A cinewhoop is the oddest-looking quad in the FPV fleet — a squat, ducted drone that looks like a flying toaster. But it is also the only quad you can legally and safely fly indoors, through narrow gaps, and close to people while capturing buttery-smooth HD footage. Building your own gives you control over weight, power, and video quality in ways an off-the-shelf BNF cannot match. Here is the complete parts list, assembly guide, and tune for a 3-inch cinewhoop in 2026.
What Defines a Cinewhoop
A cinewhoop has four distinguishing features that separate it from a standard 3-inch freestyle quad:
- Ducted propellers: Full ring ducts around every prop. These protect the props from hitting obstacles and make the quad safe to fly near people and indoor objects. They also add significant weight and reduce prop efficiency by 15–25%.
- Protected frame: The ducts are structural. The entire frame cages the electronics, so a hard hit into a wall transfers impact to the ducts, not the flight stack.
- Slow, stable flight: Cinewhoops are not fast. A 4S 3-inch cinewhoop tops out around 50–60 km/h — about half what a 3-inch toothpick can do. The goal is smoothness and predictability, not speed.
- HD camera payload: The entire reason to fly a cinewhoop is to carry a small HD camera — a naked GoPro, GoPro Bones, DJI Action 2, or Insta360 Go — and capture cinematic footage in places no other quad can fly.
Frame Options
| Frame | Wheelbase | Weight (bare) | Prop Size | Price | Notes |
|---|---|---|---|---|---|
| GEPRC Cinelog35 V2 | 142mm | 138g | 3.5-inch | $55 | Best all-around; huge prop clearance |
| BetaFPV Pavo25 V2 | 110mm | 72g | 2.5-inch | $40 | Ultra-lightweight; tight indoor spaces |
| iFlight ProTek35 | 145mm | 190g | 3.5-inch | $60 | Heavy but near-indestructible |
| Flywoo C25 | 115mm | 65g | 2.5-inch | $45 | Very light; good for Naked GoPro |
| DIY 3D printed | Custom | 80–200g | Custom | ~$5 (filament) | Fully customizable; less durable than CF |
For a first cinewhoop build, the GEPRC Cinelog35 V2 is the safe pick. It fits 3.5-inch props, has enough thrust for a full GoPro Bones, and the carbon frame is stiff enough to avoid vibration issues that plague plastic frames. The BetaFPV Pavo25 V2 is better if your primary use case is indoor flying where the smaller footprint matters more than payload capacity.
Recommended Parts List
Motors
Cinewhoop motors need to spin larger, heavier props inside restrictive ducts. This demands torque, not top-end KV. Recommended spec: 1404–1507 stator size, 3000–4000KV for 4S, 2500–3200KV for 6S.
| Motor | Stator | KV | Weight | Best For |
|---|---|---|---|---|
| T-Motor F1507 | 1507 | 3800KV | 17.5g | 4S, 3.5-inch cinewhoop |
| GEPRC 1404 | 1404 | 3750KV | 9.5g | 4S, 2.5-inch lightweight |
| Xing 1504 | 1504 | 3900KV | 13.5g | 4S, general purpose |
| iFlight XING 1507 | 1507 | 4200KV | 18g | 4S, heavy payloads |
| RCinpower 1606 | 1606 | 3200KV | 18g | 6S, high-efficiency cruising |
For a 4S build carrying a GoPro Bones, the T-Motor F1507 3800KV is the gold standard. Enough torque for 3.5-inch triblades inside ducts without overheating. For ultralight 2.5-inch builds carrying an Insta360 Go, the GEPRC 1404 3750KV saves 30g across four motors — that weight savings goes directly into longer flight time.
Flight Controller and ESC
You have two options: an AIO (all-in-one) board that integrates FC and ESC on a single PCB, or a traditional stack with separate FC and 4-in-1 ESC.
- AIO FC: Lighter (6–10g), simpler wiring, fewer failure points. Ideal for sub-250g builds. Recommendation: BetaFPV F405 20A AIO or Happymodel X12 5-in-1 (includes ELRS RX and VTX).
- Stack (FC + 4-in-1 ESC): Higher current capacity (35A+), separate components are individually replaceable. Recommendation: SpeedyBee F405 Mini stack or Mamba F405 Mini stack.
For most 4S cinewhoops, a 20–25A AIO is adequate. These motors pull 8–12A each at full throttle with 3.5-inch props in ducts. For 6S builds carrying heavy payloads, step up to a 35A stack.
