How to Build a 7-Inch Long Range FPV Drone: Parts List & Step-by-Step Guide
Build a 7-inch long range FPV drone: a matched 6S parts list, GPS and receiver choices, LiPo vs Li-ion, assembly, Betaflight and GPS Rescue setup, and thrust-to-weight and flight-time maths.
- Frame: 7-inch propellers, roughly 300–320 mm motor to motor, stiff 5–6 mm arms, 30.5 × 30.5 mm stack mounting and a place for the GPS.
- Power: 6S with 2807 or 2809 motors at about 1,300KV and 7-inch tri-blade propellers with 3.5–3.7 inch pitch.
- Electronics: F405 or F722 flight controller with five or more UARTs and a barometer, 55–65A AM32 4-in-1 ESC, ExpressLRS receiver and a u-blox GPS.
- Battery: a 6S 3,300 mAh LiPo and a 6S 4,000 mAh Li-ion weigh about the same (around 445 g), but the Li-ion stores about 20% more energy.
- Weight and flight time: about 1.2 kg ready to fly in the example build below, and roughly 15 minutes of cruising on LiPo or 20 minutes on Li-ion.
A 7-inch long range FPV drone gives up some of the punch of a 5-inch freestyle quad in exchange for efficiency: larger propellers, low-KV motors and a big battery keep it in the air far longer, and a GPS module adds position data and a return-home function. This guide covers a complete 6S build, with a LiPo pack for testing and a Li-ion pack for cruising.
Long range FPV drone parts list
The table lists every part the build needs, what to check before you buy, and matching products. The example build uses 6S power and DJI O3 digital video; swap the video rows for the analog option to cut cost.
| Part | What to look for | Matching products |
|---|---|---|
| Frame× 1Drone frames → | 7-inch, 300–320 mm motor to motor, 5–6 mm arms, 30.5 × 30.5 mm stack holes, 19 × 19 mm motor holes, a GPS mounting position | |
| Motors× 4Drone motors → | 2807 or 2809 stator, 1,280–1,350KV for 6S, 19 × 19 mm M3 mount, 5 mm shaft | |
| Flight controller× 1Flight controllers → | F405 or F722, Betaflight target, 30.5 mm mounting, 5+ UARTs for receiver, GPS and video, barometer, 9–10 V BEC | |
| 4-in-1 ESC× 1Drone ESCs → | 55–65A continuous, 3–6S input, 30.5 mm mounting, AM32 firmware for bidirectional DShot | |
| Propellers× 3+ setsDrone propellers → | 7-inch tri-blade, 3.5–3.7 inch pitch, M5 hub | |
| LiPo batteries (testing, windy days)× 2+Drone batteries → | 6S 3,000–3,300 mAh, high discharge rating, XT60 | |
| Li-ion batteries (cruising)× 2+Drone batteries → | 6S1P 21700 cells, 4,000–5,000 mAh, XT60, rated current that covers your cruise draw | |
| GPS module× 1Drone GPS → | u-blox M8 or M10, 10 Hz update rate, UART connection; a compass is optional | |
| Receiver× 1Datalinks, video & radio → | ExpressLRS on the same band as your radio (2.4 GHz or 868/915 MHz), CRSF over UART, 5 V input | |
| Digital video system× 1Datalinks, video & radio → | Air unit and camera that match your goggles | |
| Analog VTX (budget option)× 1Datalinks, video & radio → | 5.8 GHz, switchable power up to 1.6 W, 7–36 V (2–8S) input, MMCX socket, IRC Tramp or SmartAudio control | |
| Analog FPV camera (budget option)× 1 | 19 × 19 mm micro size, 1200TVL class, wide input voltage | |
| VTX antenna (analog or Walksnail)× 1 | 5.8 GHz circular polarization, connector that matches the VTX, same hand (RHCP or LHCP) as the goggles | |
| Radio transmitter× 1 | Built-in ExpressLRS on the same band as the receiver, EdgeTX firmware | |
| FPV goggles× 1FPV goggles → | Same system as the video transmitter | |
| Charger× 1 | Balance charger with LiPo and Li-ion modes, 6S, storage mode | |
| Small parts | XT60 lead (12 AWG), 35 V 1,000 µF low-ESR capacitor, smoke stopper, battery straps and grip pad, M3 hardware, heat shrink |
Send this list as it is and get one price for every part.
