TEST: Eachine tiny QX90

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INTRODUCTION

Here is one of the firt cheap BNF brushed mini-FPV machine, the Eachine Tiny QX90.. First the first, a relatively cheap chinese product includes a powerfull open SPF3 FC board, a compact FPV-Cam combo and an efficient FrSky (D8) receiver module. It’s not a toy, but a real FPV plateform.. Let’s discover the bundle

BOX CONTENT

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+ 1 x Eachine QX90 (with a 1S 600mAh LiPo with microLOSI connector)
+ 1 x Charger cable
+ 4 x Spare props (2 CW, 2 CCW)
+ 2 x Spare motors (1 CW, 1 CCW)
+ 1 x Spare battery
+ 1 x Instruction manual (English)

OVERVIEW

-FRONT VIEW
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-SIDE VIEW
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-REAR VIEW
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The bind button of the FrSy receiver. To bind the quadcopter with your compatible radio, press this button while powering on the radio.

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The antenna is folded Inside.

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-UPPER VIEW
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-BOTTOM VIEW
The battery must be attached via rubber bands. Unfortunatly none of them are given in the bundle.

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Be aware, to fasten well the nylon standoff playing the rol of landing gear… They are easy to loose after shocks.

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-WEIGHT
54g AWG… relatively light for a FPV machine…. equiped of strong 8.5mm motors

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Motors

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Motors are jailed with sillicone pods

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LiPo

A 600mAh 1S LiPo, no discharge mentioned… ending with microLOSI connector

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Camera-FPV module

A 25mW without casing and with a 4 leaves antenna

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The antenna is directly soldered on the camera PCB… and versus time will be damaged with hard crash. No antenna guard …:(

The camera is a 520TVL Cmos camera broadcasting in NTSC format. No switch to turn on PAL. The camera comes with a M7 lens mount with a very large FOV (around 170 degrees). Maybe a better outdoors option is too install more a 120 degrees version.

UNBOXING, CONFIGURATION AND DEMO FLIGHT

In term of configuration in Cleanflight, the default setting uses the AUX1 channel to arm to machine and only the stable flight mode is active. Be aware, the channel order by default don’t match the classic FrSky receiver order (see configuration part).

The machine is first of all flying well with default settings. Maybe some woobles are here after a flip/roll in rattitude. The FPV link is good with a clear image but IMHO a little bit blured and a too wide FOV for outdoors practice.

CONCLUSIONS

PROS

+ SPracing F3 board
+ FrSky (D8) 8CH receiver with really good range
+ 54g AWG
+ Good FPV range
+ 6min of flight times

CONS

– Props can pop out easily
– No rubber band to attach the LiPo
– No prop guards
– No power switch

RCgroups thread: http://www.rcgroups.com/forums/showthread.php?t=2705040

This quadcopter have been courtesy provided by Banggood in order to make a fair and not biased review. I would like to thank them for this attitude.
You can find it actually for 70USD at http://www.banggood.com/Tiny-QX90-90mm-Micro-FPV-Racing-Quadcopter-BNF-Based-On-F3-Flight-Controller-FrSKY-Taranis-X9D-p-1069614.html

23 Comments

  • Kevin says:

    Nice writeup. I will be curious to know how the qx90 compares to the x73.

  • Darren G says:

    Any tips on keeping the props on, yet easy to replace when the time comes? 😀

  • […] test assez sympa de la chose chez Drone Maniac, et notamment la petite vidéo de l’unboxing, réglages Cleanflight et essais en […]

  • Alex says:

    Hi, the manual provided with my QX90 says that you can switch PAL/NTSC using the 6th dip switch on the VTX.

    Great review btw 🙂

  • Pablo says:

    Hello, maybe you can help me with my problem. I received the qx90 yesterday, attached the props guards, plug the battery and flew good.
    Then I take out the stock carbon camera stand and used my own 3d printed. Then i connected to cleanflight (never used this before, I used librepilot), then I think i change some things. what I know for sure is that after that the micro went crazy. Now it´s impossible to fly. I have double checked the pid and everything looks to be ok. THe main difference with what I have seen in a lot of youtube videos is that my PIDs don´t accept decimals.. so I can´t set my Rool I to 0.030, or yaw to 18.5, so it´s writen 30 and 18 for example…
    Could you share your config file of this model so i can restore it ?? (i overwrote my backup… 🙁 )
    THANKS

    • SeByDocKy says:

      Yes take the default config file … available in my post #1 of the RCgroups’s thread

      • Pablo says:

        Thanks!
        This is a little crazy… I have fully wiped the fc, uploaded again the spracing f3 evo firmware (1.13.0), Your backup file has to be with an older versión because is not loading in leanflight, nothing happens…
        Anyway, I have changed the options and pasted pids in CLI with values posted by a lot of users. I checked that the PID values are ok. but now, when i plug the battery… ALL MOTORS START SPINNING!!!!
        Trasmiter correctly configured and working with flysky.
        I have MOTOR_STOP activated, “Disarm motors regardless of the throttle…” activated, and all the other values stock…
        What is happening!!! 🙁
        THANKS

  • Jan says:

    I have the same issue, added a tiny IRange rx, Checked the settings in cleanflight, transmitter etc working fine, but when I connect the battery all 4 motors start spinning, Have I missed some setting?

    • SeByDocKy says:

      Strange … check if set motor_pwm_rate = 1000 in CLI “dump” command

      • Darren G says:

        Motors spinning up happens when you don’t set the motor type to ‘BRUSHED’ also. I believe the default option displayed in the dropdown is ONESHOT125?

    • Pablo says:

      You have to set motor_pwm_rate = 3200 then click enter. Write save and click enter again. It will reboot and that’s it. It really works!!!

  • Giuliano says:

    Seby and readers, what do you think about using Betaflight on QX serie?

    • SeByDocKy says:

      It’s an excellent choice … I am planning to release a “how to” video to install Betaflight on SPF3 evo brushed board

      • Giuliano says:

        It will be great!
        I flashed Betaflight 3.0 and 3.1 but getting very hot motors even if lowering D, messing with PWM rate, PID loop speed, BRUSHED protocol etc. but I’m a beginner so I”m very interested in your thoughts.

        • SeByDocKy says:

          You played with the pwm_rate command too ? It’s known to impact on motor’s heat directly

          • Giuliano says:

            oh yes, tried from 2000 to 32000 with no difference.
            Maybe I should link pwm_rate to proper value of min_throttle/max_throttle and gyro and pid loop speed.
            Too many variables to manage for me at moment.

        • Lonsus says:

          Have the same problem with crazy hot motors.
          Running the Chaoli 2S 820 with Betaflight and Micro Evo Brushed FC.
          Motor_pwm_rate does not make a difference in heat.
          Tried lowering PIDs but that also make no difference.

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