# How to Build Your First 5-Inch FPV Drone: A Complete Step-by-Step Guide

**Problem:** You’ve watched the YouTube videos, joined the Discord servers, and filled your shopping cart with parts. But when everything arrives, the reality hits — you’re staring at a pile of circuit boards, wires, motors, and a carbon fiber frame with no instruction manual. Building an FPV drone from scratch is intimidating, and one wrong connection can turn your $300 investment into a paperweight.

This guide walks you through the entire build process, from unboxing to first hover, with clear steps that assume zero prior experience.

## What You’ll Need: The Complete Parts List

Before you touch a single screw, make sure you have every component. Here’s a complete 5-inch build parts list:

**Total: ~$283** for a full build that will fly as well as anything under $500 RTF.

You can source most of these components as a bundle at [uavmodel.com](https://uavmodel.com), which stocks complete FPV build kits that save you the hassle of compatibility checking.

### Tools You Also Need

– Soldering iron (TS100 or Pinecil at 350°C)
– 63/37 rosin-core solder, 0.8mm
– Flux pen (no-clean)
– Hex driver set (1.5mm, 2mm, 2.5mm)
– M5 prop nut wrench (8mm socket)
– Wire strippers (30-20 AWG)
– Tweezers
– Multimeter (for continuity testing)
– Smoke stopper (non-negotiable)
– Heat shrink tubing assortment
– Zip ties and electrical tape

## Step 1: Dry-Fit the Frame

Before any soldering, assemble the bare frame to understand how everything fits together.

1. Lay out all frame parts on your work mat
2. Assemble the bottom plate with arms — do NOT tighten screws fully yet
3. Install standoffs (usually 25-30mm for a standard stack)
4. Place the top plate loosely
5. Verify all screw holes align and standoffs are straight
6. Now disassemble and set aside — you’ll rebuild it around the electronics

This step catches manufacturing defects and lets you plan wire routing before the tight spaces trap you.

## Step 2: Mount Motors to Arms

Mount each motor to its arm with the hardware provided:

1. Position motor on the arm — wires should exit toward the center of the frame
2. Use M3 screws (typically 6-8mm length for 4mm arms)
3. **Critical:** Check that no screw protrudes through the arm and touches the motor windings. If you feel resistance near the end of threading, STOP — your screws are too long
4. Add a drop of blue threadlocker to each screw if your motors didn’t come with pre-applied threadlocker
5. Tighten in a cross pattern, but don’t crank — carbon fiber can delaminate under excessive pressure

Route motor wires toward the center of the frame loosely. You’ll trim them to exact length once the stack is in place.

## Step 3: Install the Flight Controller / ESC Stack

Modern stacks are two boards: ESC (bottom) and Flight Controller (top), connected by a multi-pin harness or ribbon cable.

### ESC Board

1. Install the ESC board on nylon standoffs (usually included with the frame)
2. Position so the battery pads face the rear of the frame
3. Secure with nylon nuts — do NOT overtighten against the ESC PCB

### Flight Controller

1. Connect the FC-to-ESC harness — arrow-to-arrow orientation matters
2. Mount the FC on top standoffs with nylon nuts
3. Ensure the arrow on the FC points forward (toward the camera)

### Wiring the Battery Leads

1. Solder the XT60 pigtail to the ESC battery pads (red to +, black to -)
2. If your ESC supports it, solder a low-ESR capacitor (35V 470-1000μF) across the battery pads — this smooths voltage spikes
3. Position the capacitor so it sits between the arms or along the side — not on top where it blocks the stack

## Step 4: Wire the Motors

This is the most time-consuming step. Precision matters.

### Trim Motor Wires

1. Route each motor wire bundle to the corresponding ESC pad
2. Trim wires so they reach the pad with about 5mm of slack — no more, no less
3. Strip 3mm of insulation from each wire end

### Solder Motor Wires

For each motor (4 total, 3 wires each = 12 joints):

1. Tin the ESC pad with solder
2. Tin the stripped wire end
3. Apply flux to the pad
4. Press wire against pad, touch iron to both, hold 1-2 seconds
5. Inspect for shiny flow, no cold joints

### Motor Order Convention

Standard Betaflight motor layout (front of quad facing away from you):

Wire order doesn’t matter right now — we’ll verify direction later in Betaflight and swap any two wires to reverse direction if needed.