Quote the full parts list →Tools you need
- Temperature-controlled soldering iron with a chisel tip, 63/37 rosin-core solder and flux.
- Digital multimeter and a smoke stopper (a current-limiting fuse for the first power-up).
- Hex drivers (1.5, 2.0 and 2.5 mm), an 8 mm nut driver for M5 prop nuts, side cutters and wire strippers.
- Heat shrink, zip ties, double-sided foam tape and blue thread locker.
- A laptop with Betaflight Configurator and the ExpressLRS Configurator, and a small fan to cool the video transmitter on the bench.
Step-by-step assembly
1. Check that the parts fit together
On paper, confirm that the stack and frame both use 30.5 × 30.5 mm holes, the frame's motor holes match the 19 × 19 mm pattern of 28xx motors, the camera and GPS fit their mounts, and every electronic part is rated for 6S. Then count UARTs: the receiver, GPS and video system need one each.
2. Build the frame and mount the motors
Longer arms make a 7-inch more prone to vibration than a 5-inch, so tighten every frame screw firmly and replace a flexing arm rather than tuning around it. Mount the motors with M3 screws short enough to clear the stator windings, with a drop of blue thread locker on metal screws.
3. Mount the ESC and solder the motors
Fit the 4-in-1 ESC on its soft grommets, arrow forward, and solder the twelve motor wires to their pads. The wire order on each motor does not matter; rotation direction is set in software.
4. Solder the battery lead and capacitor
Solder the XT60 lead to the battery pads, red to positive, and a 35 V 1,000 µF low-ESR capacitor across the same pads, observing polarity. Heat-shrink the capacitor legs and keep the thick power wires away from where the GPS will sit.
5. Test before the first power-up
Check with a multimeter that there is no short between the XT60 pins or from either pin to the frame, then make the first battery connection through a smoke stopper.
6. Fit the flight controller and receiver
Mount the flight controller above the ESC and connect the ESC harness. Solder the receiver to a free UART, TX to RX and RX to TX, plus 5 V and ground. Check its firmware before binding: the GEPRC ELRS Nano ships with ExpressLRS 2.x and will not bind to a radio on 3.x until updated. Keep the antenna away from carbon and the propellers.
Need a quote for this? Tell us what you need →
7. Mount the GPS
Put the GPS on top of the frame with a clear view of the sky, as far as possible from the video transmitter and battery wires, and connect it to its own UART. If the module has a compass, leave it disabled for now.
8. Install the video system and finish
The DJI O3 plugs into the flight controller's HD connector and needs 7.4–26.4 V, so it runs from battery voltage or a 9–10 V BEC, never a 5 V pad. For analog, power the VTX from battery voltage and connect its control wire to a spare UART TX pad. Hard-mount the camera in a TPU mount; on a 7-inch, soft-mounting an HD camera can add vibration. Fit the antennas, top plate, strap and grip pad, and leave the propellers off until setup is done.
Betaflight setup and first tests
Flash the firmware target listed for your flight controller, then work through these settings:
- Ports: enable Serial RX on the receiver's UART and GPS on the GPS UART; select MSP + DisplayPort for digital video, or the VTX's control protocol for analog.
- GPS: use the UBlox protocol; Betaflight recommends 10 Hz at 57,600 baud for GPS Rescue. Enable the barometer if fitted, and test rescues with it on and off, as it can drift on long flights.
- Receiver: choose Serial (via UART) and CRSF, bind, and check every stick and switch.
- Motors: DShot600 with bidirectional DShot on (AM32 supports it) for RPM filtering; motor poles stay at 14 for the 12N14P motors above.
