When comparing Blade Nano QX RTF vs UDI U818A-1, the Slant community recommends UDI U818A-1 for most people. In the question“What are the best quadcopters for beginners under $100?” UDI U818A-1 is ranked 1st while Blade Nano QX RTF is ranked 2nd. The most important reason people chose UDI U818A-1 is:
The drone has a 1280 x 720 px camera attached to it. It's not stabilized, but at this price range the mere fact it has a camera is commendable. The camera comes with 2GB microSD card that can be replaced with up 64GB SD card for recording video.
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Pros
Pro Can hover on its own
The drone uses SAFE (Sensor Assisted Flight Envelope) technology that allows it to hover in place while in stability mode. If you find yourself overwhelmed with controlling the drone, you can just release the sticks on the controller and the drone will automatically attempt to stabilize itself in the air.
Pro Blade guards
The drone has 4 pieces of plastic that extend beyond the propellers that help prevent the propellers from being damaged when flying into objects sideways.
Pro Crashes are safer due its small size
The drone is small and light so there's less risk of breaking the drone or something else when crashes happen.
Pro Comes with spare parts
Replacement blades and canopy are bundled with the drone.
Pro Has an HD video camera
The drone has a 1280 x 720 px camera attached to it. It's not stabilized, but at this price range the mere fact it has a camera is commendable. The camera comes with 2GB microSD card that can be replaced with up 64GB SD card for recording video.
Pro The frame protects the blades
The drone has an impact-resistant frame that can absorb light crashes and protect the propellers.
Pro Has guiding LED lights
There's a strip of LEDs on each side of the battery, a headlight LED and LEDs at each motor pod.
Pro Can do a flip in the air
The drone is capable of making a 360° eversion maneuver when at least 10 ft in the air. To do a flip, press the 360° button on the controller.
Pro Minimal setup time
All you have to do to get started is charge the battery of the drone via USB cable and put 2 AA batteries in the controller.
Pro Replacement rotors are cheap
A set of replacement blades on Amazon costs less than $2.
Cons
Con ~7 minutes of flight time
The drone has a small 150 mAh battery that on average can provide about 7 minutes of flight time.
Con Easily affected by wind
Due to its small size and weight, any gust of wind can knock the drone down.
Con Rigid camera angle
There's no way to change the camera angle.
Con Easily affected by wind
The large frame of the drone acts as a sail during wind making the drone, depending on wind, difficult or simply impossible to control. There's also no way to remove the frame to reduce the effects of wind on the drone.