I have a mobula8 (actually a bassline rebuilt onto a mobula8 frame) and I find I get a bit of jello in the video feed. It's not terrible, and doesn't affect flying too badly, but it does grate on the eyes when watching the footage afterwards. I had similar jello when the components were on the bassline frame too.

I've put new props on to see if that helps (no real difference), and also pulled the bell housings off each motor to check for debris/damage (none found). I've spun up each motor without a prop and noticed that 2 spin smoothly and quitely and the other 2 sound a little harsher and I'm feeling vibration from them as well as seeing it on the FC accelerometer graphs in Betaflight. Coincidentally or otherwise it's the 2 CW spinning motors that give the vibration. It doesn't seem to obviously affect flight performance, but then I'm maybe still a bit new to FPV flying to know what it would look like if it was affecting it.

Is there any obvious fix for this? I could try replacing the motors and hope the new ones are better balanced, or could potentially head down the route of fitting some vibration damping somewhere between the motor and the camera - on the Mobula8 the motors and camera are basically hard-mounted to the same frame with no isolation. The FC does sit on rubber mounts though.

That's a bit odd as I have 2 Mobula8 and a Bassline they all have very little or no jello issues at all, and they are HD Walksnail units, and HD cameras really do show jello if there is any.




A couple of things to try, loosen the screws just a little on the flight controller, and make sure that the flight controller does not touch the frame -- I actually had the issue of VTX wires touching one of the whoop hoops, and I carved just a bit out of the frame as in this post https://intofpv.com/t-walksnail-mobula8-...#pid213536

It's the WS HD vtx that I have and it basically spoils any footage for viewing later. I did a few more tests spooling up motors and it does seem to be coming from the CW spinning pair of motors, with it being especially noticable at certain RPM, where it hits resonant frequencies. I had to do some elaborate frame trimming to get the motor plugs accessible. On the bassline AIO board the plugs come out the side, whereas the mobula8 plugs come out the underside of the board. I checked all these cutouts to make sure the board and components isn't pressing against the frame.

I'm wondering if a few layers of electrical tape between the motors and frame might help. It's not the perfect solution, but may help...

Update: I've just tried sticking 3 layers of electrical tape between the 2 buzzy motors and the frame and it has made a BIG difference. Jello is nearly completely gone, even when reviewed on my PC afterwards. It's maybe not 100% but it's good enough for now.

Scro, what was the reason for you change the Bassline into a Mobula8?

With my Mobula8 I have swapped from a Props out configuration to a Props in configuration, I just found that they handle better with a Props in configuration

Wanting prop guards was the main reason for the change. I want to practice more "low and slow" flying rather than full out ripping through wide open spaces and felt the mobula frame was better suited for that. The Bassline was a lot of fun and flew really well.

Interesting comment about the prop direction! All my previous quads have come configured as props in, but the bassline was configured props out. Might have to try switching and give it a try.

The Bassline sure is fun, the only thing that I don't like is the F415 AIO that it has no blackbox, meaning that there is no Gyro Data for Gyroflow, where is the BNF Moubula8 comes with the a F405 AIO that has more UARTS and comes with blackbox. I would really like to see Happymodel sell a BNF Bassline Ver2 with the F405 board along with a bit of a clean up of clearances of plugs to frame etc, with a little better quality control.

With my Mobula8s they are super fun and every good for proximity flying, as well doing flips and rolls, and is my most flown quads.

I've got the standard Bassline AIO which doesn't have the extra niceties. Looking at the specs for the HD mobula8 it looks as if it has a barometer as well as blackbox?! I'd originally thought to get a mob8 but they were out of stock, so got a bassline instead.

At risk of heading off topic a bit, I find that using Gyroflow's auto synchronisation feature you can get the equivalent of gyro data generated from motion analysis of your footage. I've successfully used that for stabilising footage from my bassline-mobula8 hybrid.

(17-May-2024, 07:04 PM)Scro Wrote: It's the WS HD vtx that I have and it basically spoils any footage for viewing later. I did a few more tests spooling up motors and it does seem to be coming from the CW spinning pair of motors, with it being especially noticable at certain RPM, where it hits resonant frequencies. I had to do some elaborate frame trimming to get the motor plugs accessible. On the bassline AIO board the plugs come out the side, whereas the mobula8 plugs come out the underside of the board. I checked all these cutouts to make sure the board and components isn't pressing against the frame.

I'm wondering if a few layers of electrical tape between the motors and frame might help. It's not the perfect solution, but may help...

Update: I've just tried sticking 3 layers of electrical tape between the 2 buzzy motors and the frame and it has made a BIG difference. Jello is nearly completely gone, even when reviewed on my PC afterwards. It's maybe not 100% but it's good enough for now.

I have a Mobula8 WS with the same problem, no matter what i do, theres always jello...
I will try the to stick some layers of electrical tape between the motors and frame, hopefully it fixes that.
How much did you tighten the motors screws?

Hmm might be able to help showing the settings that I have used with my WS Mobula8, I will go through the settings, versions of Betaflight and Bluejay and the settings that I have used.

Tonight go through some of footage, off my WS Mobula8 maybe tonight or tomorrow and put a link and see if that I get is acceptable, I will post screen shots of my settings and see if it can make a difference to your Mobula8 -- of course anything you try as learnt from me is all at your own risk   I am pretty good at blowing things up. 