Video System: Digital Options
Cinewhoops live and die by their video quality. Analog is functional but defeats the purpose — you are building this to capture footage. Digital is the standard for cinewhoops in 2026:
- DJI O4 Air Unit (Lite): The newest DJI system. 10g camera/VTX combo, onboard 4K recording with RockSteady stabilization. Pricey but eliminates the need for an external camera — the O4 Air Unit is the HD camera. This is the dream setup for a lightweight cinewhoop.
- Caddx Vista / DJI O3 Air Unit: Previous-gen DJI systems. Heavier (19–36g) but widely available used. The O3 records 4K onboard and has excellent low-light performance.
- Walksnail Avatar HD Pro: The open alternative. Excellent image quality, lighter than O3, and works with Walksnail’s ecosystem of goggles and VRX modules. Onboard DVR but less polished than DJI’s RockSteady.
If budget allows, the O4 Air Unit Lite with its integrated 4K recording makes the build radically simpler — no separate camera, no camera mount, no extra weight. If you already own DJI Goggles 2 or Integra, the O4 is an easy choice.
Props
Cinewhoop props are 3-inch to 3.5-inch triblades designed for ducts. Key requirement: the prop tip must clear the inside of the duct by at least 1mm at all RPMs — prop strike on a duct sounds like a buzz saw and will destroy both prop and duct.
- HQProp Duct-3: 3-inch, 3-blade, designed specifically for 3-inch ducts. Excellent balance, efficient.
- Gemfan D63-3: 3-inch, 3-blade. Slightly more aggressive pitch than HQProp, better thrust at the cost of slightly more noise.
- Gemfan 3520-3: 3.5-inch, 3-blade. For Cinelog35 and ProTek35 builds. The larger disc area gives noticeably more thrust for HD camera payloads.
Buy 4–5 sets. Cinewhoop props hit things. A lot.
Assembly: Wiring and Build Steps
Cinewhoop builds are tight. The ducts take up most of the frame volume, leaving a small central cavity for the stack, receiver, VTX, and wires. Plan your layout before soldering.
- Mount motors first. Thread motor wires through the frame arms to the center cavity. Use M2 screws with threadlocker — cinewhoops vibrate more than open-prop quads, and motor screws will loosen over time.
- Install the AIO or stack. Soft-mount with rubber gummies. The ducts transmit a lot of vibration to the frame; soft-mounting the FC is mandatory for clean gyro data.
- Wire motors to ESC pads. Keep wires flat against the frame. Any wire that sticks up will touch the battery strap or HD camera mount. Use the Betaflight Motor Direction wizard after wiring — do not rely on soldering motors in a specific order.
- Install receiver. The Crossfire Nano or ELRS receiver should go in the rear cavity, as far from the VTX as possible. Antenna: route along a rear arm, zip-tied to the duct. Keep it completely away from the VTX antenna.
- Install VTX and camera. On a digital build (O4/O3/Vista), the camera/VTX is a single unit. Mount it in the front camera cage with the included hardware. Ensure the camera lens sits behind the front duct plane — if the lens protrudes forward, a wall strike will destroy it.
- Power wiring. Solder the main battery leads (XT30 or XT60) to the ESC pads. Add a 35V 470µF low-ESR capacitor across the pads — ducts amplify ESC noise, and capacitors are cheap insurance against video noise.
- Battery pad. Apply the included battery pad (rubberized grip tape) to the top plate. This prevents the battery from sliding forward on impact.
Betaflight Configuration for Cinewhoop Flight
A cinewhoop needs a fundamentally different tune than a freestyle quad. The ducts make the quad inherently stable (they act like aerodynamic dampers), but they also couple vibration into the frame and reduce thrust. Tune accordingly.
Rates: Go Low
You are not flipping or rolling a cinewhoop at 900 deg/s. Set conservative rates that produce smooth, cinematic movement:
- Roll: 400–500 deg/s, center sensitivity 30–40
- Pitch: 350–450 deg/s, center sensitivity 25–35
- Yaw: 350–450 deg/s, center sensitivity 40–50
- Expo: 0.50–0.70 (very soft center stick)
Throttle Limit
Set a throttle limit of 80–90% in Betaflight. A cinewhoop at full throttle makes two problems worse: prop tips flex into the ducts (noise, damage), and the ducts create so much drag that the extra 10% throttle produces almost no additional thrust. Capping throttle also protects your ears — cinewhoops are loud at 100% throttle inside a room.
Angle Mode or Acro?
For indoor flying through tight gaps, angle mode is the pragmatic choice. Set maximum angle to 30–35 degrees. Angle mode limits how far the quad can tilt, preventing you from accidentally pitching into a ceiling or rolling into a wall. Most professional cinewhoop pilots fly angle mode indoors and switch to acro outdoors for smoother lines. Set up a flight mode switch: angle mode for proximity, acro for open air.
