A 5-inch tune on a whoop flies like garbage. The physics are completely different — a 20g whoop changes direction in 50ms while a 600g 5-inch takes 200ms. The default Betaflight PIDs are tuned for 5-inch and will oscillate a whoop on the first punch. Here’s the whoop-specific tuning workflow that I’ve refined across hundreds of indoor packs.
Whoop Tuning: Why Default PIDs Don’t Work
The problem is inertia, or the lack of it. A 65mm whoop weighing 19-22g has roughly 1/30th the rotational inertia of a 250g 5-inch build. The same P-gain that gently corrects a 5-inch will overshoot a whoop by 20 degrees, causing visible oscillation in the FPV feed. You need lower P, lower D, and higher rates — and you need to think about throttle differently because whoops fly at 30-50% throttle where 5-inch quads are just hovering.
Step 1: Start With a Whoop-Specific PID Profile
In Betaflight PID Tuning tab, start with these values for a 65mm whoop on 1S:
65mm Whoop (19-25g, 31mm props, 0802 19000-25000KV):
– Roll P: 40, I: 70, D: 25
– Pitch P: 42, I: 72, D: 27
– Yaw P: 45, I: 70, D: 0
75mm Whoop (25-35g, 40mm props, 0802/1002 18000-22000KV):
– Roll P: 45, I: 75, D: 28
– Pitch P: 47, I: 77, D: 30
– Yaw P: 50, I: 75, D: 0
These are starting points. Yaw D is zero because whoop yaw authority is naturally damped by the ducted design — adding D creates high-frequency motor noise with no benefit.
Step 2: Set Feed Forward (The Secret to Whoop Responsiveness)
Whoops need fast stick response because they’re flown in tight spaces where every millisecond of delay means a wall hit. The default feed forward of 60 is too low — the quad feels “delayed” behind the stick.
set f_pitch = 120
set f_roll = 120
set f_yaw = 100
At 120, the whoop snaps to your stick movements instantly. If you see overshoot on sharp stick stops (a quick “bounce” after centering), lower by 10 and retest.
Step 3: Throttle Scaling for Indoor Control
Whoops are twitchy at hover because you’re using 3-5% of the available throttle range. Betaflight’s throttle mid and throttle expo let you expand the low end of the curve.
In the PID Tuning tab, under Throttle and Motor Settings:
Throttle MID: 0.30
Throttle EXPO: 0.60
This spreads the lower 30% of the throttle stick over more physical travel, giving you resolution where you need it — hovering through gaps and maintaining altitude in ground effect. At MID 0.30 and EXPO 0.60, 25% physical stick travel equals about 12% motor output, giving you roughly twice the control resolution at hover compared to linear throttle.
Step 4: Set Motor Output Limit for 1S Longevity
0802 motors on 1S at 20000+ KV spin fast enough to pull the battery voltage into the ground. Limiting motor output to 85-90% prevents sag-induced brownouts that cause the FC to reboot mid-flight.
set motor_output_limit = 85
At 85%, you lose roughly 10% of peak thrust, but you gain consistent power delivery throughout the entire pack — no more “first 30 seconds it flies great, then it gets sluggish” behavior.
Step 5: Angle Mode Settings for Indoor Racing
If you fly angle mode indoors (most whoop pilots do), the default angle strength of 50 is too aggressive for tight courses.
set angle_strength = 35
At 35, the whoop self-levels without fighting your stick inputs. You can make sharp turns without the FC trying to level the quad mid-corner and pushing you into the wall. At 50, you’re fighting the FC on every turn.
Whoop PID Reference Table
| Parameter | Betaflight Default (5-inch) | 65mm Whoop (1S) | 75mm Whoop (1S) | Effect of Too High | Effect of Too Low |
|---|---|---|---|---|---|
| Roll P | 45 | 40 | 45 | Visible oscillation in FPV | Soft, delayed roll response |
| Pitch P | 50 | 42 | 47 | Bounce on punch-out | Nose dips during throttle |
| Yaw P | 45 | 45 | 50 | Yaw overshoot, tail wag | Slow yaw, spins wide |
| Roll/Pitch D | 25/27 | 25/27 | 28/30 | Hot motors, motor buzz | Propwash on descent |
| Yaw D | 20 | 0 | 0 | Motor noise at idle | N/A — not needed on whoops |
| Feed Forward | 60 | 120 | 120 | Overshoot on stick stops | Delayed stick feel |
| Throttle MID | 0.50 | 0.30 | 0.30 | Dead zone at low stick | Too sensitive at hover |
| Motor Limit | 100% | 85% | 85% | Low peak thrust | Brownouts on fresh battery |
What Most Whoop Pilots Get Wrong
Mistake 1: Copying 5-inch PIDs directly
A 5-inch PID profile produces violent oscillation on a whoop within the first throttle blip. The P-gain that works for a 250g quad creates a positive feedback loop on a 20g quad — the correction overshoots, the FC tries to correct the overshoot, and the oscillation compounds. The fix: Cut P values by roughly 30-40% from 5-inch defaults and start from there.
Mistake 2: Running linear throttle indoors
Linear throttle on a 1S whoop puts the entire hover range in the first 15% of stick travel. Your thumb has about 2mm of usable resolution. The fix: Throttle MID 0.30 + EXPO 0.60 expands that to roughly 5mm of usable travel — it’s the difference between constantly bouncing off the ceiling and smooth altitude control.
Mistake 3: Ignoring motor output limit on 1S
A fresh 1S 300mAh battery at 4.35V (HVLi) pushes 0802 25000KV motors past their efficient RPM range. The resulting voltage sag drops the 5V rail below the FC’s brownout threshold — about 3.0V input — and the quad reboots mid-air. The fix: Motor output limit at 85%. The whoop loses a tiny bit of peak punch but never browns out, even on the first pack off the charger.
Mistake 4: Not re-tuning after a frame swap
Whoop frames vary significantly in stiffness. The Mobula6 frame is a wet noodle compared to the Meteor65 frame. A tune that works on a stiff frame oscillates on a flexible frame because the frame itself resonates and feeds that vibration into the gyro. The fix: If you swap frames, drop all P and D by 5 points and re-tune from there.
Mistake 5: Using the same tune for 300mAh and 450mAh packs
A 450mAh battery adds roughly 8g to a 65mm whoop — a 40% weight increase. The PID controller is now correcting a heavier, slower quad with more inertia. The result is sluggish response and propwash on descent. The fix: Maintain two rate profiles — one for light packs, one for heavy. Increase P by 5-8 and D by 3-5 for the heavy pack profile.
⚠️ Regulatory Notice: Tiny whoops under 250g are exempt from Remote ID requirements in the US under current FAA regulations, but this exemption is under periodic review. Always follow the latest 2026 drone regulations in your country or region. Indoor flying in your own home is generally unregulated, but flying in shared spaces, parking garages, or public buildings may require permission. Regulations vary significantly between the FAA (US), EASA (EU), CAA (UK), CAAC (China), and other authorities.
For whoop pilots stepping up to larger builds, our motor sizing guide explains how motor physics scale with size. Once you’ve got your whoop locked in, our Betaflight rates guide covers how to match your rates across every quad in your fleet.
The Happymodel Mobula series sets the benchmark for out-of-the-box whoop performance, and the latest Mobula6 2024 ECO with 0802 25000KV motors is a solid platform for the tuning workflow above — available at uavmodel.com.