Centos

By nic4wtf on Jan 28, 2021

22  512  12

Attempt to go really fast.

Unfortunetly didn't worked as planned.
V2 coming soon.

Photos

Part List

Flight Controller

Diatone Mamba F405 Mk2 F40 Mk2 3-6S 30x30 Stack/Combo (F4 FC / 40A 4in1 ESC)Default Title (176 builds)
Racedayquads.com
$66.99

Motors

4X Racerstar Racing Edition 2306 BR2306S 2400KV 2-4S Brushless Motor For X210 X220 250 for RC Drone FPV Racing (9 builds)
Banggood.com
$35.49

Propellers

EMAX Avan S 5042 Bi-Blade 5” Prop 20 Pack - Choose Your Color (6 builds)
Racedayquads.com
$7.49

FPV Camera

Foxeer Arrow Micro Pro 1/3" CCD 2.1mm 4:3 600TVL PAL/NTSC FPV Camera with OSD Black/Blue/Red (240 builds)
Banggood.com
$20.70

FPV Transmitter

Eachine VTX03 Super Mini 5.8G 72CH 0/25mW/50mw/200mW Switchable FPV Transmitter
Getfpv.com
$9.59

Receiver

Frsky XM+ Micro D16 SBUS Full Range Mini Receiver Up to 16CH for RC FPV Racing Drone (1514 builds)
Banggood.com
$13.69

Batteries

2 x Tattu 11.1V 3S 850mAh 75C LiPo FPV Battery - XT60 (12 builds)
Racedayquads.com
$29.00

Radio

FrSky 2.4G ACCST System Taranis Q X7 16 Channels Transmitter Remote Controller White Battery and Battery Trays Not Include (253 builds)
Amazon.com
$124.99

Goggles

FatShark Dominator V3 RTF Bundle FPV Goggle with OLED Receiver Battery Case for RC Drone (63 builds)
Banggood.com
$299.99

HD Camera

GoPro HERO5 Session (296 builds)
Getfpv.com
$199.99

Misc Parts

RDQ Micro M8N GLONASS GPS Module (67 builds)
Racedayquads.com
$15.99

Radio Module

FrSky R9M 900MHz Long Range Transmitter Module for FrSky R9 Series (74 builds)
Banggood.com
$61.80

Battery Charger

ISDT Q6 Pro BattGo 300W 14A Battery Balance Charger (47 builds)
Getfpv.com
$59.99

Soldering Iron

TS100 Ltkolben KIT + TS-I inkl. XT60 Kabel (248 builds)
Flyingmachines.de
$73.51
Show stores (5)

Discussion

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Nabla   Apr 26, 2021  

So much drag. I suggest moving prop line to CoG

Show 3 more comments
Nabla   Jun 11, 2021 

Are you conflating how fixed wings, rockets, and quads fly? Fix wings need to have the CoG and CoP distanced to some degree relative to speed, yes. Rockets, do as well as far as I know but only because the thrust vector should intersect the CoG for stability (unless you are using fly by wire). But quads... quads are different because the combined thrust vector is constantly changing per the control loop and as a result doesn't even have a textbook center of pressure because of the 4 control sources (motors). I would just think that by adding the tail you are decreasing your thrust to weight ratio and increasing parasitic drag by adding more surface area. But again - I am merely a quad nerd behind a keyboard and this is merely a cool, and thought provoking project that I want to unfold.

nic4wtf   Jun 17, 2021 

Yeah, this vehicle is a bit different from pure quads, it relies on passive stabilization from the fins to gather the maximum motor performance.

Rockets can either use passive stabilizers (such as fins) to push the CoP aft or active ones (such as thrust vectoring you mentioned) to keep the stability by constantly correcting the errors as they appear.

Pure quads uses the motor differential thrust to keep everything stable. Because there are always very minor errors all the time, the quad almost never will go 100% thrust on all 4 motors, it needs to reduce some of them to keep the quad stable.

My idea with this vehicle was to relieve a little bit the 4 motors from the stabilization process. By having the fin there, they vehicle becomes passively stable, and therefore with some changes to the PID values and some other configuration, I can use more motor power for overcome the drag and go faster.

Let's think without the fins: if some control needs to be applied to the quad some of the motors would slow down to create the differential thrust - decreasing overall thrust.

Now with the fins: if the craft starts do deviate from the intended attitude the fins will take care of that passively. All the motors can, in theory, still be 100% and the vehicle will still be stable.

Yes they will increase drag but the gains from the extra motor thrust can overcome that.

Nabla   Jun 17, 2021 

Interesting concept - although I am still not convinced the fins are necessary because of the fundamental control mechanisms in quadcopters control firmware, but how are you managing the decrease in effectiveness of the tail fins in turbulent air from the props?

sl_rk   Apr 16, 2021  
1

sweet build. I want to see the DVR!

dafunk   Jan 29, 2021  
1

sick black n white pictures !!!

Alien79   Jan 28, 2021  
2

Ayyy nice design!! Are those custom arms?

nic4wtf   Jan 29, 2021 
1

Yes, they are incredible resistant to crashes =D

OptimaZe   Jan 28, 2021  
1

Very cool! Can't wait to see V2

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