How to build a Sub250g FPV drone with DJI O3 // Quadmula Siren F35 / F3

Based on this build by Murders FPV which is what started my build journey so check it out -    • Quadmula Siren F3 Split: The Tiny Bea...  

This is a step by step how to video to help you build your own FPV drone. It’s a 3.5inch Sub250g, freestyle quad with DJI O3 and although these aren’t the cheapest parts, they are high quality and easily available in most countries… they also make the build extremely easy.

I’ll not only show you how I build this quad, but I’ll also take you through the Betaflight configuration and set up all the way through to your first flight.

If you're new here, I've been flying the 3inch version of this (the Siren F3) for the last year, it quickly became my favourite quad and is the closest I've had to a 5inch in a Sub250g package. As soon as Quadmula announced the Siren F35 I couldn't wait to try it out and since recording this video this has become the quad I run daily.

Disclosures:
I am not sponsored by any of the companies/ brands featured in this video, I haven't received a discount or free parts in exchange for creating this video. These are the parts I would typically use for builds. I've listed all the parts I've used below with non-affiliate links, this is partly because I'm too lazy to set them up but also because these parts aren't cheap and I want you to be sure that I'm not gaining anything by you buying any of the parts in this video.

If you do want to support me or the community, go check out MurdersFPV's channel and use his links for this build as he's the reason I started and now love building these quads!

PARTS LIST (All are non-affiliate links)

Quadmula Siren F35 Split https://quadmula.com/products/siren-f...
Quadmula Siren F3 / F35 3D prints https://www.printables.com/model/3141...
Quadmula DJINN 25 DJI antenna print https://www.printables.com/model/6169...
Flywoo DJI O3 Lite https://flywoo.net/products/flywoo-na...
T-motor F7 Mini stack https://store.tmotor.com/product/mini...
T-motor 1604 2350kv Motors https://store.tmotor.com/product/p160...
HQ Prop 3.5X2.8X3 https://www.hqprop.com/hqprop-35x28x3...
Battery GNB 380mah 6s https://www.gaoneng.shop/products/gao...
BetaFPV - 180mm Strap https://betafpv.com/collections/anten...
TBS Crossfire https://www.team-blacksheep.com/produ...
TBS mini mortal antenna https://www.team-blacksheep.com/produ...
XT30 18 AWG Pigtail https://www.getfpv.com/xt30u-18awg-ma...
Titanium screws - It’s an Ali express link but quick to deliver and great quality https://chinatiscrew.de.aliexpress.co...

Time stamps

00:00 - Why this FPV Build
01:35 - Tools needed
02:54 - Parts needed
10:30 - The Siren F35 frame
18:20 - Add the DJI O3
23:44 - Attach the camera
25:18 - Add stack dummies
27:51 - Dry fit the stack
28:42 - Prep the ESC
31:12 - Prep the FC
33:18 - Solder the beeper
33:48 - Crossfire receiver
40:56 - Repinning the O3
48:28 - Solder the pigtail
52:51 - Add the motors
56:19 - Solder the motors
58:02 - Add antennas
01:02:13 - Screw down the stack
01:05:24 - Test with Multimeter
01:06:10 - Smoke Stopper
01:07:05 - Final adjustments
01:09:47 - Weight Check 1
01:09:59 - Adding protection
01:11:51 - Final weight check
01:12:29 - Bind to Radio
01:13:14 - Activate DJI O3
01:13:35 - Betaflight set up
01:27:31 - Hover Test
01:29:23 - First Flight