Li'l Grim Reaper SR --- 4S, 3" Build - Naked Vista, super-low filters *flight video*

By MamaJOE on Jan 11, 2023

6  230  2

The story behind the build

This is the evolution of my Li'l Grim Reaper Build.
Long story short, watch how it flies:

After I crashed this little guy and had to take it appart anyway, I tought of make some improvements regarding the flight performance.
The major change is the frame, which is now doubled to make it super stiff and allows me to use only minimal filtering in Betaflight.
To compensate the surplus weight, I decided to strip the vistas heatsinks.

Choice of components

The components already existed and I just modified the construction of the stack and changed some small parts.
For the camera I upgraded to a Nebula Pro Nano, which seems to be the best choice due to it's low weight an the 120 fps.

Building

I had some headache about the durability of a naked vista, so I added two tiny headsinks on top of the upper board, which doesn't get so much airflow due to the canopy. Furthermore I let a big spacing between the two board. Till now it works without any problems, even on full-power.
To use the potential of the stiffened frame, I added a JST SH socket, providing a UART, to connect a data logger (JHEMCU F4-Openlager) for tuning flights.
I added a second JST SH connector for the RX, because I have a very weird issue in conjunction with this AIO board: as long as the RX is connected, I can't flash the board. Therefore it's a big advantage just to unplug the RX than desolder it.
The Micro USB connector of the AIO board ripped off short before, so I took the chance to place it tuning-friendly :)

Flight quality

This tiny guy flies really super responsive with a good powerlevel. It's really fun to throw it around and you have to push hard to get it into prop-wash.
The 550 mAh battery offers a better weight-to-power-ratio, while the 650 mAh battery offers great flight time.
But form your own opinion how this quad flies and watch this: short flight

Data

Weight with props: 104 g
AUW with 4S 550 mAh: 165 g
AUW with 4S 650 mAh: 181 g
Flight time (550 mAh): approx. 3:30 to 7:00
Flight time (650 mAh): approx. 4:00 to 8:00

Photos

Part List

Frame

Quadcopter multirotor stack adaptor 16x16 20x20 25x25 30.5x30.5
Armattanproductions.com
$3.00

Frame

GEP-SP SKIP 3inch Frame - GEPRC (2 builds)
Geprc.com
$19.99

Frame

HGLRC Petrel 120X 3 Inches Toothpick FPV Frame Kit (5 builds)
Hglrc.com
$17.99

Flight Controller

HGLRC Zeus25 AIO 3-6S F722 Flight Controller 25A BL32 4in1 ESC (2 builds)
Hglrc.com
$69.99

Motors

4 x iFlight Xing2 1404 3800KV Motor (12 builds)
Pyrodrone.com
$63.96

Propellers

HQProp Durable Prop T3X2.5X3 Grau T3X2.5X3GR-PC (4 Stk.) (2 builds)
Rctech.de
See Site

FPV Camera

Caddx Nebula Pro Nano Digital Camera (16 builds)
Caddxfpv.com
See Site

FPV Transmitter

Vista Unit Module (3 builds)
Caddxfpv.com
See Site

Antenna

FpvCycle Minimortal T Antenna (16 builds)
Team-blacksheep.com
$3.99

Antenna

TrueRC Singularity 5.8GHz U.FL Lite - LHCP - 72mm (4 builds)
Pyrodrone.com
$19.99

Receiver

TBS Crossfire Nano Rx - FPV LONG RANGE DRONE RECEIVER (1372 builds)
Team-blacksheep.com
$24.95

Batteries

TATTU R-LINE 550MAH 95C 4S1P LIPO BATTERY PACK WITH XT30 PLUG (2 builds)
Nextfpv.com.au
See Site

Batteries

Tattu R-Line 650mAh 4S 95C Lipo XT30 (3 builds)
Rotorvillage.ca
$22.99

Power Distribution

2 x Panasonic 25V 330μF LOW ESR Elektrolytkondensator Capacitor Filter FPV Drone
Ebay.com
See Site

