The 'Mayfly' Longrange sub 250g 4" Li-Ion 2S

By jeffcd on May 10, 2021

16  1,120  7

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:

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

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

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LazyBird   May 28, 2021  

frame looks awesome! how long did ot take

jeffcd   May 28, 2021 

Thanks. I'm not sure, but it probably took me about a week to design a couple hours here and there after work. Maybe a week or so before that sort of researching ideas and sketching up ideas.

Wooli   May 20, 2021  

Clever build ! would you share your pids and filter setting ? i m in trouble with similar setup in 2s ( but heaviest)

jeffcd   May 21, 2021 

Thanks! I added my current PID settings to the build.
I didn't spend a ton of time tweaking these, but it seems to fly ok with these settings.

Wooli   May 24, 2021 

thanks ,

Polymerization   May 19, 2021  

That is a really good idea, I think 2s 18650 for under 250g needs more attention. Nice build and frame design!

jeffcd   May 19, 2021 


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