Birdbrain RC Kittilyt 8

By BirdbrainRC on Jun 20, 2018

9  649  4

So. The Kittiwake 6 was supposed to be a long range frame, but really it was too heavy (great freestyle build though). Decided to revisit it, change up the design to cut weight, and go up to 8" arms whilst I was at it. Frame weight is 134g - not bad at all for an 8" frame, and about 50g lighter than the Kittiwake 6!

Turns out clearances are way too small on 8" with top mounted packs, but spot on with 7" props. Of course, bottom mounting batteries is still an option with either size prop, but given the availability of 7" props I'd say they make more sense for most builds.

Build was mostly smooth, the 1.3GHz VTX was awkward though since it's just gigantic compared to the modern 5.8G VTXs that are the norm. Antenna placement for the Rx was also an issue, given the length of the relatively inflexible coax.

Setup was easy with the Matek, even though I had to mount the board at 90 degrees to clear the screws at the side. Remapped the motors, and whilst I was at it I made a custom deadcat mix. The EzUHF system, however, was a complete pain to get set up, and whilst I (naively) thought the latency wouldn't be too bad on PPM, turns out there is quite a noticable delay in action to reaction. I'll be swapping over to Frsky R9M once I can get hold of a module and some receivers, getting GPS coordinates to my Taranis will be nice too.

Flight performance seems good so far though, plenty of float and punch, and it's not heavy on the battery either. Shall be fun to get out in the wilds and really see how it is at range!

Photos

Part List

Frame

birdbrain-rc (2 builds)
Birdbrainrc.com
See Site

Flight Controller

Matek F405-CTR AIO Flight Controller (2 builds)
Hobbyrc.co.uk
See Site

ESCs

4 x Spedix ES30 HV 3-6s BLHeli_S ESC with DSHOT for 3-6s (2 builds)
Electricwingman.com
See Site

Motors

4 x Cobra CPL2207 Green 2750KV 2600KV 2400KV 2200KV 1500KV Brushless Motor For 220 280 FPV RC Drone FPV Racing (2 builds)
Banggood.com
$87.96

Propellers

HQProp 8x5 CCW Propeller Thin Electric - 2 Blade (2 pack)
Getfpv.com
$5.20

Propellers

HQProp 8x5 CW Propeller Thin Electric - 2 Blade (2 pack) (3 builds)
Getfpv.com
$3.64

Propellers

DAL T7056C Cyclone Pro Propellers - Crystal Clear (2 builds)
Hobbyrc.co.uk
See Site

FPV Camera

Foxeer Predator V1 Mini 1000TVL Camera With OSD (Black) (1.8mm) (106 builds)
Hobbyrc.co.uk
See Site

FPV Transmitter

Fatshark 1.3Ghz 1G3 4CH 250mw FPV Transmitter (EU Channels)
Hobbyking.com
$45.08

Antenna

ProFlex Vee antenna 1-1.3GHz
Shop.prodrone.pl
$32.00

Antenna

SINGULARITY 1280/58 |
Truerc.ca
$29.99

Receiver

ProFlex Dipole 435Mhz
Shop.prodrone.pl
$32.00

Receiver

EzUHF NanoRX Receiver - ImmersionRC Limited
Immersionrc.com
See Site

Batteries

ZIPPY Flightmax 2200mAh 4S1P 40C (2 builds)
Hobbyking.com
$22.47

Radio

Jumper T-Lite 16CH Hall Sensor Gimbals CC2500/JP4IN1 Multi-protocol RF System OpenTX Mode2 Transmitter Support Jumper 915 R900/C (23 builds)
Banggood.com
$69.99

Radio

FrSky Taranis Q X7S Radio w/ Upgraded M7 Hall Sensor Gimbals (Carbon Fiber) (25 builds)
Getfpv.com
$187.99

Radio

FrSky TARANIS X-Lite (Black) (64 builds)
Hobbyrc.co.uk
See Site

Goggles

ORQA FPV.One OLED FPV Goggles (12 builds)
Getfpv.com
$549.00

Goggles

FatShark Dominator HD 2 Hydro-Dipped Urban Cam Grey and White FPV Goggle
Hobbyking.com
See Site

HD Camera

Hawkeye Firefly 6S 4K WiFi Sport HD DV Camera - $75.31 |GearBest.com
Gearbest.com
$75.31

HD Camera

HawKeye Firefly Q6 4K 120 Degree Angle Action Camera - $59.14 |GearBest.com (2 builds)
Gearbest.com
$59.14

HD Camera

GoPro HERO6 Black - Waterproof Digital Action Camera for Travel with Touch Screen 4K HD Video 12MP Photos (5 builds)
Amazon.co.uk
See Site

HD Camera

GoPro HERO5 Session (302 builds)
Getfpv.com
$199.99

HD Camera

RunCam 5 Orange 12MP 4:3 145°FOV 56g Ultra-light 4K HD FPV Camera for RC Drone (18 builds)
Banggood.com
$102.49

HD Camera

GoPro Protective Lens (GoPro Official Accessory)
Amazon.co.uk
See Site

Misc Parts

HGLRC Tiny GPS and GLONASS Receiver Module For iNAV (4 builds)
Hobbyrc.co.uk
See Site

Video Receiver

Furious True-D V3.5 Diversity Receiver System Firmware 3.8A (FatShark Attitude Version)SKU: FPV-RX-TRUD3.8A (27 builds)
Furiousfpv.com
$68.00

Video Receiver

ImmersionRC RapidFIRE w/ Analog PLUS Goggle FPV Receiver Diversity Module (179 builds)
Banggood.com
$149.00

Radio Module

TBS CROSSFIRE NANO TX (9 builds)
Pyrodrone.com
$69.95

Radio Module

Frsky R9M Lite - Radio Transmitter Module (Black) (11 builds)
Getfpv.com
$47.99

Radio Module

FrSky R9M 2019 900MHz RC Transmitter Module w/ Super 8 Antenna (ACCST/ACCESS)Default Title (17 builds)
Racedayquads.com
$45.99

Backpack

MultiStar Premium Multirotor Travel Backpack
Hobbyking.com
$47.03

Backpack

TORVOL QUAD PITSTOP BACKPACK PRO (5 builds)
Risingsunfpv.com.au
$359.99

Accessories

TrueRC True-MOX 868MHz Antenna
Hobbyrc.co.uk
See Site
Show stores (15)

Discussion

Sign in to comment

Jodie Froster   Jun 20, 2018  

I have been thinking about switching to lower frequency radio gear for longer range, should I expect the gear to perform mostly the same (but with longer range)?

BirdbrainRC   Jun 21, 2018 
1

Whilst I'm not sure about Crossfire or R9M yet, I have found that EzUHF has quite a bit of latency, not too surprising since it's an old system that's basically end of life now. It's probably not an issue for fixed wing use, but personally I find it just annoying enough that I'm going to fork out for an R9M for this build instead, probably use the EzUHF in a wing instead.

Jodie Froster   Jun 22, 2018 

Oh wow, thanks!

Amethyst FPV   Aug 08, 2018 

I think you may have issues if you use 1.3vtx with the R9. Nice build.

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