Radio

RadioMaster TX16S Multi-Protocol RF Module OpenTX 2.4GHz RC Transmitter w/ V3 Hall Gimbals (86 builds)
Racedayquads.com
$199.99

Radio

21700 5000mAh Battery for TX16S
Radiomasterrc.com
See Site

Goggles

URUAV V2 3 in 1 Dust-proof Shading Sheet Protective Lens Cover for DJI Digital FPV Googles
Uruav.com
$7.55

Goggles

DJI Digital HD FPV Goggles (128 builds)
Getfpv.com
$529.00

Goggles

iFlight Crystal HD Patch 5.8GHz RP-SMA Antenna for DJI - LHCP - Choose Your Design (4 builds)
Racedayquads.com
$44.99

Goggles

2 x Double Quad RX Black Edition LHCP RP-SMA male speziell fr DJI HD FPV System (2 builds)
Antennenfreund.de
See Site

Goggles

CNHL 18650 DLG 4S1P 3200mAh 14.8V 3C Li-ion Long Range Pack XT60 Plug
Chinahobbyline.com
$22.99

Goggles

Replacement DJI FPV Goggles Sponge Foam Padding
Shop.iflight-rc.com
$11.99

Misc Parts

OpenLager (3 builds)
Store.myairbot.com
$19.99

Misc Parts

Micro Buzzer (2 builds)
Drone-fpv-racer.com
See Site

Radio Module

TBS Crossfire Micro TX V2 (43 builds)
Getfpv.com
See Site

Battery Charger

2 x Power Genius SAFE Parallel board XT30 and XT60 2S to 6S with Fuse Protection (3 builds)
Pyrodrone.com
$19.98

Battery Charger

3 x BAT-Safe LiPo Tresor sicheres Laden und Aufbewahren der Akkus
Amazon.de
See Site

Battery Charger

ISDT PC-4860 Lipo Ladegerät Parallel Ladestation Unterstützung 4 Packs von 1-8S XT60 RC LiPo Akku
Amazon.de
See Site

Battery Charger

HGLRC Thor Lipo Battery Balance Charger Board Pro 40A XT60 XT30 Plug 2-6S Integrated with Lipo Discharger for IMAX B6 ISDT Q6 Na
Hglrc.com
$29.99

Battery Charger

2 x Amacoam 2 Stück Lipo Batterie Sicherer Beutel Feuerfeste Explosionsschutz Lipo Battery Guard Tasche Sack Gebühren Schutz Tasch
Amazon.de
See Site

Soldering Iron

Tilswall Soldering Station, 65W Solder Station Welding Iron with Smart Temperature Control (392°F-896°F), Extra 5pcs Sol (2 builds)
Amazon.de
See Site

Soldering Iron

K2 Air - ISDT
Isdt.co
See Site

Backpack

Skyreat Hard Carrying Case for DJI FPV V2 Goggles
Getfpv.com
$19.99

Backpack

Tarion Pro PB-01 Professional Camera Backpack
Tarion.eu
$149.99

Accessories

ETHIX Heated Deluxe Lipo Bag V2
Team-blacksheep.com
$64.95

Accessories

Kesser® Campingstuhl faltbar klappbar tragbar Angel Stuhl Camping Stuhl Faltstuhl bis 120 kg Strandstuhl Angelstuhl Klapphocker
Amazon.de
See Site

Misc Supplies

Bier – Wikipedia
De.wikipedia.org
See Site
Show stores (23)

Discussion

Sign in to comment

ClimbMit   11 days ago  

Nice and clean! What did you use to hold the frames together? I was thinking of using JB Weld to double up on my Crux35.

MamaJOE   11 days ago 

Thanks for your comment! I just used longer screws and fixed the two frames at the motor mounts and the stack mount. Additional, I put some magic damping grease between the frames. It's so sticky that the frames are bond together and it helps to reduce vibration!

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