2Fiddy 3.5"

By granola on Apr 19, 2024

3 0 4

First sub-250g build with DJI O3. Chose the 2Fiddy frame since the new version is built to fit the O3, doesn't require additional TPU mounts, and I like the aesthetics. Went with the T-Motor 45A AIO in the hopes that it's quality, and it has the MPU6500 gyro (in addition to the DJI plug). For motors, the 1804s are 1018mm³ in stator volume, which is just about spot on for a 3.5" quad (according to Chris Rosser). I'm running the Tracer RX since that's what I've been using for a few years on all my race quads. And Tattu 750mah 4S packs — they're the same weight as the 650 packs since apparently they're the same packs but with top-grade cells.

Starting with Supafly's 3-4" Freestyle preset, adjusted based on his online PID tune calculator. I'm planning to use the O3 footage vs. running any HD camera (and that has largely the impetus for this build). 2.7k 4:3 @ 100Hz is what I think I'll run, with some of Oscar Liang's suggested "lazy" settings (and then run through a superview script and maybe some mild color grading in Premier Pro). I got some ND filters but I'm not sure if they'll fit.

Added a GPS module for more confidence flying over water, mountains, and other hard-to-reach areas.

Part List

Frame	Ummagawd 2FIDDY Ultra Light 3.5/4" Freestyle Frame V1.5 (Fits DJI O3) Pyrodrone.com	$59.99
Flight Controller	T-Motor F7 45A AIO Flight Controller - 25.5x25.5 Pyrodrone.com	$119.00
Motors	4 x RCINPOWER GTS V3 1804 3450KV Brushless FPV Drone Motor - Teal Blue/Pink Pyrodrone.com	$79.96
Propellers	HQ Prop T3.5X2.5X3 Tri-Blade 3.5" 1.5mm T-Mount Prop Grey (2CW+2CCW) - Poly Carbonate (2 builds) Pyrodrone.com	$2.79
FPV Camera	DJI O3 Air Unit FPV Camera Module (10 builds) Pyrodrone.com	$109.00
FPV Transmitter	DJI O3 Air Unit Transmission Module (25 builds) Pyrodrone.com	$169.00
Receiver	Team Blacksheep TBS Tracer Nano RX (15 builds) Pyrodrone.com	$29.95
Batteries	Tattu R-Line 4s 750mAh 95C Lipo XT30 (2 builds) N-factory.de	See Site
Radio	RadioMaster TX16S MKII MAX AG01 Pyrodrone Edition - Carbon Face Plate, Pyro AG01 Gimbals, Blue/Orange CNC parts, Black Leather G (3 builds) Pyrodrone.com	$389.99
Goggles	DJI Goggles 2 - Ultra Low Latency 1080p/100FPS 4K/60FPS Digital HD FPV (20 builds) Pyrodrone.com	$449.00
3D Printed	2fiddy Blank Mount by PinkBatman Thingiverse.com	See Site
Hardware	NewBeeDrone M10Q Micro GPS Module with Compass Pyrodrone.com	$19.99
Misc Parts	Camera Butter ND Filter 2 Pack for DJI O3 Air Unit Camera - ND8/16 Racedayquads.com	$24.99
Radio Module	TBS Tracer Micro TX - FPV Racing Drone Transmitter (7 builds) Team-blacksheep.com	$69.95
Battery Charger	HOTA D6 Pro 325W 15A 1-6S Dual Channel AC/DC Smart Charger w/ Wireless Cellphone Charging - Choose Your Color (54 builds) Racedayquads.com	$117.99
Soldering Iron	TS100 Digital OLED Programmable Interface Mini Soldering Iron (264 builds) Getfpv.com	See Site
Tools	RDQ All-In-One Driver Tool (3 builds) Racedayquads.com	$29.99
Backpack	RDQ FPV Backpack V3 - Black Stealth Racedayquads.com	$79.99
Accessories	FatStraps 2" FPV Goggle Strap for Fatshark, Walksnail or DJI - Choose Your StyleHD Thin (Snap Loop) / Khaki Mil Spec Racedayquads.com	$24.99
Accessories	NewBeeDrone Max Comfort Goggle Foam for DJI Goggles 2 and Integra Pyrodrone.com	$11.99

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Discussion

BigBeard.fpv 14 days ago

how does it fly? do you have any flight footage ?

granola 14 days ago

I'll share some flight footage later today!

granola 13 days ago

Verdict: flies great! There's some headroom for more tuning, but it's great as-is already. Footage from maiden flight test:

granola 11 days ago

And here's the same video but with Gyroflow applied in post:

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