Flip any four FPV quads at a race and you’ll find two spinning props-in and two props-out. The props-out camp says yaw feels tighter and camera lenses stay cleaner. The props-in camp says it doesn’t matter and they’re not rebuilding 12 quads. Both have a point. Here’s what actually changes when you reverse motor direction — and how to configure it correctly so you don’t have a quad flipping on arm.
Step-by-Step: Configuring Reverse Prop Direction
1. What “Props Out” Actually Means
Standard (Props In):
– Front-left: CW | Front-right: CCW
– Rear-left: CCW | Rear-right: CW
– The front and rear props spin toward the center of the quad
Reverse (Props Out):
– Front-left: CCW | Front-right: CW
– Rear-left: CW | Rear-right: CCW
– The front and rear props spin away from the center of the quad
Every motor direction is reversed from standard. You can’t just swap two props — the motor spin direction must match the prop pitch direction, or the quad produces negative thrust.
2. The Flight Characteristics Difference
Yaw authority — the real advantage:
When a quad yaws, it does so by differential motor torque. If front-left and rear-right spin up while front-right and rear-left spin down, the net torque spins the quad. Props-out configuration changes the yaw dynamics subtly:
- In forward flight with props-in, the advancing prop blades (moving into the direction of flight) produce asymmetric lift that partially counteracts yaw torque.
- With props-out, the prop-wash interaction at the center of the quad differs. The outward-spinning props push dirty air outward rather than pulling it inward toward the center of the frame.
The practical result: some pilots report crisper yaw stops and less yaw washout in hard turns. The difference is measurable on a blackbox log but whether you feel it depends on how hard you fly. Pro racers can tell which setup they’re on in one corner. Casual freestyle pilots often can’t feel the difference at all.
Camera cleanliness:
This matters more than the yaw debate. With props-in, the front props fling grass, dirt, and moisture directly onto the camera lens. With props-out, the front props fling debris outward — away from the camera. After a wet grass landing, a props-in quad has a misted lens. A props-out quad has a clean lens. Over hundreds of flights, this alone makes props-out worthwhile for most pilots.
Turtle mode behavior:
When you activate turtle mode (flip over after crash), the quad reverses two motors to flip itself. With props-in, the standard turtle mode configuration sometimes struggles because the airflow pattern is fighting itself near the center. With props-out, turtle mode usually works on the first attempt because the outward airflow finds less resistance.
3. Betaflight Configuration
Step A: Motor Direction Reversal in Betaflight 4.3+
Betaflight 4.3 added a dedicated “Motor Direction is Reversed” slider that handles all the underlying changes:
Configuration tab:
- Motor direction is reversed: ON
This single toggle:
- Reverses motor spin direction in the mixer
- Reverses yaw direction in the PID controller
- Updates the motor direction wizard
Step B: Change Motor Direction in BLHeli
After enabling the Betaflight toggle, you must physically reverse each motor’s spin direction:
Method 1 — BLHeliSuite / BLHeli Configurator:
1. Connect to ESCs via passthrough
2. For each ESC, toggle "Motor Direction" (Normal → Reversed, or vice versa)
3. Write settings to all ESCs
Method 2 — Betaflight Motor Direction Wizard (4.3+):
1. Motors tab → "Reorder and Reverse Motors" wizard
2. Follow the on-screen prompts
3. The wizard spins each motor individually — tap the prop direction you want
Verification:
1. Props OFF
2. Motors tab → spin each motor individually at low RPM
3. Verify: front-left CCW, front-right CW, rear-left CW, rear-right CCW (props-out)
4. Props ON (checked for correct pitch direction — the leading edge of each prop should spin INTO the rotation direction)
5. Arm in angle mode on a flat surface. The quad should lift off level.
What happens if you get it wrong: If you enable “Motor direction is reversed” in Betaflight but don’t reverse the physical motors in BLHeli, the quad flips instantly on arm. The PID controller expects CCW torque from motor 1 but gets CW torque — it corrects by adding more power, which makes it flip harder, which makes it correct more. This feedback loop destroys props and can damage motors.
4. Prop Selection for Props-Out
Not all props are directional, but when they are, you need the right ones:
- Standard props-in (CW front-left, CCW front-right): Standard prop sets marked CW/CCW
- Props-out (CCW front-left, CW front-right): Swap the CW and CCW props in each pair
With bi-blade props, the pitch direction is obvious from the blade angle. With tri-blade and quad-blade, look for the marking on the hub — “R” usually indicates clockwise rotation when viewed from above.
Our propeller selection guide covers pitch, blade count, and material matching in detail.
