BD1 "Chimera" - Open source FPV 2.2" drone

BD1 “Chimera”

Made in Poland

Chimera is 2,2" freestyle cinewhoop type drone, for 3S batteries, with fully 3D printed construction

• Ready-to-flight mass(with lamp, battery and wings) : <200grams

• Carry weight : Can fly with light action camera

• flight time : 1,5 - 5min

*Speed can be reduced in edgeTX system using logical switch based on the speed read from GNSS, and the mix function. The project includes a configuration that limits the speed when SB is UP

Youtube Video:

Youtube Video

3D printing

All on 0.4 brass nozzle, make sure you have at least 5 pieces- CF filaments will wear off quickly. Trim Z-offset after every CF print

I don't recommend using SS nozzle becouse it's too cold for my printer.

watch out!

I'm updating this project often here, for best and actual files please visit my repo. There you can find most actual description and files:
https://github.com/bartoszp1992/chimeraDrone

tips/info

please use proper materials. Drone components will be hot or very hot. Printing parts with PLA or similar will cause melt your construction during flight. If my cheap Sidewinder X4 printer can handle this materials- yours printer also can.

It's not cheap project- don't do it because of lack of funds. Buying a ready frame will be cheaper than buying CF filaments

one battery for one 2-3 minutes flight. Make sure you have more than 1

parts

• duct-R : PA12, 3 wall loops, tree supports(add exception for strap channel), 10-30% honeycomb infill, rotate 180deg in X axis(upside down). after print heat and bend down the wing trims by 90 degrees

• frame : PC-CF, 2 wall loops, no supports, 100% grid infill, rotate 35deg in Z axis

• body : PETG-CF, 3 wall loops, tree strong supports, 100% grid infill

remove supports under side vent pockets, camera axis holes, right tail vent pocket, VTX ant cable hole

• wings : PLA GLOW, 3 wall loops, 80%, no supports, rotate 90deg in Y axis, to make sure base is parallel to table

• cable mounts : TPU A95, 100%, 3 wall loops, X90 deg, Y-45deg

• roof/mount roof : TPU A95, 100%, 3 wall loops, Y90 deg, tree support

set top support interface spacing 0.2mm to get nice look

• GNSS mount : TPU A95, 3 wal loops, X90 deg

• Grip nuts, sleeves : PETG, 100%

• cable lock : PETG, 100%, X90 deg

BOM

3D printed

• 1 x duct-R

• 1 x body

• 1 x FDM frame

• 1 x left wing

• 1 x right wing

• 4 x cable mount

• 1 x roof or mount roof

• 1 x GNSS mount

• 1 x cable lock

• 4 x camera sleeves

• 4 x FC sleeves 2mm

• 4 x FC sleeves 3mm

• 4 x grip nuts

electronic

• [ ] FC : GEPRC TAKER G4 35A AIO

you can use any other 20A+, compatible with 3S and 25,5mm pitch

• [ ] propellers : GEMFAN 2218 3-blade Propellers (1.5mm shaft)

• [ ] motors : BETAFPV Lava series 1104 | 7200KV Brushless Motors

• [ ] receiver : SpeedyBee Nano 2.4G ExpressLRS ELRS Receiver

or any other ELRS receiver which can fit into modules mounts in body

• [ ] camera : Foxeer Cat 3 Micro(19x19mm) or other analog camera

• [ ] VTX : Foxeer Reaper Nano V2 VTx 5.8G 72CH 350mW Tramp

• [ ] Video antenna : Speedy Bee 5.8 GHz Antenna V2 UFL

• [ ] battery : LAVA 3S 550mAh 75C

• [ ] GNSS : Foxeer M10Q-180 compass

• [ ] Controller : Jumper Bumblebee, or any other with ELRS and edgeTX

• [ ] Goggles : BETAFPV VR03 or any other analog goggles

• [ ] VRX antenna : Any RHCP antenna

• [ ] Charger : iMax B6 V2 with some 12V supplier / ToolkitRC Q4AC

• [ ] 5A car fuse and cable socket : charging fuse

• [ ] some drone lamp : if you want make night flies

• [ ] 2 x additional XT30 connectors set : to connect battery to charger and FC

• [ ] red and black 18AWG silicon wire cables : to make connection with FC

• [ ] 25-30A car fuse and cable socket : not necessary, but recommended

mechanical

• [ ] 1x 10x130mm battery velcro strap

• [ ] 8x 20mm M2 screws with barrel head for stack mount, and wing mount

make sure you have spares- these screws can bend after hard landing :joy:

• [ ] 4x 10mm M2 screws with barrel head for body mount

• [ ] 12x M2 H3 D3.6mm brass insert

you can recover it from broken parts, but make sure you have spares

• [ ] 4x M2 1,6mm nut to lock stack screws

technical drawing

todo list

• [ ] make case

• [x] make assembly file

• [x] fix assembly errors

freeCAD bug- fixed by workaround

• [x] record night fly

• [x] record full power flight

• [ ] make assembly manual

• [x] change FC pitch to 25.5x25.5mm

• [x] add fuses to BOM

• [ ] include Rx firmware

• [ ] include Tx firmware

• [x] include betafpv F405 firmware

• [x] include geprc taker firmware

• [x] fix GPS speed log on controller lag(ELRS script in controller- telemetry ratio)

• [x] fix stability on fast yaw

• [x] find throttle value for auto-land

• [x] set altitude and speed alarm

source files

https://github.com/bartoszp1992/chimeraDrone

BD1 stands for "Bart's Design 1"