is not sycronised with the head shake. The motor isn't holding on an even pace it is reving up and down at an evenly timed pace. The shuddering is like a tire out of balance on a car. Hammers hard quits and a few seconds later hammers hard quits and so on. But what everything acts like is when we change the gains nothing changes it is like the gains on the gov and gyro don't do anything. Maybe that is what is happening here
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03-24-2015, 01:20 PM | #16 (permalink) |
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Thread Starter
Join Date: Feb 2011
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hopefully we can get it figured out soon bro.
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03-24-2015, 01:39 PM | #17 (permalink) |
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Join Date: Mar 2012
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Well I always have my vbar to fall back on so it isn't like I am grounded. I would really like to get this working as I figure it will be a nice unit. I set a message to skookum hopefully they will reply soon or call me
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Team Jr Americas |
03-24-2015, 06:50 PM | #18 (permalink) |
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Would it be much trouble to swap out the SK? Doing so maybe we can rule out that it is mechanical. Or are you.guys certain it is the SK?
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Jose (Youtube -> Silverexpress01 See also Helifreak Blog) MCPx 76/7 | Trex 250 DFC 667/19 | Hurricane 200 FES 143/7 |
03-24-2015, 09:29 PM | #19 (permalink) |
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Join Date: Mar 2012
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It was flying good with the vbar. I have set up plenty of helis and I don't really have a problem with that. But I do think I figured it out what the problem is. Bad thing is it is raining and snowing now so I cant check it. Here is what I think is wrong. When I changed the gains on the swash I didn't use the slider and lock it. I just changed the travel adjustments in the radio. That should work and it does change it on the main skookum page but I am thinking that something isn't quite right here and it isn't really changing the gain. If I drop it 40% like I did it should at least change something in the way the heli flies. It isn't so I am going to click the lock gain in the cyclic page and try setting it like that. I don't know tho why the gain is not changing on the governor. No matter what the motor keeps hunting. It wont hold steady and I have tried gain from 50 down to 10 and it never changed it. Still the same as it was. I was hoping I missed something there but I am not finding that.
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Team Jr Americas |
03-25-2015, 08:15 AM | #20 (permalink) | |
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Join Date: Sep 2008
Location: Smyrna, GA
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Quote:
It depends on your channels scaling, so it's not always a exactly the same value as what your TX says, or you may see that something is wrong with your setup and its not changing at all. The other option is to just lock the gains in the software for testing so you know what you see is what you get. You also mentioned "slider bar" which sounds like you don't have your software in advanced mode and won't have access to all functions. Use the drop downs and change the interface to advanced. I can't help with the governor as I don't use it myself
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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