Armattan Bobcat 4"

By phaley51 on Feb 23, 2021

3  97  1

Armattan Bobcat 4" build running INav with full size air unit. Tight build which resulted in the esc having to be mounted in reverse and flipping motor channel wires around. Not sure if I’m 100% satisfied with receiver location, placed it underneath to be able to get the r9 antenna mounted vertically. Haven’t tested yet but flew well on my previous frame, homemade 3s 18650 3000mah batteries will deliver ~20minutes of slow flying, might try to build a 3s 21700 (i do have 4 s 18650 and 21700 I may try as well) Still need to clean up some zip ties on antennas but it is ready for first flights when weather warms up in next day or two. Will potentially upgrade the motors to fpvcycle 2203 2800 kv motors in the future to see if that lower kv will increase flight times.

4-9-2021 Update
Decided to change motors to the fpv cycle 2203 2800Kv

Photos

Part List

Frame

Bobcat (6 builds)
Armattanquads.com
$39.00

Flight Controller

Kakute F7 Mini 20x20 Flight Controller (12 builds)
Getfpv.com
$33.00

ESCs

Spedix IS35 35A 2-5S 20x20 4in1 ESC (5 builds)
Racedayquads.com
$37.99

Motors

4 x FPVCycle 23mm Short Motor - THE Cinewhoop motor (36 builds)
Fpvcycle.com
$79.96

Motors

4 x 1505 3600KV Brushless Motors (21 builds)
Betafpv.com
$59.96

Propellers

GemFan Hurricane 4023 3-Blade (30 builds)
Airbladeuav.com
$2.99

Propellers

HQ Prop Duct 89MMX8 Octa-Blade 3.5" Cinewhoop Prop 4 Pack - Gray (2 builds)
Racedayquads.com
$2.79

FPV Transmitter

DJI Digital FPV Air Unit - Ultra Low Latency 720p 120FPS Digital HD
Racedayquads.com
$179.00

Receiver

FrSky R9MM OTA SBUS Long Range 900MHz Micro Receiver - For At RaceDayQuads (87 builds)
Racedayquads.com
$24.99

Radio

FrSky X-Lite Pro RC Transmitter (ACCESS & D16) (26 builds)
Racedayquads.com
$194.99

Goggles

(PRE-ORDER) DJI Digital FPV Goggles V2 - Ultra Low Latency 810p 144FPS Digital HD (294 builds)
Racedayquads.com
$428.99

HD Camera

RunCam 5 Orange 12MP 4:3 145°FOV 56g Ultra-light 4K HD FPV Camera for RC Drone (22 builds)
Banggood.com
$102.49

Misc Parts

Matek M8Q-5883 GPS Module w/ Compass (53 builds)
Racedayquads.com
$33.99

Radio Module

Frsky R9M Lite Pro ACCESS - 900MHz Radio Transmitter Module (5 builds)
Getfpv.com
$62.99

Battery Charger

HOTA D6 Pro 325W 15A 1-6S Dual Channel AC/DC Smart Charger w/ Wireless Cellphone Charging - Choose Your Color (56 builds)
Racedayquads.com
$124.99
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Discussion

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maereax   May 11, 2022  

Hey man this build is awesome but wild. How does having such big motors on a 4" LR work out? Do you get decent efficiency on them? I'm looking to do a full air unit bobcat build and yours is one of the only results that come up