Twig XL - Sub 250g freestyle build

By sp_fpv on Aug 02, 2022

4  46  0

Description:

This is probably the fourth revision of this build.
Sub250g freestyle drone designed for acro fliying while carrying the caddx peanut hd camera and don't compromise flight performance:
all the details below (auw, flight time, etc...) include the hd cam as a part of the drone.
Super snappy response and good throttle resolution (~7:1 thrust to weight ratio).
I'm using betaflight 4.3.1 and bluejay 0.16 (@24khz)
...and some titanium screws for weight savings.
This build was a bit tricky because this frame is intended for a 26x26mm aio (which i have used in the past) and i had to adapt it for a 20x20mm stack.

Stats (4s 750mah pack):

AUW: 249g :D
Flight time (hard freestyle): 4:30 to 5:00

Motors suggestion:

Motors i've tried so far with 4S LiPo:
iFight Xing 1404 3800kv -> too small stator, slugghish response
Diatone Mamba 1505 3800kv -> good alternative to my favourite below
Xnova 1804 3500kv t-mount -> good-ish but not durable (they failed pretty soon - shaft started slipping from the bell)
Xnova 1804 3500kv 5mm shaft (RM1804) -> it weighs a ton and eats batteries for no reason (considering the fact they have less stator volume than 1407 below)
Emax Eco 1407 3300kv -> a bit heavy and underpowered, but not bad
Brotherhobby Tornado T2 1407 3600kv -> perfect: light, thick magnets, very tight air gap and very powerfull
Brotherhobby vy1507 3100kv -> too heavy and underpowered
PS: 5mm shaft it's way more durable and less stressfull than t-mount

Prop suggestion:

Well... Gemfan Hurricane 3520 it's the only 3.5" prop available in 5mm hub.
I wish HQProp comes with 2.5x2x3 and 2.5x2.5x3 in M5 hub.

Battery suggestion:

Tattu r-line 4S 750mah

Tune (default if not specified):

Clean build required.
PIDF
Master multiplier slider: 1.6
I Term slider: 0.65
Stick response: 0
Dynamic damping: 0
Vbat sag compensation: 100%
Dynamic idle: 29
Throttle boost: 0
Anti-Gravity: Off

FILTERS
My FC don't have a BB so here i'm staying on the safe-side,
I will update the configuration as soon as I have one with the blackbox.
Gyro lowpass 1: Off
Gyro lowpass 2: 500Hz PT1 (static)
Gyro RPM filter Harmonics Number: 2
Dynamic Notch Q: 300
Dynamic Notch Count: 2
Yaw Lowpass Filter: Off

Photos

Part List

Frame

TWIG XL 3 (4 builds)
Betafpv.com
$9.99

Flight Controller

Diatone Mamba AIO F411 3-6S Flight Controller w/ 35A 8Bit ESC - 20x20mm (4 builds)
Pyrodrone.com
$61.99

Motors

4 x BrotherHobby Tornado T2 1407- 3600kv
Drone-fpv-racer.com
$89.92

Propellers

Gemfan Hurricane 3520 Durable Tri-Blade 3.5" Propeller (2CW+2CCW) - Choose Your Color (16 builds)
Pyrodrone.com
$2.99

FPV Camera

Foxeer Nano Toothless 2 StarLight Mini FPV camera 0.0001lux HDR 1/2 CMOS Sensor 1200TVL Support OSD F405 F722 FC Control (8 builds)
Banggood.com
$34.97

FPV Transmitter

RUSHFPV Tank Mini 20x20 25-800mW 5.8GHz VTX - MMCX (87 builds)
Racedayquads.com
$38.99

FPV Transmitter

RushFPV Module Micro AGC
Drone-fpv-racer.com
$4.10

Receiver

ELRS Lite Receiver (6 builds)
Betafpv.com
$5.99

Batteries

Tattu R-Line 750mAh 14.8V 95C 4S1P Lipo Battery Pack with XT30 Plug (4 builds)
Genstattu.com
$18.59

Radio

Radio FrSky Taranis X9 Lite S (2 builds)
Aerial-shop.com
$164.11

Goggles

Fat Shark Scout FPV Goggles (10 builds)
Pyrodrone.com
$199.00

3D Printed

Caddx peanut big pod by sp_fpv
Thingiverse.com
See Site

HD Camera

Caddx Peanut Action Camera (2 builds)
Caddxfpv.com
$259.99

Hardware

Standoff M3 Aluminium HEX 5MM X 20MM Black (4 Pack)
Drone-fpv-racer.com
$5.03

Hardware

M3x8mm Titanium Screw - 10pces
Drone-fpv-racer.com
$4.62

Hardware

Lethal Conception - Support stackable pour Caddx Vista sur FC AIO 26x26
Drone-fpv-racer.com
$4.00

Hardware

2 x Vis Titane M2x6mm - 10pces
Drone-fpv-racer.com
$5.96

Misc Parts

Panasonic 470uF 35V Capacitor for ESC Noise Reduction (26 builds)
Racedayquads.com
$1.49

Radio Module

HappyModel ES24TX Slim Pro ELRS 2.4GHz RC Transmitter Module (6 builds)
Racedayquads.com
$47.99

Battery Charger

SkyRC S65 Balance Charger / Discharger 65W 6A 2-4S 230V AC (2 builds)
Skyrc.eu
$33.36

Soldering Iron

Soldering Iron Station with Temperature Control
Tilswall.com
$35.99
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