Drone Review: Eachine Nano LR3 drone review - RCDrone

Drone Review: Eachine Nano LR3 drone review



The Eachine Nano LR3 is a very capable ultralight 3-inch micro quadcopter using 2s batteries. It ships with multiple optional external receiver options including FRSKY, FlySky, and TBS crossfire as well.

If GPS fail-safe is configured correctly, the drone is capable to return to the take-off zone autonomously in case of TX signal loss. For its size and weight, the close to 20 minutes flight time is truly impressive.


  • Under 250grams with Insta360 GO2 and 2S configuration;
  • GPS fail-safe RTH;
  • Standard 18650 LI-ION batteries;
  • Excellent battery life;
  • Can carry an SMO 4K, Insta360 GO2, or DJI Action 2 camera;


  • Poorly documented;
  • Slow GPS fixing;
  • VTX button is not accessible.
User Review
3.83 (6 votes)
  • Price/performance ratio:3.8
  • Build quality:3.9
  • Camera & FPV & OSD:3.9
  • Flight performance:3.5
  • GPS function3.2

Eachine Nano LR3 hands-on review

I opted for PNP version (without a radio receiver) because I wanted to install my BetaFPV ExpressLRS Nano RX module. The Eachine Nano LR3 arrived fully assembled with the following accessories: two rubber bands, two sets of propellers + screws, and a camera screw with nuts. As the manufacturer does not include batteries, I asked Aldona Yu to send me a pair of Eachine 18650 2500mAh batteries for the tests.

At a glance

Eachine LR3 has a wheelbase of 144mm and a ‘dead cat’ frame design. Unfortunately, only the arms are made from carbon fiber. The rest of the parts are from plastic. One battery is loaded from the top and the second one from the belly of the drone. It has two 3D printed landing skids that protect the bottom battery. The 18650 LIO-ION batteries are secured to the frame by using two rubber bands. The two batteries are serially connected, which means that you need to load both of them in order to power ON the drone. Remember that the positive end (+) goes in front and the negative end (-) on the rear in the top of the frame, and reversely in the bottom. Missinstalling the batteries can burn out the electronics.

In the comparison picture below, you can see the size difference between this 3″ and the 5″ HGLRC Sector 5 V3. There is also a huge weight difference between them (185g vs 652g with batteries).

3" vs 5" FPV drone comparission

The Hglrc Zeus 5A AIO fight controller is diagonally positioned on the frame, which exposes two of its corners, making them more vulnerable during a crash. USB port and RX soldering pads are easily accessible without the need of thanking apart the drone. The M80 GPS module and 5.8GHz VTX antenna form a tail, making it look like a scorpion. Its 1303.5 4500KV motors are equipped with 3-leaf propellers. If you prefer performance over stability, you can try replacing them with 2-leaf ones. Motor wires are nicely routed and secured with fabric tape to the arms.

Propulsion system

Designed for long-range flight, it comes with a high-power 5.8GHz VTX board. According to your needs, you can toggle broadcast power between 25, 100, 200, and 400mW. The CADDX Nano ANT camera is installed on a plastic bracket with an action camera mount on top.

Flight controller

Price and availability

Besides PNP package that is priced at $174.78, there are available combos with 5 different radio receivers (CRFS Nano V2, FlySKy FS-A8S V2, FrSky R-XSR, XM+ or R9MM OTA). The radio module will cost you extra between $10-$30, depending on the version you opt for. Remember to order along with the drone a pair of Eachine 3.7V 2500mAh 18650 Li-ion and a compatible charger if you don’t own one.

Initial setup, Flight preparation

For sure this drone is not intended for first-time pilots. The included tiny user manual provides only some basic information about the flight controller’s pinout (wiring diagram) and how to adjust VTX parameters (CH & Power). The catch is that you should have access to the FPV transmitter button in order to make all the changes.

Radio receiver wiring

If you ordered PNP version, like me, the first thing you need to do is install your radio receiver. Mine arrived with a pre-soldered SBUS connector, making the process easier. As there is not included RX antenna mount, I opted to zip-tie them to the front arms.

Before installing the props and loading the batteries, you should check the stock settings in the BetaFlight configurator. Here you can set the desired transmitter switch layout and do OSD customizations.

BetaFlight configurator FailSafe

GPS rescue mode can be customized and activated under the Failsafe tab (visible only in Advanced mode!). In case you are flying in a poor-satellite coverage zone, I suggest you set ‘minimal satellites’ to 6. Here is a crucial switch ‘Allow arming without fix‘. Without enabling this feature, you can arm and take-off only after the home point is locked. In case you are indoor, you will need to activate this option.

Flight experience

Firstly I tested some indoor hovering, which proved to be a smart idea. After a few seconds in the air, the OSD suddenly showed ‘RXloss’ and the drone dropped. The same phenomenon happened every attempt. Next, I used my Jumper T-lite controller and ELRS RX instead of the LDARC EX8 and FrSky XM+ which seems to have been the problem.

For take-off, you need to push the throttle to 50%, so you should not expect too much power from this little guy, especially if you install an additional camera. As MarbleKit says it, is like a ‘flying whale’.

With those many flight data (System voltages, Temperature, GPS coordinates, Flight altitude, and Artificial horizon) on the FPV screen, it looks like a real plain’s cockpit :)

It takes more than 2 minutes to fix 6 satellites in my flight location. I even waited 15 minutes and no more than 11 satellites have been found. While GPS flight distance was accurate, the altitude did not seem to be right – it changed from 5 to 180 meters without actually climbing.


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