PID Tuning for Ducts
Ducted quads have higher drag and higher vibration than open-prop builds. The default Betaflight tune will work but will not be optimal:
- P gains: Start 10–15% lower than default. The ducts provide natural aerodynamic damping, so the quad needs less proportional correction. High P on a ducted quad produces slow, mushy oscillations — not the fast jitter of a freestyle quad.
- D gains: Also reduced by 5–10%. Excess D amplifies duct vibration and heats motors quickly.
- I gains: Keep at default or slightly higher. I-term helps the quad hold attitude against duct drag, which is particularly important at low speeds.
- TPA: Start at 0.20 with breakpoint at 1350. The ducts create nonlinear drag — at higher speeds, the quad needs less PID authority.
- RPM filtering: Essential. Ducts create strong motor-frequency-correlated noise. Enable bidirectional DShot and RPM filtering at 3 harmonics.
Battery Selection
| Cell Count | Capacity | Typical Flight Time | Best For |
|---|---|---|---|
| 4S | 650–850mAh | 3–5 minutes | 2.5-inch lightweight, indoor only |
| 4S | 850–1100mAh | 4–7 minutes | 3.5-inch, GoPro Bones payload |
| 6S | 550–650mAh | 4–6 minutes | 3.5-inch, high-efficiency cruising |
| 4S Li-Ion (P42A) | 4200mAh | 12–15 minutes | Endurance cruising (heavy, 410g) |
A 4S 850mAh LiPo is the sweet spot for most 3.5-inch cinewhoops. It balances weight against flight time and provides enough current headroom for the O4 Air Unit (which draws 8–12W). A 6S 550mAh setup is slightly more efficient but requires 6S-rated motors and ESCs — only worth it if you already have 6S batteries from other builds.
Camera Mounting: GoPro Bones and Naked GoPro
The payload defines the build. Here is what to consider:
- GoPro Bones: 60g, shoots 5.3K with HyperSmooth. The lightest full-capability GoPro. Mount it on a 3D-printed TPU cradle on the top plate, tilted 10–15 degrees up (cinewhoops fly slow, so a higher uptilt would show ground in half the frame).
- Naked GoPro (Hero 8/10/11 stripped): 27–35g, no battery (powered from FC BEC), 4K recording. Flown by pilots who want the absolute lightest HD setup. Requires soldering a 5V power lead to the FC. Fragile — one hard crash and the bare PCB can crack.
- DJI O3/O4 Air Unit onboard recording: If using O3 or O4 Air Unit, you get 4K recording built into the VTX camera. No separate camera needed. The O4 Lite at 10g is the lightest “payload” possible — and the image quality with RockSteady is excellent. This is rapidly becoming the default cinewhoop config.
- Insta360 Go 3: 35g, 2.7K, excellent stabilization. Small enough to mount even on 2.5-inch builds. The magnetic mount system makes swapping between quads trivial.
If you build with the O4 Air Unit Lite, skip the GoPro entirely. The O4’s onboard 4K with RockSteady is so close to GoPro quality that the weight savings (60g for GoPro Bones, 10g for O4) make it a no-brainer for anything under 250g AUW.
Flight Tips for Indoor and Proximity Flying
- Start in a big room. A garage, warehouse, or empty living room. Do not attempt a narrow hallway on your first battery. Cinewhoops feel sluggish after flying a 5-inch — you need to recalibrate your thumbs to the slower, heavier response.
- Altitude control is everything. Indoors, there is a ceiling and a floor. The usable altitude band is barely 2 meters in a standard room. Spend your first 3–4 packs just practicing holding a constant altitude at 1.5 meters. Throttle expo of 0.40–0.50 helps immensely.
- Fly through, not at. When approaching a gap, look through it at where you want to exit, not at the gap edges. Target fixation is real — stare at a doorframe and you will hit it.
- Kill throttle on impact. If you hit a wall, disarm immediately. A bouncing cinewhoop with props spinning will chew up drywall, furniture, and itself. Airmode makes this worse — the quad will try to “fly” off the wall and pin itself harder.
- Check ducts after every crash. A cracked duct changes the airflow around the prop, causing vibration that ruins footage and can eventually fail in flight. Replace the duct or the entire frame if cracks are structural.
A well-built cinewhoop is the most versatile quad in your fleet. It flies where nothing else can, captures footage you cannot get any other way, and — with a proper tune — flies smooth enough that your footage looks like it came from a much larger, much more expensive rig. Take your time on the build, tune conservatively, and go fly somewhere impossible.