This is my (TrueStyle) Massive Droner build, 2.5 inches of fury haha, the name was too good to pass up:

Hello everyone, a couple months ago, i was turned on to the hobby of drone racing by watching some youtube videos. I've always wanted to fly one and boy has this hobby peaked my interest. I've now got 2 tiny whoops, got a bnf Lumenier QAV Skitzo Dark Matter, and a KingKong ET115. I picked up a runcam split mini over preorder when it was first announced and then have been looking for a frame to put it in ever since.

That's when I came across UAVFutures review of Catalyst Machine Works new 2.5" Massive Droner frame. From the review it appeared to be everything I've been looking for. And the icing on the cake was that CMW themselves are selling a BNF that come with a split mini, so i knew everything would fit. I basically modelled my build after their bnf with a few changes. With some minor tuning in Betaflight 3.3, this little thing STRAIGHT RIPS BALLS. Seriously i was so surprised, this thing is QUICK.

Build notes:

• The only way i could get this build to fit, was to the 20mm screws that come with the runcam split and come up from the bottom of the frame, then use two of the plastic nuts from the additional parts m2 kit as the separators between each board.
  • see close up stack picture above as an example: so it goes 20mm screw, frame. 2 m2 nuts, zeus aio fc, 2 m2 nuts, first split mini board, brass washer, second split mini board, 2 m2 nuts, vtx, one m2 nut. (Note, don't forget to put the split mini ribbon retention and sd card retention metal pieces on)
  • Don't forget to put the battery strap in place before putting the FC down!
• As turning the little m2 nuts all the way down the bolt can be very time consuming/irritating, i used an extended 4mm socket to speed up the process, note i was still doing it by hand, but it made spinning them all the way down much faster!
• Note that the top board of the split mini and the vtx can be very close, i put thicker electrical tape on top of the split mini under the vtx to prevent any shorts.
  For electronics wiring, on the zeus
  • i used tx3 for s.port (coming from the tiny little inverted port on the r-xsr.
  • i used tx6 for the vtx control cable so that i can change the settings in either the osd or through the lua script
• This was my first build... yea i realize my soldering needs some work :p

Additional notes:

• Using my Taranis Qx7s, the betaflight lua script works great adjusting the vtx settings (using tramp, soldered from vtx to tx6 on the FC).
• SmartPort Telemetry is working over the non inverted s-port on the R-XSR to tx3 on the FC)
• The runcam split can be connected over the additional ribbon cables for control through the radio link, but i have not done this yet)

Tuning Note:

• The stock BetaFlight tune for 3.3 (and previous versions) isn't really designed for a quad this small and will have pretty bad throttle oscillations and prop wash. To fix, start by lowering d, as well as turning off both notch filters. It was surprising how much this helped.
• Another thing you can do, is grab the tune that emax has provided for the babyhawk r from here, I have found it to be a good starting point to begin tuning, and i am still continuing to edit and evolve it with each flight. http://emax-usa.com/emax-babyhawk-race-r-edition-fpv-quadcopter-bnf-frsky/

I wanna say a big thanks to Catalyst Machineworks for making an amazing product as well answering my build questions, as well as Joshua Bardwell and his videos for teaching me most everything i needed for this build. Also thanks to all the lovely people from UAVFutures discord for the tuning help.