Jello Help

[hipplew]

Hi All please could you spear the time and have a look at this video with regard to the Jello as I am now stumped the props and motors have all been balanced, I have the gimbal plate mounted to the frame plate with three metal spacers then rubber bushes holding that to the frame.

it's an S550 hex frame, emax mt 2213 with 10x4.5 props, HW 20A ESC, Naza m lite upgrade running off a 3s 2200mha, yes cheap eBay gimbal and a sj4000 clone camera running at 30fps@1080p

ANY THOUGHTS OR FEELINGS PLEASE SAY

Thanks
Howard

 

[GJH105775]

Is the camera and gimbal mounted using jello bubbles on the top or bottom of the quad? This is really a question as old as RC hahaha.

 

[hipplew]

Hi its mounted underneath and to the front then using the battery to balance here's a couple of pic's

 

[GJH105775]

Looks like you need to check for vibrations. What did you use to do that while you balanced your hubs? Smart phone or FCB?

 

[HDtallrider]

Have you tried moving your camera back out of the prop wash? Maybe check your prop balance again. Stand well away so your breathing doesn't effect it. I didn't see any balance tape on the motors. How did you balance them? I hate to say this but the motors sound like a threshing machine and they stutter. Have you checked the bearings? The stutter could be the ESC's breaking down. You're right though. Somethin's messin' up.

 

[ringolong]

The guys are correct. That jello is coming from the motors or props or a combination of both. One of the round rubber mounts looks loose too in your picture.

***At your own risk***
You could try holding the bottom while it is in the air and give it throttle. There should be no vibration at all. Softer dampeners will help too, but not too soft because then speed will cause jello since the gimbal will be easily blown around.

 

[GJH105775]

You have a few types of imbalance in your motor hubs, most common and easily fix is when one side is just a little heavier; just add tape in the right spot (divisions of 8 are usually accurate enough). The next has to do with the prop holder/adapter, as they can be bent, to fix this you usually just get a new one. The hardest is probably the bearing, if your bearings are causing the shake/vibration then you can change the bearings, but it is a bit of a job to get it out, once out you can use a bearing press or for motors this small a little vice or even tack hammer. Take props of to test if it is the motors, try without the motor adapter and then with the adapter.

http://www.itsqv.com/QVW/index.php?title=How_To_-_Motor_Balancing

This is a more complete guide, but as you have a KK2.1.x I can give you an easier way (no unmounting the motors and you can do it in place), if you have a KK and a flash tool get Stevie's 1.8, if not then get the iphone app he mentions and mound your motor to something like he did in the guide. You will hook the motor DIRECTLY to the receiver's throttle channel (usually 3) with NO PROPS and spin it up, you then try adding tape to the different sections, it should take you about 8 minutes or less per motor AFTER you have it setup, once you balance one try the tape in the same section on the other motors, as manufacturing defects are often consistent.

 

[HDtallrider]

The guys are correct. That jello is coming from the motors or props or a combination of both. One of the round rubber mounts looks loose too in your picture.

***At your own risk***
You could try holding the bottom while it is in the air and give it throttle. There should be no vibration at all. Softer dampeners will help too, but not too soft because then speed will cause jello since the gimbal will be easily blown around.

I agree on the vibration. I think it would be wise to systematically eliminate each possibility. If it were my quad I would first move the camera out of the line of fire from the prop wash.
hipplew, I swear there is something wrong with those motors. Although Emax is not the best, I have never heard them make that kind of noise before.
Anyway. I would check prop balance again after that. And double check that the motors are all mounted securely.
Oh Man!! I just noticed your camera is WiFi! That's 2.4ghz. I wonder if it's interfering and causing that stutter!? Do you have another camera that's not WiFi, or could you borrow one to see if that's an issue? Can you turn off the WiFi on that one and just record? You could download the video after you land and see if that was the problem. I sstill think you need to move the camera though.

