Building a Tiny Whoop: Complete Parts List and Assembly Guide for Indoor FPV

Building a Tiny Whoop: Complete Parts List and Assembly Guide for Indoor FPV

Tiny whoops are the gateway to FPV flight for thousands of new pilots every year, and they remain endlessly entertaining even for veterans with shelves full of 5-inch quads. A well-built whoop lets you fly through chair gaps, under tables, and around houseplants on rainy days when outdoor flying is impossible. Building your own — rather than buying a bind-and-fly model — teaches you the fundamentals of quadcopter assembly in a low-risk format where crashes rarely break anything. This guide walks through a complete 2026-spec 65mm and 75mm whoop build, from parts selection to first hover.

Choosing Your Whoop Platform: 65mm vs. 75mm

The first decision is frame size. A 65mm whoop spins 31 mm propellers and weighs 19–25 grams all-up. It flies beautifully in small apartments and tight indoor spaces but struggles outdoors in any meaningful wind. A 75mm whoop uses 40 mm propellers, weighs 25–35 grams, and bridges the gap between pure indoor and light outdoor flying — it has enough power to fight a gentle breeze and can carry an HD recording setup like the Runcam Thumb or Walksnail Avatar Nano. For pure indoor acrobatic flying, the 65mm is king. If you want one whoop that does everything, build a 75mm.

Complete 75mm Tiny Whoop Parts List (2026)

Here is a proven parts list for a 75mm digital whoop that delivers 4+ minutes of aggressive indoor flight time on a 1S 550 mAh battery:

• Frame: BetaFPV Meteor75 Air Frame or NewBeeDrone Cockroach 75 Lite. Both weigh under 7 grams with integrated prop guards and use durable polypropylene that survives hundreds of crashes.
• Flight Controller and ESC (AIO): BetaFPV Matrix 1S 5-in-1 AIO (F4 processor, 5A ESCs, built-in ExpressLRS 2.4 GHz receiver, and 25–400 mW VTX). This all-in-one board eliminates wiring between components and keeps weight under 5 grams. The ELRS SPI receiver provides 500 Hz update rates with sub-1 ms latency.
• Motors: RCinPower GTS V4 0802 25000KV or Happymodel EX0802 25000KV. The 0802 stator size hits the sweet spot between thrust and efficiency on 40 mm props. 25000KV is appropriate for 1S voltage; 20000KV variants exist for 2S builds but add weight.
• Propellers: Gemfan 1610-2 (40 mm, 2-blade). Two-blade designs give longer flight times than three-blade on 1S whoops. The 1610 pitch produces strong thrust without overtaxing the 5A ESCs.
• Camera and VTX: For analog, the Caddx Ant Nano (1.6 g) paired with the built-in VTX on the AIO board. For digital HD, the Walksnail Avatar Nano Lite V3 weighs 8.7 grams including camera and VTX board and delivers 1080p 60 FPS with 22 ms glass-to-glass latency — transformative for whoop flying where seeing branches and door frames clearly prevents crashes.
• Battery: BetaFPV Lava 1S 550 mAh or Tattu R-Line 1S 550 mAh with BT2.0 or GNB27 high-current connectors. Standard PH2.0 connectors suffer from voltage sag above 5A draw; the BT2.0 and GNB27 solve this with solid-pin contacts rated for 15A continuous.
• Canopy: A lightweight TPU-printed canopy. The Mobula7-style canopy available on Thingiverse and Printables fits most 75mm frames and protects the camera and AIO board while adding only 1.5 grams.

Step-by-Step Assembly Instructions

Step 1: Motor Installation. Install the four motors into the frame ducts using the included M1.4 or M1.6 screws. Torque gently — these tiny screws strip the plastic motor mounts easily. The motor wires should exit toward the center of the frame. Arrange motors so that the wire routing reaches the AIO board pads without crossing or tension. On most whoop frames, the motors install from the bottom of the ducts with the prop shaft pointing up.

Step 2: AIO Board Mounting. The AIO board mounts to the frame using rubber grommets or nylon standoffs. BetaFPV frames include press-fit rubber grommets that provide vibration isolation — use them. Orient the board so the USB port is accessible from the side or rear of the frame and the motor pads are distributed evenly around the perimeter. Do not overtighten the mounting screws; the grommets should have some compliance to absorb prop vibrations.

