A bicopter

By ledimestari on Sep 01, 2018

17  7,347  3

I wanted to learn how to build a bicopter, so I built one!

This was in interesting journey, I saw this frame on banggood and thought to myself that hey, that's something different and I want to make it.
Without giving things much thought I ordered parts for this. I saw from the pictres that this would probably fit 7" props so I chose a low kv motors. 1600kv might not be optimal for 4S but they work.

Alt Tag

Configured this to fly with betaflight which was also probably a bad idea because betaflight was kind of broken when I tried to configure this. I had to submit issue on github but then gevs fixed it for me and gave me a working version of the firmware to get it up and running. Running this on Matek F722 FC, works very well and I'm kind of a fan of their products I guess.

Lots of resource remapping and servo mixing later I got it to work and now it flies pretty well. I have tried bunch of different props and I think these 7" biblades are the best ones. 13min flight time and stable control.

Lot of the parts on this are custom made and 3D-printed. You can get them here:
https://www.thingiverse.com/thing:3078387

The FPV aspect of this however is, at least for now, completely useless because the camera is fixed to the frame which keeps rocking back and forth.

Other problematic thing are the servos. I use cheapo MG90S servos which are not the best in any way. They have a lot of slack and they could be more precise. Some real heliservos or servos with feedback would be great.

Short flight with 7" props.

At the beginning you can see that because I have used trims it tries to correct the position with low throttle and almost flips over. Usually I just punch it to the air when this doesn't happen but because the person filming this was standing kind of close to it I didn't want to do it.
Forgive me my bad landing.

Photos

Part List

Frame

HJ-2502 250mm Wheelbase 2-Axis Carbon Fiber Aluminum FPV Racing Frame Kit for RC Drone
Banggood.com
$32.47

Flight Controller

Matek F722-STD F7 30x30 Flight Controller w/ 32K Gyro, BFOSD, Barometer (28 builds)
Racedayquads.com
$39.99

ESCs

2 x CA$12.95 9% Racerstar RS30A 30A Blheli_S OPTO 2-4S ESC Support 16.5 Dshot150 Dshot300 for FPV Racing RC Toys & Hobbies from (10 builds)
Banggood.com
$25.90

Motors

2 x Racerstar 2207 BR2207S Fire Edition 1600KV 2200KV 2500KV 3-6S Brushless Motor For RC Drone Frame Kit (2 builds)
Banggood.com
$21.98

Propellers

Gemfan 7042-2 Flash Series Prop - 2CW 2CCW (5 builds)
Rotorvillage.ca
$4.99

FPV Camera

Foxeer XAT600M HS1177 600TVL CCD 2.8MM IR Mini FPV Camera IR Blocked 5-22v with Bracket For RC Drone
Getfpv.com
$19.90

FPV Transmitter

DYS MI200MW Pigtail VTX25mW/200mW Switchable 5.8G 40CH AV FPV Transmitter SMA For FPV RC Drone (11 builds)
Banggood.com
$15.86

Antenna

Pagoda-2 Omni Antenna RHCP Kit (36 builds)
Farvew.com
$4.00

Receiver

Cooltech RFASB PPM SBUS 2.4G FASST Compatible Receiver for Futaba T10CG 14SG T12Z T12FG TM-14 (9 builds)
Banggood.com
$23.38

Batteries

2 x Turnigy nano-tech 1300mAh 4S 45~90C Lipo Pack
Hobbyking.com
$39.20

Power Distribution

Matek FCHUB-6S Hub Power Distribution Board 5V & 10V BEC Built-in 184A Current Sensor for RC Drone (85 builds)
Banggood.com
$9.99

Radio

Futaba T8FG Super 2.4G 14CH FASST Transmitter With SBUS 8CH R6208SB Receiver
Banggood.com
$862.25

Radio

CA$55.99 44% FlySky FS-i6 2.4G 6CH AFHDS RC Radion Transmitter With FS-iA6B Receiver for RC FPV Drone RC Parts from Toys Ho (22 builds)
Banggood.com
$40.99

Goggles

Fatshark Dominator V2 FPV Goggles Video Glasses 600x480 VGA
Banggood.com
$410.31

HD Camera

TRIACLE DV 8000ST ACTIONKAMERA - Power.fi
Power.fi
$99.00

HD Camera

GoPro HERO7 Black Action Camera (51 builds)
Getfpv.com
$399.99

Misc Parts

4PCS RJXHOBBY 20mm Battrey Strap 200mm-400mm Black for FPV Racing RC Model
Banggood.com
$3.99

Misc Parts

Beitian BN-880 Flight Control GPS Module Dual Module Compass With Cable for RC Drone FPV Racing (19 builds)
Banggood.com
$17.99

Misc Parts

6X MG90S Metal Gear RC Micro Servo (2 builds)
Banggood.com
$12.59

Video Receiver

Realacc RX5808-PRO-PLUS-OSD 5.8G 48CH FPV Receiver Achilles Open Source W/Cover For Fatshark Goggles
Banggood.com
$59.99

Radio Module

Team BlackSheep TBS Crossfire TX LITE (4 builds)
Heli-nation.com
$149.99

Battery Charger

ISDT D2 200W 24A AC Dual Channel Output Smart Battery Balance Charger
Banggood.com
$139.00

Soldering Iron

MINI TS100 Digital OLED Programmable Interface DC5525 Soldering Iron Station Built-in STM32 Chip (110 builds)
Banggood.com
$53.99

Backpack

Lowepro QuadGuard BP X3 - Drone Backpack for 4 FPV Quad Racing Drones and 15" Laptop w/Exterior Mounts (Black)
Amazon.com
$286.00
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Discussion

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delta_fpv   Sep 07, 2018  
1

imsure you are aware of davids version?

i-man   Sep 01, 2018  
1

Nice job men.
Is it hard to fly with or is it like a "normal" quadcopter?

ledimestari   Sep 01, 2018 
1

It is just like flying a normal quadcopter in level mode, with bad tune.

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