4" Long range sub 250g quadcopter with 1404 3800 KV motors.
This is the first frame I've designed myself. My goal was to make the frame as light as possible and specific for my components.
The bottom plate is 2.5mm thick and top plate is 1.5mm thick. With 20mm standoffs and screws it weighs in at 19.7g.
I designed it with 2S 18650 Li-Ion battery pack in mind, but the dry weight of 99g should allow me experiment with 2S 21700 and 3S 18650 and still squeeze it just under 250g.
I also wanted to make sure it had all the components for long distance missions, so it has a lost model buzzer/light, GPS & barometer.
It also has an ImmersionRC Ghost hybrid board which includes a long range receiver and 600mW VTX on a single 20x20 board, which made the build extra clean.

I designed the frame using Fusion 360 and had it cut by CNC Madness.
Full build log here on intoFPV forum: https://intofpv.com/t-sub250g-custom-ultralight-4-lr-ghost-build

Here's a video from my second full battery flight. 20km total distance and 33 min flight time.

BUILD UPDATE
A few changes to note, since the original design:

• I damaged my IRC hybid board and replaced it with a Ghost Atto Duo RX and Tramp Nano VTX on a whoop proton board
• Added TrueRC Bardpole RX antenna at the front in vertical polarization.
• Moved Ghost qTee antenna to rear in vertical polarization
• Replaced TrueRC Singularity to a Singularity Lite with longer coax to get it up as high as possible