Source One 7”

By granola on Aug 16, 2021

5  374  1

Built this from my original 5" Source One by adding 7" arms and Emax Eco II 2807 motors. The build is designed around running a 4S 4200mah li-ion pack to achieve 5-mile round-trip distances at moderate cruising speed.

Frame is using shorter standoffs than stock, and deadcat arms in the rear with normal arms up front. This was originally because I only ordered 2 deadcat arms, but it turns out that the props aren't in view after processing in RealSteady GO, and the normal front arms leave more clean air for the rear props in this configuration.

Running a 4S 4200mah li-ion pack (Molicel 21700 P42A), I get 10-15 minutes of flight time. That allows me to cover 5+ miles on a single pack. The horizontal Crossfire antenna placement isn't ideal, and I do get a significant drop in LQ and dBm at my turnaround point, but have yet to actually failsafe (knock on wood).

Current CLI diff:


Part List


RDQ Source One V3 Long Range 7" Frame Kit - 6mm V0.2 DeadCat Arms (15 builds)

Flight Controller

MAMBA F722S F7 Betaflight Flight Controller OSD 5/9V 2A BEC & F50PRO 50A 3-6S Blheli_32 Dshot1200 FPV Racing Brushless ESC for (2 builds)


4 x Emax ECO II Series 2807-1700KV Motor (5 builds)


HQ Prop 7x4x3 Durable Tri-Blade Light Grey (2CW+2CCW)-Poly Carbonate (25 builds)

FPV Camera

Foxeer Predator V5 Micro Full Case FPV Camera

FPV Transmitter

RDQ Mach 3 Video Transmitter 25-1000mW 5.8GHz VTX - U.FL or MMCX (146 builds)


OCP 5.8 - TrueRC Canada (14 builds)


TBS Crossfire Nano Rx FPV Long Range Drone Receiver (1488 builds)


21700 Lion pack by Cosmic Power Co. 4200mAh Li-Ion Battery (Choose 4S or 6S)


FrSky Taranis Q X7 2.4GHz 16CH Transmitter (White) (263 builds)


FatShark Dominator HDO 4:3 OLED Display FPV Video Goggles 960x720 for RC Drone (137 builds)

3D Printed

Rear SMA/GPS Mount

HD Camera

GoPro HERO6 Black 4K Action Camera (Renewed) (33 builds)

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (179 builds)

Radio Module

TBS Crossfire Micro TX V2 (43 builds)
See Site

Battery Charger

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

Soldering Iron

TS100 PORTABLE SOLDERING IRON W/XT60 Power Cable (26 builds)


Mini All-In-One Hex Driver Tool (3 builds)


RDQ FPV Backpack - Choose Your Version (8 builds)
Show stores (9)


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gitareest   Sep 21, 2021  

Nice build! Have you tried 6s battery with 1700kv motors?

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