Step 3: Motor Wiring. Cut motor wires to length, leaving roughly 5 mm of slack. Strip 1.5 mm from the ends using fine-gauge wire strippers — 30 AWG wire is unforgiving; use the 30 AWG notch on your stripper or a razor blade with care. Tin each pad and wire tip as described in our soldering guide. Solder in the standard Betaflight motor order: motor 1 (rear right, clockwise), motor 2 (front right, counter-clockwise), motor 3 (rear left, counter-clockwise), motor 4 (front left, clockwise). Double-check pad assignments against your specific AIO board’s silkscreen — they sometimes differ.

Step 4: Camera and VTX Connection. For analog builds, solder the camera’s three wires (5V power, ground, video signal) to the corresponding AIO board pads. For Walksnail digital builds, the Avatar Nano connects via a JST-SH 1.0 mm 4-pin plug on the AIO board that provides 5V, ground, RX, and TX for the MSP DisplayPort OSD link. Secure the camera in the canopy using two M1.4 screws, adjusting the camera angle to approximately 20 degrees for mixed indoor and proximity flying.

Step 5: Canopy Installation. Route the camera wires neatly under the canopy and snap or screw the canopy onto the frame. Ensure the VTX antenna (built into the AIO board as a ceramic chip antenna or a small wire antenna) has clearance and is not pressed against carbon or metal. For AIO boards with a wire antenna, route it through a small hole in the canopy and secure with a zip tie — use the zip tie tail as an antenna strain relief.

Step 6: Final Inspection. Before plugging in a battery, use a multimeter in continuity mode to check for shorts between the battery positive and ground pads on the AIO board. Check that no motor screws are protruding into the motor windings — a common and catastrophic assembly error on tiny motors. Visually inspect all solder joints for bridging, especially around the tiny motor pads that are often spaced only 1 mm apart.

Betaflight Configuration for Whoops

Connect the whoop to Betaflight Configurator. Flash Betaflight 4.6 with the appropriate target for your AIO board — the Matrix 1S uses the BETAFPVF4SX1280 target. Apply the following configuration:

• ESC Protocol: DShot300 with bidirectional DShot enabled. Set motor poles to 12 for most 0802 motors. Enable RPM filtering with 3 harmonics.
• PID and Filters: Apply the “Whoop 75mm 1S” preset from the Betaflight Presets tab. This preset reduces P and D gains by roughly 40% compared to open-prop values and configures appropriate gyro lowpass cutoff frequencies for the high-RPM noise profile of 25000KV motors.
• Rates: For indoor flying, RC Rate of 1.0 with Super Rate of 0.72 and Expo of 0.30 provides precise control around center stick with full flip authority at extremes. Reduce to 0.65 Super Rate if you are new to indoor acro.
• Receiver: ExpressLRS SPI receiver at 500 Hz packet rate. Configure the ELRS binding phrase in the CLI.
• Modes: Set ARM to a convenient switch. Enable Angle mode on a separate switch for tight indoor navigation. Set Turtle Mode (Flip Over After Crash) on a momentary switch — it is essential for whoops that land upside down under furniture.
• VTX: Set power to 25 mW for indoor flying with other pilots. 25 mW provides more than enough range inside a house and avoids dominating the video spectrum.

First Flight and Tuning Refinements

Arm the whoop in a clear area. It should lift off smoothly at roughly 30–40% throttle. If it oscillates violently at hover, your P gain is too high — load the next-lower whoop preset. If it drifts in angle mode, calibrate the accelerometer on a truly level surface — use a bubble level on your workbench, not the floor, as floors are rarely perfectly level. Check motor temperatures after a 2-minute hover test; motors should be warm (40–50°C) but not hot to the touch. If motors are hot, increase D-Term Filtering in 0.1 increments until temperatures drop to acceptable levels, or reduce the P and D Gain slider by 0.1.

Fly at least five packs in angle mode before attempting acro indoors. The enclosed space, ducted props, and proximity to walls create a flight dynamic that differs significantly from open-prop flying — the ducts catch air currents and create ground-effect turbulence near floors and ceilings. Once you can fly figure-eight patterns through chair legs and power loops over ceiling fans in angle mode, switch to acro and rediscover the challenge all over again.

A well-built 75mm whoop in 2026 costs roughly $120–150 in parts, flies for 4–5 minutes per pack, and survives crashes that would total a 5-inch quad. It is the most flight time per dollar in the entire FPV hobby, and the skills you build flying tight indoor lines translate directly to better outdoor flying. Start building, and fly every day regardless of weather.