2" Pizzabox Indoor Rocket

By ghostface on May 06, 2018

17  1,456  20

Intro

Wanted something with protected props for indoor and playground flying.
I basically had another duplicate 2" 1103 quad that I wasn't overly happy with and decided to use its internals and build the pizzabox quad after stumbling over the twentyfour7 frame by jimbo_wa.

I had already looked at the dj-105 and rs90 in the past but never got around to build a successfull version of either even tho I printed the frames ages ago.
My target was 50g but I ended up at 55g which I find acceptable. As I have another quad at roughly that weight running the same props+motors I knew it would be speedy enough (especially for indoor).

Printing the frame

I experimented with various materials in the past, including Nylon, CF-Nylon, ABS, PLA, CF-PETG.
This time I opted for something new: PC-ABS (Polycarbonate-ABS).
Printing it worked fine as long as you use an enclosure and a heated bed (HOT at 110°).
I was printing at 280°C on glass and had no issue with adhesion after using a thin coat of hairspray and an ambient enclosure temperature of about 34°.
Glass has the added benefit of a super shiny finish :)

I had to use only one perimeter in order to get the infill perfect tho - anything more and there would be gaps in the print.

Cam Mount

Alt Tag

The default frame called for 15mm standoffs and has a strange tilted plane to stick the cam on to - I wasn't very happy with that particulary as I was looking to use this quad indoors and outdoors requiring different angles for flying.

So I went ahead and designed a tiltable cam mount for the Turbowing cmos cams.
I shared that here: https://www.thingiverse.com/thing:2896804
I did end up using 20mm standoffs tho to allow for the tilting and the super_s f3 stack that I reused.

Challenges

During the build

If you want to run 2" props care must be taken with wiring and stack height. In my case the smaller fc on top of the stack is just fine to clear the gf 2" props.
On regular 20x20 stacks you will get issues.
Also make sure to get your wire management tight so the props don't cut anything loose.

I did have to extend the wires from the cam and vtx to wire everything up tho.

If you are wondering about the random use of m2 spacer under the motor screws, it is to make sure the longer m1.6 screws I was using aren't touching any of the windings.

The vtx03 on the other hand was no challenge at all as the frame has a recess designed to put the vtx in including a zip tie to secure the antenna (great job!).

After Maiden: Problems/Brownouts

After maiden the quad would fall out of the sky randomly with the escs rebooting - no mater how high the throttle.
I remembered researching this issue before as well as how the super_s stack only has a ~0.5a BEC.
After reducing the vtx output from 200mw to 25mw the brownouts were gone and everything worked as expected.
Based on my measurements I assume that up to 50mw should be fine :)

Maiden (pids not perfectly tuned)

Only did some quick adjustments on the pids as I had like 15 min. to test it.
Will also probably swap one motor that is dodgy (crashed the build I salvaged the motors from a bit in the past).

Tweaked PIDs indoor flying

Very happy with this after tweaking the pids some more

Conclusion

Overall I am pretty happy with this build. We will see how well it holds up in the future. I might replace the standoffs for aluminium ones (instead of the nylon ones) but I'll have to check what weight penalty that will be and how durable the nylon standoffs are first.

Updates

  • Added a quick video from the maiden
  • Swapped a motor that was a bit dodgy
  • Routed the antennas differently to make for a flat and compact build. XM antenna now runs inside the frame at a 90° angle and the vtx is vertically zip tied to the standoff.

Alt TagAlt Tag

Photos

Part List

Frame

TwentyFour-7 2" Quad by jimbo_wa
Thingiverse.com
See Site

Flight Controller

Super_S Flytower Omnibus F3 Flight Controller Built In Betaflight OSD Dshot 6A 4 In 1 ESC BLHeli_S (13 builds)
Banggood.com
$30.22

Motors

4 x Racerstar Racing Edition 1103 BR1103 8000KV 1-2S Brushless Motor Green For 50 80 100 RC Multirotor (5 builds)
Banggood.com
$35.96

Propellers

CA$4.37 20% 4 Pairs Gemfan Hulkie 2040 2.0X4.0 PC 3-blade Propeller CW CCW for 0806-1105 Motor RC FPV Racing Drone RC Parts  (26 builds)
Banggood.com
$3.19

FPV Camera

Turbowing TWC25 1/4 CMOS 700TVL 120 Degree NTSC Wide Angle Mini Camera for DIY Micro FPV Racer (3 builds)
Banggood.com
$11.32

FPV Transmitter

Eachine VTX03 Super Mini 5.8G 72CH 0/25mW/50mw/200mW Switchable FPV Transmitter (429 builds)
Banggood.com
$11.99

Receiver

FrSky Ultralight XM Receiver Up To 16CH for RC Drone FPV Racing (71 builds)
Banggood.com
$11.99

Batteries

Gaoneng GNB 7.4V 550mAh 2S 80/160C Lipo Battery JST Plug For Aurora 90 100 (13 builds)
Banggood.com
$9.99

Radio

FrSky ACCST Taranis Q X7 Transmitter 2.4G 16CH Mode 2 White Black International Version for RC Drone (165 builds)
Banggood.com
$154.04

Goggles

Skyzone SKY02S V+ 3D 5.8G 48CH FPV Goggles With Head Tracking HD Port DVR Playback for RC Drone (20 builds)
Banggood.com
$295.99

Misc Parts

5Pcs Realacc 58mm Battery Tie Down Strap for RC Micro FPV Racing Quadcopter Multirotor (6 builds)
Banggood.com
$1.99

Misc Parts

TwentyFour-7 2" Quad Turbowing camera mount by Ghostface
Thingiverse.com
See Site

Battery Charger

ToolkitRC M8 DC 300W 15A Battery Balance Charger Discharger for 2-8S Lipo Battery (7 builds)
Banggood.com
$39.99

Soldering Iron

MINI TS100 Digital OLED Programmable Interface DC5525 Soldering Iron Station Built-in STM32 Chip (75 builds)
Banggood.com
$53.99
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Discussion

Sign in to comment

blmk   Jun 05, 2018  

Hi, i wanted to ask , how did you manage to flash the newest firmware on to the Super_s F3 board . and what board did you choose from betaflight to flash the firmware.

Show 7 more comments
ghostface   Jun 05, 2018 

Hmm...
Do you have a lipo connected? I am not sure if the fc will supply 5v to the receiver if just connected via usb.
Does the LED on the receiver indicate that it is connected to the transmitter?
Is the configuration tab saving the sbus setting or reverting to something else?

blmk   Jun 05, 2018 

Yes I have a lipo connected.
It is connected to the tranmitter. ican see it on the transmitter as well as the led from the reciever.
It is saving all the options for the SBUS And the UART port is selected as serial RX on the 3rd port
i have no idea what is wrong this time.

my radio is an AT9 radiolink
and an SBUS at9 reciever

ghostface   Jun 05, 2018 

go into cli tab and do a dump all - send me the output via direct message please.

LUCIDUOUS   May 07, 2018  
1

did I miss a video link somewhere?

Show 5 more comments
LUCIDUOUS   May 09, 2018 

hepta. 7 motors. www.facebook.com/real3dfpv

LUCIDUOUS   May 09, 2018 

I also developed 3D FPV systems

ghostface   May 10, 2018 

ups, hepta it is then - fancy stuff man!

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