## Step 5: Install FPV Camera and VTX

### Camera

1. Mount the camera in the frame’s camera cage — typically using two M2 screws
2. Set the camera angle: 20-25° for beginners, 30-35° for moderate speed
3. Route the camera cable to the FC — most FCs have a dedicated camera plug
4. If using direct-solder: yellow (video) to CAM pad, red (5V) to 5V, black to GND

### VTX (Video Transmitter)

1. Mount VTX on the top plate or rear of the frame — it needs airflow
2. Connect to FC: yellow (video) to VTX pad, red (7-36V typically) to BAT+/9V pad, black to GND
3. SmartAudio wire (usually white) to a free UART TX pad
4. Screw on the VTX antenna FIRMLY — **never power a VTX without an antenna attached**
5. Zip-tie the antenna to the frame so it doesn’t hit props

## Step 6: Install the Receiver

For ELRS (the current standard):

1. Solder RX to a free UART: RX wire to TX pad, TX wire to RX pad, 5V to 5V, GND to GND
2. Mount the receiver away from the VTX antenna (opposite arm is ideal)
3. Position the receiver antenna as a vertical element — zip-tied to a standoff or zip-tie “antenna tube”
4. Keep the antenna’s active element (the stripped end) straight and clear of carbon fiber

## Step 7: Pre-Power Checks — The Smoke Stopper

This is where builds live or die. **Use a smoke stopper on first power-up. Always.**

1. Plug the smoke stopper between your battery and the XT60 pigtail
2. If the smoke stopper lights up bright and stays bright, you have a short — unplug immediately and use a multimeter to find it
3. If it lights briefly and dims, you’re good — the capacitors charged normally

### Multimeter Continuity Test

With NO battery connected:

1. Set multimeter to continuity mode
2. Probe between the positive and negative battery pads on the ESC
3. You should hear a brief beep (capacitor charging) then silence
4. If you hear a continuous beep, you have a short — check all solder joints for bridges

## Step 8: Betaflight Configuration

### Firmware and Basic Setup

1. Connect USB to the flight controller
2. Open Betaflight Configurator (10.10.0+)
3. Flash the latest stable firmware for your FC target
4. On first connection, click “Apply Custom Defaults”

### Essential Settings

### Motor Direction and Order

1. Go to Motors tab
2. Check the “I understand the risks” box
3. Plug in a battery (with smoke stopper on first test)
4. Spin each motor individually — it should match the diagram in the Motors tab
5. If a motor spins the wrong direction, use the “Motor Direction” wizard (Betaflight 4.3+) or reverse it in BLHeliSuite
6. Verify correct motor numbering — slider 1 should spin the rear-right motor, slider 2 front-right, etc.

## Step 9: Final Assembly

1. Place the top plate and secure all standoff screws — tighten firmly but don’t strip
2. Install battery pad (the sticky rubber grip pad on the top plate)
3. Thread battery straps through the frame slots
4. Add zip ties to secure loose wires away from props
5. Mount props: CW and CCW labeled — match the diagram on the prop hub
6. Tighten prop nuts firmly — loose props eject mid-flight

## Step 10: First Flight

1. **Arm without props first** — spin motors at minimum throttle, verify they all spin
2. Install props
3. Go to an open field — no people, no cars, no trees within 50 meters
4. Arm, throttle up slowly to 20%
5. Hover at eye level for 10-15 seconds
6. Land, check for hot motors or loose screws
7. Fly a gentle circuit — congratulations, you built a drone

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*Ready to expand your build knowledge? Learn how to read flight controller pinouts and wiring diagrams so you can move beyond pre-made wiring harnesses and build truly custom quads.*

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