5. Fine-Tuning Yaw PID After Reversal
After switching to props-out, some quads need minor yaw PID adjustment:
Default Betaflight 4.3 yaw PIDs work well with both configurations.
If you experience:
- Yaw overshoot (quad yaws past your stick input and wobbles back): Lower yaw P by 5-10
- Yaw sluggishness (quad feels slow to initiate yaw): Raise yaw P by 5-10
- Yaw bounce on hard stops: Increase yaw D by 5
The yaw PID loop is usually the least sensitive to prop direction changes. Most builds don’t need any adjustment after the switch.
Props In vs Props Out Comparison
| Characteristic | Props In (Standard) | Props Out (Reverse) |
|---|---|---|
| Yaw authority | Good — standard for years | Slightly better — less center-frame turbulence |
| Camera cleanliness | Front props fling debris at lens | Front props fling debris outward |
| Turtle mode reliability | Works, sometimes needs multiple attempts | Works more reliably on first attempt |
| Prop wash in center | Air converges at center → turbulence | Air diverges from center → cleaner |
| Grass/gravel landings | Camera gets dirty | Camera stays cleaner |
| Prop strikes on objects | Object gets pulled INTO props at front | Object pushed AWAY from props at front |
| Configuration effort | Default on all new builds | Requires motor reversal in BLHeli |
| Parts availability | Standard CW/CCW prop sets | Same prop sets, just swapped positions |
Common Mistakes & How to Avoid Them
Mistake 1: Reversing Betaflight But Not BLHeli
What people do: Enable “Motor direction is reversed” in Betaflight, flash new props, and arm.
Consequence: The quad flips violently. The PID controller commands a correction in one direction but gets response in the opposite direction. It commands a larger correction, which makes the flip worse. Total damage in under 0.5 seconds: four destroyed props and a bent motor shaft.
Fix: Always reverse both. Betaflight toggle tells the PID controller what to expect. BLHeli direction change makes the motors actually deliver it. These must match.
Mistake 2: Forgetting to Swap Props
What people do: Reverse motor direction in BLHeli but leave the original props on.
Consequence: A CW-spinning prop with CCW pitch produces negative thrust. The quad sits on the ground with motors screaming at full speed, producing effectively zero lift.
Fix: After reversing motors, verify each prop. The leading edge (higher side of the blade) must spin into the direction of rotation. If it’s trailing, swap the CW and CCW props on that motor or flip the prop over (depending on prop design).
Mistake 3: Assuming Props-Out Fixes Bad Tune
What people do: Their quad has yaw washout from bad PID tuning or mechanical issues. They switch to props-out hoping it’s a magic fix.
Consequence: The underlying problem (loose arm, excessive D-term noise, bent motor bell) remains. Props-out might mask it slightly, but the quad still flies poorly — just in a different way.
Fix: Tune your quad properly before evaluating prop direction changes. Props-out is an optimization, not a fix. If your quad has yaw problems on props-in, it has yaw problems on props-out too.
Mistake 4: Not Testing Turtle Mode After the Switch
What people do: Switch to props-out, fly, crash, activate turtle mode, and the quad doesn’t flip.
Consequence: Turtle mode behavior changes slightly with prop direction. A quad that flips reliably on props-in may need different turtle mode power settings on props-out. If you only discover this when you’re upside-down in tall grass 500m away, you’re walking.
Fix: After switching, test turtle mode at close range. Arm, land upside-down deliberately (or activate it right-side-up — the quad should rock but not flip completely). If it struggles, increase the turtle mode power in the CLI: set turtle_mode_power = 0.80 (default is 0.70).
⚠️ Regulatory Notice: The flight configuration advice in this article should be followed in accordance with the latest 2026 drone regulations in your country or region. Always verify local laws regarding flight altitude, no-fly zones, remote ID requirements, and registration before flying. Regulations vary significantly between the FAA (US), EASA (EU), CAA (UK), CAAC (China), and other authorities.
Internal Links
For prop matching with your build, our propeller selection guide covers pitch, blade count, and material trade-offs. When you’re ready to dial in how the quad responds to stick input, our Betaflight rates and expo guide walks through RC rate, super rate, and expo configuration. Motor selection for different prop configurations gets full coverage in our motor sizing guide.
YouTube Resource
Joshua Bardwell’s props out configuration guide covers the BLHeli reversal process and Betaflight setup step by step:
uavmodel Product Recommendation
The Gemfan Hurricane 51466 tri-blade props (available at uavmodel.com) include both CW and CCW pairs in each pack, making the props-out swap effortless — just exchange the CW and CCW positions on each arm.