The Bastard Kwad header

The Bastard Kwad

The Bastard Kwad is my first attempt at building a freestyle quadcoptor. I've chosen to name it The Bastard because as my first freestyle quad, I'll no doubt be crashing all the time and breaking a lot of stuff, so the thing will not doubt also get called a bastard constantly, so I may as well make it official.

I am doing this on a low budget, so most of the parts are coming from Banggood. I know some people frown upon this, but I can't justify spending 3 times the price on some parts until I'm a proficient pilot. After flying the Mavic Pro, I enjoyed the hell out of flying around in sport mode, so I wanted a cheap freestyle/racing FPV quad to play with instead of risking an expensive quad by flying fast and wrecking it. I had 2 options, buy an Eachine Wizard X220S (which has a good rep as a starter quad) or build my own. I decided to build my own as I think I could do it for similar money to the X220S, pick the parts I wanted, and get experience and knowledge of building quads. At the moment I'm getting the parts I need, and as I order them I'll list them below along with a link and cost. The Eachine Wizard X220S costs £140.67 at the time I was ordering parts.

Part Part bought (link) Why? Thoughts Price £
Frame Realacc Martian II 220mm 5" Because its similar to the Wizard, and a copy of the Alien. Nice frame, just wish they would include a brace as well as the stock PDB. £21.04
Props DalPROP Cyclone 5045 &
HQ Durable PC Props 5043
Good reviews. £13.10 (6 sets of DALs)
£6.10 (2 sets of HQs)
Motors Racerstar 2306S 2400kV Racing Edition Seemed like the right size and power for freestyle at the right price. £26.07
Under motor LEDs Eachine LEDs (red) &
Matek LEDs (blue)
Because I'm a tart! £1.27 (Eachine)
£2.36 (Matek)
ESCs Racerstar MS Series 35A BLHeli_S ESCs - DShot Ready Was going to get the 30A 4in1 from Racerstar, but it had bad reviews whereas these are highly rated. They are also DShot 600 compatible. £29.48
Power Distribution Board (PDB) Matek HUBOSD8-SE I was stupid and didn't research my FC enough so didn't realise there was a version with OSD. This PDB has an OSD plus can more than handle the amps of the ESCs. I'd have probably gone with a different PDB had I ordered the other FC. £12.47
Flight Controller (FC) CC3D REVO F4 Was a well rated FC, just wish I'd seen there was a version exactly the same, only with an OSD for an extra £2. I would have got the Omnibus F4 instead. Seems decent so far. A couple of problems flashing, but even a complete newb who's never done it before (me) got it done. £17.73
Receiver FrSKY XSR I got the XSR over the FrSKY X4R-SB due to its smaller size and equal range after altering the antenna shielding. That and Banggood had them on sale for £13.50!! I found that it doesn't matter which X(S/4)R receiver you get as you can upload the firmware you need directly from the Taranis. You just need to make a cable to connect the 2, and flash the receiver to the firmware you need. £13.50
Transmitter FrSKY Taranis X9D Plus It was a close call between the X9D Plus and the Q X7, but in the end I bought a 2nd hand X9D Plus. £125.00
FPV Camera 650 TVL 2.5mm Lens SuperHad II CCD FPV Camera Cheap but has good reviews. £17.31
Video Transmitter (VTX) FT48X 5.8Ghz VTX with adjustable power Seems like a decent VTX, with a band display and the ability to change signal strength. £17.73
FPV Antenna Foxeer 5.8Ghz 3dBi Antenna I'm sure Joshua Bardwell gave this a good rating for a cheap antenna. £6.32
FPV Goggles Eachine EV100 FPV Goggles I pre-ordered these without seeing any reviews because they were an absolute bargain! Since ordering, I've seen a couple of reviews and the opinions seem to be good, very good if you got them at the pre-order price. They are currently priced at £122.54 with a 54% discount. £70.70
Sub Total *
* Does not include receiver, transmitter, batteries, or FPV goggles as they are not included with the Wizard either.
£170.98
Total £380.18

Final Thoughts

Overall the spec is fairly similar to the Wizard 220S, however I have a few components I feel are better and the frame is full carbon, not carbon skins with a fibreglass centre. To me the extra £30 is worth it for the building experience, slightly better parts, and the knowledge that there won't be any flakey aspects to the build, which the Eachine seems to be plagued with.

I will be releasing a build video at some point; but until then, here's the maiden flight.

My base setup script

Here is the diff dump from my BetaFlight setup.

BetaFlight Version
# name name Bastard # feature feature -RX_PARALLEL_PWM feature RX_SERIAL feature TELEMETRY feature LED_STRIP # beeper # beacon beacon RX_LOST beacon RX_SET # map # serial serial 0 32 115200 57600 0 115200 serial 2 2048 115200 57600 0 115200 serial 5 64 115200 57600 0 115200 # led led 0 4,15::C:10 led 1 5,15::A:0 led 2 6,15::C:11 led 3 7,15::CT:2 led 4 8,15::CT:2 led 5 9,15::C:11 led 6 10,15::A:10 led 7 11,15::C:10 # color # mode_color mode_color 6 0 5 # aux aux 0 0 0 1300 2100 0 0 aux 1 13 2 1700 2100 0 0 aux 2 15 2 1300 1700 0 0 aux 3 35 1 1700 2100 0 0 aux 4 39 0 900 1300 0 0 # master set acc_calibration = 39,55,-83 set mag_hardware = NONE set min_check = 1000 set max_check = 1999 set rssi_channel = 12 set fpv_mix_degrees = 35 set serialrx_provider = SBUS set blackbox_device = NONE set motor_pwm_protocol = DSHOT600 set bat_capacity = 1300 set small_angle = 180 set pid_process_denom = 1 set osd_units = IMPERIAL set osd_warn_core_temp = OFF set osd_cap_alarm = 1500 set osd_alt_alarm = 0 set osd_vbat_pos = 2049 set osd_rssi_pos = 2074 set osd_tim_1_pos = 12 set osd_tim_2_pos = 2066 set osd_vtx_channel_pos = 2552 set osd_mah_drawn_pos = 2529 set osd_craft_name_pos = 2539 set osd_warnings_pos = 2505 set osd_avg_cell_voltage_pos = 2057 # profile profile 1 set dterm_notch_cutoff = 0 set iterm_relax = RP # rateprofile rateprofile 0 set roll_expo = 20 set pitch_expo = 20 set yaw_expo = 20 set roll_srate = 75 set pitch_srate = 75 set yaw_srate = 75 Copy CLI code Hide Comments

You can copy and paste this into BetaFlight's CLI. Remember to enter SAVE afterwards.