How to Build a Tiny Whoop for Indoor Flying

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A tiny whoop is the safest, cheapest way to learn real FPV flying. It weighs about as much as a few coins, bounces off walls and furniture, and you can fly it in your living room on a rainy day. Building one also teaches you Betaflight without much soldering.

Time: 2–4 hours. Difficulty: Beginner. Soldering: minimal; most whoop parts plug in.

What makes a whoop different

A whoop has props inside ducts, so the props never touch anything. Most use an AIO (all-in-one) board that combines the flight controller, a 4-in-1 ESC and often the receiver on one tiny board. Motors plug into the board with small connectors instead of being soldered. Most whoops run on 1S batteries (one cell, 4.35 V fully charged for LiHV packs).

Parts list

65 mm frames with 31 mm props are the classic indoor size. 75 mm frames with 40 mm props have a bit more power and handle a small backyard better.

Step 1: Mount the motors

Press each motor into its frame mount and secure it with the tiny screws from your motor kit. Whoop motors come in clockwise and counterclockwise versions, often marked with wire colors. Follow your AIO’s diagram for which motor goes in which corner, or install them all and fix direction in software later.

Step 2: Mount the AIO board

1. Place rubber grommets in the frame’s mounting holes.
2. Set the AIO on the grommets with its arrow pointing forward.
3. Plug each motor into its port on the board. Route the wires so they can’t reach the props.

Step 3: Add the camera and VTX

Most whoop camera kits either plug into a dedicated connector or need three or four wires soldered: power, ground, video and sometimes a control wire. Use a fine iron tip at about 330 °C and keep joints small. Mount the camera in the canopy at roughly 15–25 degrees of uptilt.

Step 4: Configure Betaflight

Connect the board with USB and open Betaflight Configurator. Follow the main steps from our Betaflight setup guide, with whoop-specific changes:

• Receiver: built-in ELRS receivers usually appear as a serial receiver on a fixed UART. Check your board’s manual.
• Motors: with props off, test each motor. Reverse any wrong direction with the “Motor direction is reversed” option or per-motor in the ESC tab.
• Modes: add arm, Angle, Acro and turtle mode.
• Presets: many board makers publish a whoop preset. Apply it as a starting tune.
• Battery: set cell voltage warnings to about 3.3 V per cell.

Step 5: Bind and fly

Bind your ExpressLRS radio using the same binding phrase. Fly the first pack in Angle mode, then switch to Acro once you can circle the room calmly. Practice slow laps around furniture, then through doorways.

Whoop maintenance

• Hair and carpet fibers wrap around motor shafts. Check and clean them every few sessions.
• Replace props as soon as they crack or warp.
• Store 1S batteries at storage voltage (around 3.8 V) if you won’t fly for a week. See LiPo safety.

1S vs 2S whoops

Most indoor whoops run on 1S, but some 75 mm builds use 2S packs for extra punch.

For your first whoop, 1S is easier to control indoors.

Analog or digital on a whoop

Analog whoop camera combos weigh only a few grams and cost very little. Lightweight digital systems exist and give a much clearer image, but they add weight and cost and usually shorten flight time. For learning, analog is the practical choice; many pilots move to digital once they know they love whoop flying.

Battery care for whoops

Whoop batteries are tiny and easy to over-discharge:

• Set your OSD warning at about 3.3 V per cell and land promptly.
• Charge at 1C or less (a 450 mAh pack at about 0.45 A).
• Retire packs that puff or lose their punch.
• Buy at least six packs. Whoop flights are short, so you’ll want several in rotation.

Indoor flying course ideas

Build a simple course with household items:

1. Fly a loop around a chair, then a table.
2. Fly through a doorway in both directions.
3. Fly under a table and up over it.
4. Use pool noodles or hula hoops as gates.
5. Time your laps and try to improve each week.

Courses turn practice into a game and build precision faster than open flying.

Troubleshooting whoops

• Drone drifts or tilts on its own in Angle mode: recalibrate the accelerometer on a level surface.
• Short flight times: check for hair around motor shafts and replace old batteries.
• Video static: reposition the antenna and check your channel.
• Motor won’t spin: check the motor plug and look for broken wires near the motor.

Where to go next

Once you can fly a whoop smoothly through your house in Acro, you have the stick skills for a 5-inch build. Many pilots keep flying whoops for winter practice long after they move to bigger quads.