# How to Fix FPV Drone Jello and Vibrations in HD Footage
If your FPV drone footage looks like it was filmed during an earthquake, you’re dealing with **jello** — the wavy, rolling-shutter distortion caused by high-frequency vibrations reaching your camera sensor. This guide walks you through identifying and eliminating jello at its source, so you can capture buttery-smooth HD footage every time.
## What Causes Jello in FPV Footage?
Jello occurs when frame-rate vibrations sync with the camera’s rolling shutter. Instead of a single cause, jello is usually the result of several small issues stacking up. The most common culprits:
– **Bent or unbalanced propellers** — even a tiny nick creates asymmetric thrust vibration
– **Loose or soft-mounted camera** — the camera moves independently of the frame
– **Excessive motor vibration** — worn bearings, bent bells, or loose magnets
– **Frame resonance** — the frame itself amplifies certain motor RPM ranges
– **Over-tightened or missing soft mounts** — the flight stack transmits motor vibration to the camera
– **High D gain** — D-term oscillations manifest as fine jitter in the video
## Step-by-Step Jello Diagnosis
### Step 1: Check Your Propellers First
This is the most common cause and the easiest fix. Inspect every propeller carefully:
| Sign | What It Means | Fix |
|——|—————|—–|
| Nicks or chips on blade edges | Prop struck something | Replace the propeller |
| One blade bent slightly | Uneven thrust per rotation | Replace the propeller |
| Prop not seating flat on motor | Hub damage or debris | Clean motor bell, replace prop |
| Excessive blade flex | Wrong prop material for build weight | Switch to stiffer props (e.g., HQProp, Gemfan 51466) |
**Pro tip**: After replacing props, test-hover without the HD camera mounted. If vibrations are gone, the props were the problem.
### Step 2: Inspect the Camera Mount
Your HD camera (GoPro, DJI Action, Insta360) needs to be held firmly. Check:
– **TPU mount**: Is it cracked, loose, or sagging? Replace if so.
– **ND filter**: A loose ND filter vibrates independently and creates micro-jello. Use a snug-fitting filter.
– **Screws**: Tighten all mounting screws — but don’t overtighten, which can crack TPU.
### Step 3: Motor Health Check
Spin each motor by hand (props off, battery disconnected). Listen and feel for:
– **Grinding/scratching**: Worn bearings — replace the motor or bearings
– **Notchy rotation**: Debris between magnets and stator — clean with compressed air
– **Loose bell**: The bell shifts up/down — tighten the C-clip or replace motor
– **Bent shaft**: Visible wobble when spinning — replace the motor
A healthy motor spins smoothly and silently with uniform magnetic cogging.
### Step 4: Frame and Stack Soft Mounting
| Component | Best Practice |
|———–|—————|
| Flight controller | Use rubber grommets in all mounting holes |
| ESC/4-in-1 | Nylon standoffs with O-rings (not metal screws alone) |
| Arms | Check for cracks; replace if damaged |
| Frame screws | All tight; use blue Loctite on metal-to-metal |
Vibration travels through rigid paths. Every soft mount you install breaks that path.
### Step 5: Betaflight Filter Tuning
If the mechanical fixes don’t fully resolve jello, tune your filters:
1. Enable **RPM Filtering** (requires BLHeli_32 or Bluejay with bidirectional DShot)
2. Set **Gyro LPF1** to `Dynamic` with a cutoff around 250 Hz
3. Set **DTerm LPF1** to `Dynamic` with a cutoff around 150 Hz
4. Enable **Dynamic Notch Filter** — set to `Auto` with Q factor of 250-300
5. Reduce **D gain** by 5-10% on all axes, especially pitch and roll
After tuning, do a test flight and check the gyro_scaled spectrogram in the Blackbox Explorer. You should see clean traces without persistent frequency bands.
## Recommended Parts for Vibration-Free Builds
A well-designed flight controller with effective onboard filtering makes a huge difference. The **SpeedyBee F405 V4 Flight Controller** features a BMI270 gyro with excellent vibration rejection and built-in soft mounting options. Available at [uavmodel.com](https://uavmodel.com).
## Video Guide: Diagnosing and Fixing FPV Jello
## Summary Checklist
– [ ] Replace any nicked or bent propellers
– [ ] Secure camera mount and ND filter
– [ ] Check all four motors for bearing noise or bent shafts
– [ ] Verify frame arms are crack-free and all screws are tight
– [ ] Ensure FC and ESC have soft mounting (grommets/O-rings)
– [ ] Enable RPM filtering and Dynamic Notch in Betaflight
– [ ] Back off D gain by 5-10% if oscillations persist
A smooth quad is a fast quad. Fix the jello and your footage — and your flying — will thank you.