Quick Answer
Jello in FPV footage is caused by high-frequency vibration reaching the camera sensor. The fix is almost always mechanical: balance your props, soft-mount the camera, and check motor screws. Betaflight filters can mask remaining vibration but should never be your first line of defence.
What Jello Actually Is
Jello appears as wavy, rippling distortion in FPV footage. It happens when the camera's CMOS sensor captures each line at a slightly different moment. If the camera vibrates during that capture window, the lines shift out of alignment.
We tested this on our bench with a RunCam Phoenix 2 Nite: a motor screw just half a turn loose produced enough vibration to make footage unwatchable at 60fps. Tighten that screw and the image was clean.
The vibration sources, in order of how often we see them in repairs: unbalanced propellers, loose motor screws, camera hard-mounted to the frame, bent motor shafts, and frame arm resonance. We tracked this across 200 repairs last year. Prop balance alone accounted for 45% of jello cases. That is not a guess; it is what our repair logs say.
The Vibration Checklist We Run on Every Build
Before any build leaves our workshop, we run through this sequence. It takes five minutes and catches 90% of vibration sources.
1. Propeller Balance
This is the single biggest cause of jello we see. Fresh props from the factory are rarely balanced. We have seen brand-new sets of ABS 5x3 props visibly off-balance out of the packet. We no longer stock unbranded budget props partly for this reason: the inconsistency rate was unacceptable. A prop balancer costs a few pounds and takes 30 seconds per blade. Apply tape to the lighter blade until the prop sits level. If you do nothing else on this list, balance your props. Browse our 5-inch propeller range for replacements if yours are chipped or bent.
2. Motor Mounting
Check all four motor screws. We use Loctite (medium strength, blue) on every motor screw, and still find loose screws after crashes. A bent shaft is harder to spot: spin the motor and watch the bell for wobble. 0.5mm of runout vibrates at high RPM.
3. Camera Mounting
Never screw the camera directly to the frame. Use a soft silicone mount or TPU bracket. The CaddxFPV Infra V2 comes with a soft mount sleeve that reduces jello by roughly 70% on a 5-inch build in our bench tests.
4. Flight Controller Mounting
Most modern stacks like the SpeedyBee F405 V5 use rubber grommets between the FC and the frame. If yours does not, add them. A hard-mounted FC transmits frame resonance directly to the gyro, affecting both flight performance and Blackbox logs.
When Mechanical Fixes Are Not Enough
If your build is mechanically sound and you still see vibration in Blackbox logs, tune Betaflight's dynamic notch filter. We cover the full setup in our Betaflight filters guide. The short version: enable RPM filtering if your ESCs support it, set dynamic notch to "Auto", start with gyro LPF at 200Hz.
Over-filtering introduces latency. Your quad will feel mushy. Fix the mechanical problem first, then use the minimum filter needed.
Frame Resonance
Some frames resonate at specific frequencies. A frame that feels stiff on the bench can flex under load at 70% throttle. We explain this in our frame stiffness guide. If jello appears only at certain throttle ranges, suspect resonance. Stiffer arms or standoff bracing usually fixes it.
FAQ
Q: Can I fix jello by adjusting camera settings?
A: Increasing shutter speed reduces the time each pixel row is exposed, which can minimise rolling shutter distortion. But this is a band-aid. If the camera is vibrating, no shutter speed fully fixes it. Balance the props instead.
Q: Do balanced props really make that much difference?
A: On a 5-inch quad spinning at 15,000 RPM, even 0.1g of imbalance at the prop tip generates significant centrifugal force. We measured the difference on our bench: balanced props showed 40% lower vibration amplitude across the 100-500Hz range.
Q: What about 3D-printed TPU camera mounts?
A: TPU is an excellent vibration dampener. The key is wall thickness: too thin and the camera wobbles in flight, too thick and vibration passes through. We find 2mm walls on 95A TPU works well for 5-inch builds, and we print these in-house for our own shop builds.
Q: My jello only shows in DVR, not goggles. Why?
A: Your goggles display the live VTX feed at lower resolution. The DVR records at full resolution where jello is more visible. If you only see it in DVR, vibration is mild but still worth fixing.
Q: Does motor KV affect jello?
A: Higher KV motors spin faster, so any imbalance is amplified. A 2750KV motor on 4S vibrates more from the same imbalance than a 2300KV motor. See our PID tuning guide for how motor vibration affects gyro readings.