- Battery: on Li-ion, set the cell count to 6 by hand. A 6S Li-ion pack below 18.0 V can be read as 5S, and the OSD cell voltage will then read too high.
- Failsafe: put ARM on a switch, add a GPS Rescue switch for testing, and with props off confirm that disabling the radio's transmitter module triggers failsafe.
- OSD: battery voltage, current, mAh used, satellite count, distance and direction home, link quality.
For the first flight, hover low for thirty seconds, land and touch each motor: one much hotter than the rest points to a bent shaft, a damaged propeller or a filter problem.
Set up GPS Rescue before relying on it
- Satellites: Betaflight needs at least 8 to arm with GPS Rescue enabled, and 10 or more is better. Tilt the quad about 45 degrees each way; a module that drops satellites will struggle when the quad pitches forward to fly home. Never enable "allow arming without fix": with no home point, a link loss ends in a disarm and a fall.
- Heading: without a compass, Betaflight learns the heading from the direction of travel. Fly straight forward for several seconds after takeoff; the home arrow should point home within 5–10 seconds, or about 50–80 m.
- Compass: leave it off unless it is calibrated and agrees with a phone compass to within 10 degrees. Even on a 7-inch it is hard to mount one far enough from current-carrying wires.
- Testing: start with switch-triggered rescues at close range over soft grass; flipping the switch back returns control at once. Only then test a real link loss, by disabling the transmitter module in the radio menu, never by switching the radio off.
Calculations: weight, thrust-to-weight ratio and flight time
The example build uses figures from the product pages linked in the parts list.
- Frame 388 g (DolphinRC Lark X7), four FlashHobby A2807 1300KV motors at 55.4 g (221.6 g), flight controller 9.4 g, ESC 13.5 g, DJI O3 air unit with camera 36.4 g plus 3 g antenna, GPS 7.9 g, receiver 0.6 g, four Gemfan 7035 propellers at 6.5 g (26 g), and an allowance of 50 g for wires, XT60 lead, capacitor, screws, strap and mounts.
- Dry weight: about 756 g. With the 445 g Storm 6S 3300mAh LiPo, all-up weight is about 1,201 g; the 446 g Storm 6S 4000mAh Li-ion gives almost the same, about 1,203 g.
- Thrust-to-weight ratio = total maximum thrust ÷ all-up weight. FlashHobby lists 2,036 g maximum thrust for the A2807 1300KV on 6S with a 7 × 3.5 tri-blade, so 4 × 2,036 g = 8,144 g, and 8,144 ÷ 1,201 ≈ 6.8:1, plenty for cruising, climbing and pulling out of a dive.
- Current headroom: each motor peaks at 37.9 A, so four pull about 152 A at full throttle. The 3,300 mAh 95C LiPo is rated for 3.3 × 95 = 313 A; the 4,000 mAh 15C Li-ion for 4.0 × 15 = 60 A, so fly the Li-ion smoothly and avoid long full-throttle punches.
- Flight time (minutes) = capacity (Ah) × usable fraction ÷ average current (A) × 60. Assuming a 10 A average while cruising: LiPo, using 80% of 3.3 Ah, 2.64 ÷ 10 × 60 ≈ 16 minutes; Li-ion, using 85% of 4.0 Ah, 3.4 ÷ 10 × 60 ≈ 20 minutes. Log your real average current on the OSD and redo the sum.
Building a fleet for mapping, inspection or a training school? Request a quote for frames, motors, GPS and Li-ion packs in bulk →
Battery safety and flying rules
- LiPo delivers far more current than Li-ion (around 50C against about 5C), so use LiPo for testing, wind, climbs and dives, and Li-ion for steady cruising. A Li-ion pack's current limit is the cell rating, since cells in series deliver no more current than one cell.
- Land a LiPo at about 3.5 V per cell under load. Li-ion can go to about 3.0 V per cell, but follow the label: GEPRC charges its Storm Li-ion packs to no more than 4.10 V per cell and stores them at 3.4–3.7 V. Charge each pack in the matching mode on a balance charger, in a fire-resistant bag, and never unattended.
