Weemix Xplora prototype (sub 250g digital freestyle and longrange)

By N4V1G4T0R on Oct 09, 2020

16  680  5

This is a sub 250g digital freestyle or longrange prototype drone. It's equipped with a caddix vista (nebula) digital FPV system (cam, VTX, antenna combo), TBS crossfire diverstiy receiver and GPS.
For an analog of this frame, check out https://rotorbuilds.com/build/25089.


The UART6 on the BetaFPV Toothpick F4 V3 is not a "real" uart, it's only soft serial. Therefore it is not recommended to use the "fake" UART6 it for the RC link. You need to have Soft Serial activated (in betaflight), in order to be able to use the soldering pads labeled with TX6/RX6. Additionally, the default resource mapping for soft serial RX11 is set wrong. You need to change the PIN to B10 in the CLI.
resource SERIAL_RX 11 B10

If you flipped the AIO (upside down flip, 0°) like me, which allows is to be closest to the top plate (because, that's used to be on "normal" frames), you also need to remap the motor resources in the CLI to this (just switch motor 13 and 24)
resource MOTOR 1 B06
resource MOTOR 2 B07
resource MOTOR 3 B04
resource MOTOR 4 B05

If you do want to use RPM filtering (which is nice, but not really mandatory as this build is quite clean), make sure to only go for 4k PID Loop and Dshot 300 and have overclocking activated (108mhz is default for this board). You will have to flash the ESC firmware, as the ESC is only BLHeli_S and does not support bidir dshot out of the box. In order to use RPM filters, it is required flash it to an "inofficial" version (Jazzmaverick Edition). Currently Version 16.73 (G_H_25_REV16_73.HEX) is recommended, but 16.9 available at the time. I tested both, and both worked fine. Except, that the poor F411 is quit at it's limits with RPM filtering on (Betaflight 4.2.3).

For the maiden flight the master slider is set to 0,8. Everything else is pretty much betaflight defaults. Later, I tuned it to be a little more "cinematic" and less agressive, more D, lower FF, lower I-term relax. With RPM filters are on, the filters can be reduced in strength for this setup.

I also flipped the caddix airunit (upside down flip, 180°) in order to have the antenna at maximum length. This has some downside effects, but the antenna was most important to me. One of the downsides is, the AIO would touch the airunit this way. To mitigate that, the airunit is mounted with 3mm M2 spacers inbetween AU and plate. To now fit the AU, the upper front 3D printed part (rail holder) had to be mounted under the main plate, instead of on top. That's why pate and rails are not in parallel. Well, I like it that way, but it's not mounted as originally designed. I also just could get a longer antenna. Because another downside is the relatively long power and signal cable, as it has to go all the way to the other end of the AU. I used AWG26 calbes for VBAT and GND to compensate, but I am pretty sure, it does not matter at all.

Take care the motors are with 9mm hole distance, as other 1404 have 12mm.


  • Xplora Frame (Prototype)
  • Caddx Vista (Nebula)
  • 1404 Motor with 9mm hole distance (GEPRC MOTOR 1404 3850KV)
  • BetaFPV Toothpick F4 2-4S AIO FC 20A V3
  • TBS CROSSFIRE DIVERSITY NANO RX (antennas included)
  • 3 Blade Props (BETAFPV Gemfan 16pcs 3016 3-Blade Props with 1.5mm Shaft)
  • M2 screws 20mm, 3mm, 6mm
  • M2 standoffs 20mm
  • 3D printed parts (TPU)
  • Beitian BN-180 GPS

Flight time is at least 8min with 4S 650mA.

Link to some flights:


Part List

Flight Controller

FC/ESC - all in one
See Site


4 x GepRC Motor 1404 mit 3850KV (2 builds)

FPV Camera

CaddxFPV Digital HD Camera Nebula Nano Kit (47 builds)


TBS Crossfire Diversity Nano Rx - FPV LONG RANGE DRONE RECEIVER (96 builds)
Show stores (4)


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ras2k2   Oct 22, 2020  

Hi, Can someone give me a link to this frame please? Thanks

saahbs   Oct 09, 2020  

Very nice! another remix!! I'm loving this style - must build one :)

chawks   Oct 09, 2020  

does the diversity receiver add a lot of range? looks like a great build thought man, what is the prop size?

N4V1G4T0R   Oct 09, 2020 

well, it does not really add range. it just makes the rc link it more relyable. in case one antenna is in a bad position for the reception, the other one kicks in. so, practically, it actually adds range.
it's 3" propsize

daich   Oct 09, 2020  

YES! my xlpora has a sibling! digital too!

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