Quick questions:

• what version of Betaflight are you currently using?
  
• what version of Bluejay are you using   is the the 96MHz or 48Mz?
  
• Are you running the stock HappyModel setup? 
  
• Is this BNF version or some custom build setup?
  

Thanks.

My Mobula8 WS:
Betaflight 4.4.3
Bluejay 48Khz
Stock setup
BNF version
Tattu 450/550 2s battery
Replaced the vtx once, the old one died when i crashed into deep snow few months ago

Cool just about similar firmware and software versions, -- nice battery -- I think I may be running Bluejay in 96Mhz, I will need to check.
 
Thinking of the best way forward, I will start sharing configuration info and screenshots tonight --  I will now share a quick video output, as see what people think, as this could be an expectation thing. Yesterday I checked my 8GB VTX storage, and as I had only 4 videos on the VTX, as it's only a 8GB VTX that overwrites the videos as the storage fills up. The Video as follows is a snip of one of videos retrieved off the VTX Yesterday,
My quick workflow:

• Save to PC from the VTX
  
• Process by Gyroflow with gyro data from flight controller - Using very slight stabilization 
  
• Using corresponding, osd and srt files from goggles processed through "Walksnail OSD Tool"
  
• Practice upscaling and colour grading through Davinci (I did not get this part quite right but it's Jello that we are discussing and I am new to Davinci)  
  

You're video is very smooth and looks great.

I found something weird, i checked some of the old footage and noticed that daytime videos have jello but night time videos don't...
Weather condition was about the same.
Any ideas?

My plan here is post the screenshot of my Mobula8 configuration and discussion my selected configuration, and feel free to say what a disaster these settings are, and give reasons, now anyone considering to use the settings that I am sharing, beware do so at your own risk as some of the settings that I have used are a little extreme  . On saying this, i have using these settings for near  to a year and I love the way my Mobula8 Flys,

I will start with Bluejay configuration as using https://esc-configurator.com/ and I am using Bluejay 0.19 96kHz


Why use 96kHz

• Why use 96kHz -- Gives smoother flight, longer flight times.
  
• Against using 96kHz, less torque, and some quads can not use 96kHz they simply can't take off or just flipout on takeoff - in that case use 48kHz or even 24kHz, but for micros if you can get away with it 96kHz is nice. 
  

In my configuration of you may note that I have the settings maxed out for starting power (Boost) and (Protection) [This could be considered to a be risky]
Why I have set these settings so high

• Using 96kHz, there is less start up power, and it can cause motors to flicker or rough idle on take off
  

Beeper and Beacon Strengths Maxed out.

• It's important that I find my quad, I am always flying in the bush, through trees, long grass, plus I am a bit rough, it's important to find my quad in case of a crash
  
• I have found no ill effect for maxing out the Beeper and Beacon Strengths - there is a warning maxing out these settings you might blow up a motor or ESC (So at your own risk)
  

All the motors are Reversed.

• I fly props in configuration, I found that the Mobula8 handles way better with Props in configuration.
  

Betaflight settings: Version 4.4.2
I will cover briefly 

Configuration Tab:

• 3.2 kHz PID loop
  
• Airmode on
  
• Dshot Beacon - Beacon Tone = 3 - RX_LOST enabled - RX_SET enabled
  

PID Profile:

Notes: 

• The settings are pushed a bit, but not too high and I do a fair bit of windy flying
  
• PID Controller Settings (Customised a bit can't remember) - Jitter etc
  
• Dynamic Idle set at 65 -- Keeping Prop wash at bay
  
• Thrust Linearization set at 20%
  

Rate Profile:

• Not much to say here, I forgot that I had a scaled throttle limit set.
  
• Some Expo set
  

Filter Settings:

• Doesn't look like I tried much here
  
• Raised the Gyro Filter a bit, I think I done that due to a lot of windy flying  
  

• DSHOT300
  
• BiDirectional Dshot Enabled
  
• 12 Motor Poles
  

Last but not least -- 

• I have used a Gyroflow Preset as for blackbox, as i use backbox data as with Gyroflow.
  
• Crash mode set by the CLI
  

Any questions ask away, and for those in the know anything that you think I am doing a bit weird, let's discuss. 

Anyway there are some settings to compare with 

(20-Jun-2024, 01:22 PM)fpvgeten Wrote: You're video is very smooth and looks great.

I found something weird, i checked some of the old footage and noticed that daytime videos have jello but night time videos don't...
Weather condition was about the same.
Any ideas?

That's not weird at all, as the brighter light has a faster camera shutter speed, and that in turn can capture the jello. ND filters can help in that situation.  I see that you were talking about flying in the snow, that could also be very bright with reflected light etc -- I have never flown in the snow, as I live in the hot tropics.  Still see what you can learn from my settings.

(20-Jun-2024, 02:27 PM)Cyberess Wrote: That's not weird at all, as the brighter light has a faster camera shutter speed, and that in turn can capture the jello. ND filters can help in that situation.  I see that you were talking about flying in the snow, that could also be very bright with reflected light etc -- I have never flown in the snow, as I live in the hot tropics.  Still see what you can learn from my settings.

I see, thanks for the explanation.


I will check your settings and try them out and let you know the results