Knob7

By Pie on Jan 10, 2022

4  53  0

Had my old Mob7 FC RX die, and the backup board refused to flash the brilliant Betaflight performance edition, so i figured it was time for an upgrade. I still wanted the small whoop feel, i mainly run it on 1S for indoor flights, and crusing around.

Grabbed some props, frame, and spare motors for the Aliexpress link (frame) (not sure why its in french lol).
As im converting to using eLRS in all the things i decided to pickup an FC with it inbuild. The happymodel one is not ideal, as it needs a new camera, but i can't be bothered figuring out the mob7's cam/VTX cabling for another FC. (Im new, i get a pass lol). Plus it has everything onboard, ESC, FC, RX, VTX. Just means i can't exactly blow it up.

Im currently using the Gemfan 1635's, and they're working a treat. BF 4.3 gave me a little trouble, as eLRS needed an update to V2.0, i grabbed the file from here and its working a treat.
Bunch of lines on the VTX sadly, i think its due to the eLRS RX, not sure what i can do for a fix.
The CNHL batteries are working well, though they shift around in flight due to it now being a 1s.

Had to chop and rewire the camera cables, just gotta splice two connectors together to get the right plugs on each end. Camera fits(ish), just takes a bit of wiggling and it wont screw in, though it is held tight. The orginal camera cover also still fitted, and while it is a bit loose, i'd take the extra protection.
Also flipped the board 180, as otherwise the VTX antenna is coming out the front of the quad.
Id also highly reccomend the whoop juice board, makes mangaging all those batteries a breeze.

BF 4.3 is also working really well, i slapped on the whoop justice preset and its been working a treat. JESC also flashed without a problem, so RPM filtering and 48KHz as well.

Photos

Part List

Frame

Pièces de rechange pour Drone Mobula 7 V3 FPV, bricolage, cadre, moteur V3 SE0802, hélices à 4 pales pour Mobula7 75mm bwhop7
Fr.aliexpress.com
$37.00

Flight Controller

Happymodel ExpressLRS ELRS F4 Flight Controller AIO 5A 4in1 ESC 5.8G 40CH VTX SPI 2.4GHz ELRS Receiver for RC Drone
Banggood.com
$65.99

Propellers

Gemfan 1635 40mm/1mm 3-blade Propeller - KiwiQuads (2 builds)
Kiwiquads.co.nz
$4.99

Propellers

2 Pairs HQProp Micro Whoop 40MM 1mm Hole 3-blade Grey CW CCW Poly Carbonate Propeller for Whoop FPV Racing Drone
Banggood.com
$3.99

FPV Camera

Caddx Ant 1.8mm 1200TVL 16:9/4:3 Global WDR with OSD 2g Ultra Light Nano FPV Camera for FPV Racing RC Drone (80 builds)
Banggood.com
$21.99

Batteries

6 x CNHL 450mAh 3.8V HV 1S 70C Lipo Battery - KiwiQuads
Kiwiquads.co.nz
$41.94

Batteries

6 x Emax TinyHawk 450mAh 1S Battery - KiwiQuads
Kiwiquads.co.nz
$83.94

Power Distribution

Whoop Juice Transfer Station – 1S Balance Charging Board
Store.fractalengineering.net
$12.99

Radio

Jumper T-Lite 16CH Hall Sensor Gimbals CC2500/JP4IN1 Multi-protocol RF System OpenTX Mode2 Transmitter Support Jumper 915 R900/C (14 builds)
Banggood.com
$69.99

Goggles

DJI FPV Goggles HD Digital 5.8Ghz 1440*810 720p/120fps Low Latency with DVR Compatible With Caddx Vista for FPV Racing Drone RC (110 builds)
Banggood.com
$534.29

Video Receiver

Eachine PRO58 RX Diversity 40CH 5.8G OLED SCAN VRX FPV Receiver for FatShark Goggles (37 builds)
Banggood.com
$34.97

Radio Module

Happymodel ExpressLRS 2.4GHz Slim ES24TX-Lite TX Module (Jumper T-Lite)
Getfpv.com
$36.99

Battery Charger

ISDT Q6 Nano BattGo 200W 8A Lipo Battery Charger Colorful Pocket for 1-6S Lipo Battery (4 builds)
Banggood.com
$32.99

Tools

4 in 1 Hex Driver - Quad Junkie
Quadjunkie.co.nz
$13.00

Accessories

Menace Digital HD Antenna Pack (DigiPack) DJI FPV - Quad Junkie
Quadjunkie.co.nz
$69.00

Accessories

BDI DJI Digidapter Plug & Play Analog Adapter for The DJI Digital FPV System
Newbeedrone.com
$59.99

Accessories

HGLRC Lipo Battery Balance Charger Board Pro 40A XT60 XT30 Plug 2-6S Integrated with Lipo Discharger for IMAX B6 ISDT Q6 Nano HO
Banggood.com
$29.99

Accessories

CellMeter-7 Battery Capacity Checker Tester LiPo LiFe Li-ion NiMH NiCd (2 builds)
Banggood.com
$11.99

Misc Supplies

GNB Battery 11.1V 120C 1550mAh 3S - KiwiQuads
Kiwiquads.co.nz
$34.99

Misc Supplies

CNHL MiniStar 850mAh 14.8V 4S 70C Lipo Battery XT60 - KiwiQuads
Kiwiquads.co.nz
$28.99

Misc Supplies

Ethix Goggle Strap HD Black Logo - Quad Junkie
Quadjunkie.co.nz
$27.90
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