BUILDLOG: LKTR120 V2, a great 80g microFPV machine

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INTRODUCTION

Here are some buildlog element of the second revision of the excellent LKTR120. Now, the V2 includes a 120deg camera with a DVR recording in 720p while broadcasting FPV signal in NTSC format and everything under 80g.

I was planning to produce a full builtlog & configuration for this machine. Unfortunatly, I lost some parts 🙁 … So instead to present nothing, here are some draft elements, I managed to save

SOME BUILDLOG STEPS

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1) Screw standoff

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2) Mount motors

3) Attach landing gear

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4)

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5) ESC installation

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Use some double side tape to secure the ESC installation

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Motor’s connector must be installed as following on the FC

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6) Install the camera & DVR

The camera ribbon must be install above the FC. Some taller standoff would have been great to install both the camera DVR and VTX inside

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I was not able and decided to install the VTX on top

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You can secure the uFL/IPX connector by some hotglue or some liquid electrical tape

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Be aware, the last DIP switch (POW) switches between a 25mW or 200mW in power emmission

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7) Final results

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8) Transmitter End points configuration

Partial Buildlog videos

Here is a small tutortial how to install betaflight

FIRST USAGE

I start with the default Baseflight OS and found some basic PID’s setting to have an almost oscillation’s free machine. The results are already great…. It’s a super machine for sure….

CONCLUSIONS

It’s a super machine for sure. You need a nominal level skill to assemble it and take some extra precautions (to protect motor’s wires, to electrically isolate FC with surrounding parts, to jail everything into the frame). Anyway, I am extremely impressed by this machine. The 720p videos are really good and both the control range & video range great (> 200m without problems).

PROS

+ Less than 80g !!!!
+ Super micro machine !!!!
+ Complete RTF machine
+ Beautiful machine
+ Good 720p/120 deg builtin camera-DVR
+ Compatible with BaseFlight, CleanFlight, BetaFlight

CONS

– Not all element can fit between lower & upper plate (need to increase standoff size)
– Motor’s wire need to be protected
– M2x4mm motor’s screws (prefer some M2x5mm)

This quadcopter have been courtesy provided by Banggood in order to make a fair and not biased review. I would like to thanks them for this attitude.
You can find it actually for 239USD at http://www.banggood.com/Scorpion-LKTR120-FPV-120mm-Racer-Frame-Combo-wNaze32-FC-6500KV-Motor-3A-ESC-VTX-Camera-p-992310.html

14 Comments

  • Onclefly says:

    salut, Seb, cool ton tuto sur ce quad merci 🙂

  • Arno says:

    Bonjour Seb. Merci pour ce tuto, sorti juste aprĂšs la fin du montage de mon LKTR120 (kit identique achetĂ© 198 euros lors d’une promo Ă  durĂ©e limitĂ©e chez BG)… J’ai collĂ© mes ESC sous la plaque infĂ©rieure, j’ai donc pu installer le TX entre les deux plaques. La qualitĂ© vidĂ©o est effectivement trĂšs correcte !
    Dommage pour le framerate de l’image FPV qui chute lorsque l’enregistrement est en marche.
    Peux-tu donner des dĂ©tails sur tes PID ? J’utilise pour l’instant LUXFLOAT sous Betaflight. Ca oscille encore un tout petit peu.

    • SeByDocKy says:

      J’ai pas osĂ© installer les ESC dessous. La solution serait d’avoir des colonnes un peu plus grandes pour tout faire rentrer.
      Il faut que je donne les PIDs mais je voulais rajouter une vidĂ©o pour l’installation de Betaflight. Quelle carte as-tu choisi ? Naze32 par dĂ©fault ?

  • Arno says:

    Oui, j’ai pris le firmware pour Naze32.
    Il ne faut pas oublier de configurer le second port série pour le récepteur radio aprÚs installation.

  • Arno says:

    Hi Seb. I Just realized you made a new video about Betaflight and PID settings. I am going go try those. One other remark would be that the flight time with the stock battery, I only get around 4 minutes. I’ve got four of those 300 mAh but definitively need to try 450 mAh models.

    • SeByDocKy says:

      I got a good 4min-4.5min with the stock LiPo … I am afraid it will be a little bit too much with a 450mAh ? aren’t you ?

  • Arno says:

    I was thinking about the SKU 995590 from BG. It’s 7 extra grams. I currently use some SKU 983972 which are very close to the stock battery appart from the connector (I use some adapter).
    I tried your PID settings but it wobbles quite a bit. I’m still running Betaflight 2.1.6 and will try again with version 2.3.1.
    Here are my PIDs (Luxfloat) if you want to give them a try :
    ROLL P 1.2, I 0,030, D 20
    PITCH P 1.2, I 0,030, D 20
    YAW P 1.3, I 0,060, D 10
    LEVEL 5 0,060 100

  • T. Gill says:

    I bought the lktr120 kit from banggood. It looks like it has everything except the video transmitter and camera. I have played with this thing for hours and can’t make the motors spin. My transmitter is bound and it doesn’t seem to arm. I tried the motor test mode in cleanflight and it didn’t work. I tried different firmwares and no good. I tried changing the arm settings and still no good. I tried different versions of cleanflight – still no good.

    Can someone help me?

    • SeByDocKy says:

      Hi
      1) try to disable oneshot125 for your motor testing in CF.
      2) To arm your quadcopter, you probably need to adapt your end-ponts on your radio profile. Sometime you need that the throttle must go below 1020 while ruddler above 1950…

  • Eugene says:

    Have you calibrated the ESCs? That did the trick for me — I had the same problem.

  • Dandrone says:

    Hi Mr. SebyDocky,
    could you please point me a link to a model.in for devo 7e (only firmware modded, not yet hardware) for this lktr120 kit?
    Thank you!

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