 

[GJH105775]

I agree on the vibration. I think it would be wise to systematically eliminate each possibility. If it were my quad I would first move the camera out of the line of fire from the prop wash.
hipplew, I swear there is something wrong with those motors. Although Emax is not the best, I have never heard them make that kind of noise before.
Anyway. I would check prop balance again after that. And double check that the motors are all mounted securely.
Oh Man!! I just noticed your camera is WiFi! That's 2.4ghz. I wonder if it's interfering and causing that stutter!? Do you have another camera that's not WiFi, or could you borrow one to see if that's an issue? Can you turn off the WiFi on that one and just record? You could download the video after you land and see if that was the problem. I sstill think you need to move the camera though.

The camera probably records on the quad instead of after sending the signal, even then 802.11 standards are pretty resilient against RFI, but it REALLY sounds like a problem in the bearings, a loose screw on an unbalanced motor can sound the same, but it sounds terrible hahaa. I am afraid that even if you switched the camera and that fixed it, it would not be definitive, could just as easily be the sensor working different.

 

[HDtallrider]

The camera probably records on the quad instead of after sending the signal, even then 802.11 standards are pretty resilient against RFI, but it REALLY sounds like a problem in the bearings, a loose screw on an unbalanced motor can sound the same, but it sounds terrible hahaa. I am afraid that even if you switched the camera and that fixed it, it would not be definitive, could just as easily be the sensor working different.

Nuts! I thought I had it. Still need to move the camera.

 

[hipplew]

OK Thanks for all the advise will start to look at what you all have mentioned while the camera is wifi it's not on as for the motors four are from a quad that I had the other two were bought separately and by chance don't have a CE mark on them !!!! any one heard of cloned Emax motors??????? oh and they are the front two

 

[HDtallrider]

Hmmmm. You may have found your problem. Swap them to the back and see if that helps. I have never heard of cloned Emax motors. Clones are usually of upper end products. If they are clones, it just shows how bad the Chinese economy really is and how desperate they are. I hope it's not the case.
Be careful out there.......

 

[GJH105775]

Hmmmm. You may have found your problem. Swap them to the back and see if that helps. I have never heard of cloned Emax motors. Clones are usually of upper end products. If they are clones, it just shows how bad the Chinese economy really is and how desperate they are. I hope it's not the case.
Be careful out there.......

Worse than Emax? I'd suggest you don't have two of those in a row hahah That way if/when one(or two) fails then you still have a chance at bringing your hex down. Next time you buy you are probably going to want to get some better motors hahaha.

 

[hipplew]

haha already thinking of that but what's out there that wont break the bank and get the wife wound up

 

[HDtallrider]

My opinion for best bang for the buck in affordable power systems are SunnySky motors, ZTW Spider opto ESC's and Castle Creations UBEC. Perform beyond their price point. You won't have to service the bearings for 40 hours or more and the ESC's require no programming. Plug and play, and operate at 600hz. My advice is to not throw good money after bad by bottom feeding again. You'll be much happier with good stuff.

 

[HDtallrider]

Hey hipplew. To put this advice in context. Almost every member on the forum who builds their own multis has done EXACTLY what you did. It's a learning process for sure. My first $225 to $250 build ended up well over $600 after replacing all the junk I bought first and replacing it with good stuff. Looks like you only have to worry about motors and ESC's. We've all been seduced by the Dark Side at one time or another. Do not despair, young Padiwan. The Forum is with you! Hahahahaaaa!

 

[ArmyVet]

Sort of Hi Jacking this old thread

I searched "jello" and got seven pages of results (too much to view) and this one was the only one with "jello in the title.

I did learn a lot from this thread. Trying to clarify in my rookie mind what causes Jello.

Vibration seems like a big culprit.

In order of importance, what has the most affect on having jello or not?

Camera quality?
Gimbal/vibration mount?
Quad Vibration?
Quad Motion?
Something else?

Example: If I had a low end camera and everything else was top quality and a non contributor. Would I still have Jello??

Thanks in advance.

Bill

 

[ringolong]

A camera will not cause jello.

Props and motors not being balanced are what cause jello. Balance those two, and you will eliminate jello.

 

[ArmyVet]

A camera will not cause jello.

Props and motors not being balanced are what cause jello. Balance those two, and you will eliminate jello.

Thanks, That cures at least one misconception for me. Interesting.