- In the US, recreational pilots must pass the free TRUST test, register drones of 250 g or more, and keep the drone within visual line of sight or have a visual observer next to them. GPS Rescue is a safety backup, not permission to fly beyond line of sight.
- In the EU, privately built drones under 25 kg fly in the A3 subcategory: operator registration, at least 150 m from uninvolved people and urban areas, and below 120 m above ground.
- Sub-GHz ExpressLRS comes in a 915 MHz version for FCC regions and an 868 MHz version for the EU; buy the one that is legal where you fly. In some countries, higher-power analog video needs an amateur radio licence.
- For air travel in the US, spare lithium batteries go in carry-on baggage only; packs up to 100 Wh need no approval, and up to two spares of 101–160 Wh need airline approval, which includes the 108 Wh CNHL pack.
Frequently asked questions
What motor KV is best for a 7-inch long range FPV drone?
On 6S, about 1,300KV is the usual choice for a 7-inch, in a 2807 or 2809 size; 4S builds need 1,500KV or more. Small 22xx motors are a poor fit: they lack the torque to change the speed of heavy 7-inch propellers quickly, which makes the quad feel sluggish and prone to prop wash. Compare 2807 and 2809 motors.
Should I use LiPo or Li-ion batteries for long range FPV?
Use both for different jobs. A Li-ion pack stores more energy for the same weight, which suits steady cruising: a 6S 4,000 mAh Li-ion weighs about the same as a 6S 3,300 mAh LiPo but holds about 20% more energy. LiPo delivers far more current, so it is better for testing, windy days, climbs and dives. Check that a Li-ion pack's current rating covers your cruise current.
Does Betaflight GPS Rescue need a compass?
No. Without a compass, Betaflight works out the heading from the direction the drone travels, so fly straight forward for several seconds after takeoff and check that the home arrow points home. Only enable a compass if it is calibrated and agrees with a phone compass to within 10 degrees; a noisy compass makes the rescue worse. A GPS module without a compass is enough.
How long can a 7-inch FPV drone fly?
The example build in this guide works out to roughly 16 minutes of cruising on a 6S 3,300 mAh LiPo and 20 minutes on a 6S 4,000 mAh Li-ion, assuming a 10 A average draw. Heavier Li-ion packs go further: GEPRC rates its MOZ7 V2 at 25 minutes of slow cruising on an 8,000 mAh Li-ion pack. Wind, speed and an action camera all shorten it.
Should I use 2.4 GHz or 915 MHz ExpressLRS for long range?
Both are used on long-range builds, and many ready-built 7-inch drones are sold with either a 2.4 GHz or a 915 MHz receiver. The radio and receiver must be on the same band. Sub-GHz gear comes in regional versions, 915 MHz for FCC regions and 868 MHz for the EU, so buy the one that is legal where you fly. Dual-band receivers can work with either band.
How far can a long range FPV drone fly?
The law sets the practical limit before the hardware does: in the US, recreational pilots must keep the drone in visual line of sight, and in the EU A3 subcategory you stay below 120 m and away from people. DJI rates the O3 video link at up to 10 km (FCC) and 2 km (CE) one way in open space, but battery, wind and the return trip decide how far you can safely go.
Can I use 5-inch parts on a 7-inch build?
Many parts carry over: flight controllers, ESCs, receivers, video systems and goggles from 5-inch builds all work on a 7-inch. The frame and motors do not. A 7-inch needs a stiffer frame with thicker arms, and bigger 28xx motors with enough torque for the heavier propellers.
Should I build a 7-inch or buy a ready-built one?
Building lets you choose every part and repair the drone yourself. A ready-built (BNF) 7-inch saves the soldering and tuning: models such as the GEPRC MOZ7 HD O3 come with motors, GPS and video installed and a choice of receivers. Compare ready-built FPV drones, or ask our team to quote the complete parts list as one kit.