Realacc RFX185 (aka QAV ULX)

By wrong17 on Jun 03, 2018

6  338  0

The revival of Realacc RFX185 (aka QAV ULX)! After moving from Spektrum to FrSky I never replaced the RX for this frame, so it just hung on the wall of my garage for a while. A bit has changed since I first built this frame, so I was able to trim some fat off my setup. Now I am using a lighter Camera, VTX and RX. Because of these items are smaller and lighter I was able to remove some extra mounting hardware too. I was able to trim about 33g of excess weight. I plan to replace the stainless-steel cap screws to Titanium button heads, so I should lose a few more grams there.

During my first maiden flight with stock Butterflight PIDs this thing was on rails!!! I could not believe how well if flew, it was like flying a 3inch quad. This might be an older clone of a QAV ULX but it flies great.

Just for fun I did a few speed runs and the best pass that was caught on the radar gun was 77mph:

Photos

Part List

Frame

Realacc RFX185 RFX160 4mm Carbon Fiber FPV Racing Frame RC Drone w/ 5V & 12V PDB Supports 4-5 Inch Prop (5 builds)
Banggood.com
$20.19

Flight Controller

DYS F4 Flight Controller (Poker Face) (140 builds)
Getfpv.com
$38.99

ESCs

DYS F30A 4-in-1 ESC BLHeli_S Dshot (74 builds)
Getfpv.com
$44.99

Motors

4 x DYS SE2205 2300 KV Special Edition FPV Racing Motor (5 builds)
Fpvheadquarters.com
$51.96

Propellers

DAL 5x4.6 - 3 Blade, Black Cyclone Propeller - T5046C (Set of 4) (391 builds)
Getfpv.com
$1.99

FPV Camera

Foxeer Predator Micro Pro 1000TVL 1.8mm 110 Degree M8 Lens Super WDR FPV Camera With OSD DC5V-40V Low Latency - Blue
Heli-nation.com
$36.90

FPV Transmitter

Eachine VTX03 Super Mini 5.8G 72CH 0/25mW/50mw/200mW Switchable FPV Transmitter (417 builds)
Banggood.com
$12.22

Receiver

FrSky R-XSR 2.4GHz 16CH ACCESS/ACCST Micro Receiver w/ S-Bus & CPPM (936 builds)
Getfpv.com
See Site

Batteries

AHTECH Infinity 1500mah 14.8V 90C 4S1P Race Spec Lipo Battery for RC Drone (24 builds)
Banggood.com
$28.18

Radio

Team BlackSheep TBS TANGO 2 V3 PRO RC RADIO (104 builds)
Heli-nation.com
$199.99

Goggles

DJI Goggles 2 (7 builds)
Racedayquads.com
$648.99

HD Camera

GoPro Bones - HERO10 Black (FPV Lightweight Drone Camera) (3 builds)
Gopro.com
See Site

Battery Charger

HOTA F6+ 1000W 60A 1-6S Quad Channel AC/DC Smart Charger - Grey
Racedayquads.com
$185.99

Battery Charger

HOTA D6 PRO Dual Charger 1-6S AC200W/DC650W 15A w/ Wireless Cellphone Charging - Black (14 builds)
Pyrodrone.com
$117.98

Soldering Iron

TS100 Portable Programmable Smart Soldering Iron (264 builds)
Racedayquads.com
$58.99

Backpack

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

Accessories

iFlight Crystal HD Patch and Stubby 5.8GHz RP-SMA Antenna Set for DJI - LHCP - Carbon
Racedayquads.com
$56.99
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