armytan glecko 4

By daich on Jan 25, 2019

6  609  1

Always love Armattan's designs
When they announced the Gecko I was intrigued
When they put it on sale during the holiday season I couldn't help myself

I threw some numbers into a spreadsheet and the step up in surface area from 3 to 4 inch is the biggest! I'm sure flight characteristics take into account a lot more than just prop area so it's doubtful it's a direct translation but I'm sure it has significant factor to it.

Prop Diameter Square Inch increase in area
2 3.1
2.3 4.2 24%
2.5 4.9 15%
3 7.1 31%
4 12.6 44%
5 19.6 36%
5.1 20.4 4%
6 28.3 28%
7 38.5 27%

Four inch quads never made it mainstream. People have previously used lightweight 2204-2205 or 1806 motors that were quite heavy. With the ever increasingly powerful motors coming out, I think it's time for a revisit of the 4" with some higher performance light weight motors!
The lack of prop selection in the four inch world doesn't help either.

This will be my first foray into 4" and I've got some more in the pipeline :P

I stole the motors and FC from the b-roll clone. It was over powered and had stand-offs in the frame anyway. The b-roll was around 160g and flew really great given then absolute monstor motors. This thing is 10g more with 44% more prop area!

--update 11th Feb 2019
finally got to maiden this. I tried it with a 450mah 4s 75c Tattu battery that weighs 55g - surprisingly flew decent. 4" is so efficient that it cruised for over 3 minutes! It couldn't handle the punches though...instant battery warning!
Sorry, raw DVR, turn volume down!

--update 11th May 2019
printed a gopro session mount for this that works pretty well, just looks nasty because my printer is wacky

and more random raw footage from a previous sesssion

Also Gemfan quietly released a new 4" prop in their freestyle Windancer line. It looks promising with a 32 pitch. I really like their 3" 3028 Windancer so hoping this one won't disappoint either.


Part List


Gecko 4 (5 builds)

Flight Controller

F411 Mini Micro F4 Betaflight OSD to Adjust PID BEC Flight Controller Tower with 4in1 28A / 35A ESC 2-4S DSHOT VS Flytower Drone


FullSpeed FSD435 Flytower F411 Flight Controller Built-in Betaflight OSD & 35A BLHeli_S 2-4S ESC (2 builds)


4 x GEPRC GEP-GR1408 3750kv Motor (3 builds)


HQ 4x4.3x3 V1S (2CW+2CCW) PC **Choose Color** (48 builds)


2 Pairs Gemfan WinDancer 4032 4x3.2x3 3-blade 4 Inch Propeller PC CW CCW for RC Drone FPV Racing
See Site

FPV Camera

Runcam Micro Eagle (301 builds)

FPV Transmitter

TBS UNIFY PRO32 NANO 5G8 (205 builds)


Lumenier AXII U.FL 5.8GHz Antenna (RHCP) (148 builds)


Frsky XSR-E XSR-M D16 OPENTX 2.4G 16CH Dual Telemetry Mini Receiver SBUS CPPM Output (20 builds)


Tattu 850mAh 14.8V 75C 4S1P Lipo Battery Pack (XT30) (34 builds)


Jumper T12 PLUS Open Source 16ch Radio with JP4-in-1 Multi-protocol RF Module With HALL Gimbal for RC Drone Car Boat (4 builds)


FatShark Dominator V2 Headset System Goggles Video Glasses 600 X 480 VGA
See Site

HD Camera

GoPro Hero5 Black — Waterproof Digital Action Camera for Travel with Touch Screen 4K HD Video 12MP Photos (4 builds)

Misc Parts

Gecko strapless skinny Session Mount by pathfinderzero
See Site

Video Receiver

GTeng T909 5.8G FPV Artifact 32CH Receiver 2 inch LCD Wearable Watch for RC UAV Quadcopter Drone Aircraft -

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (144 builds)

Radio Module

TBS Crossfire Micro TX V2 (106 builds)

Battery Charger

iSDT SC-620 Smart Charger (500W)
See Site

Soldering Iron

MINI TS100 Digital OLED Programmable Interface DC5525 Soldering Iron Station Built-in STM32 Chip (160 builds)


Upgraded MINI ES121 Electric Screwdriver Smart Repairtools Built-in STM32 Chip OLED with Screwbits (2 builds)


Turnigy Transmitter Bag / Carrying Case


SpeedyBee Bluetooth USB Adapter

Misc Supplies

FPV antennas for drones - Actuna TBS ImmersionRC - Actuna Sp. z o.o.

Misc Supplies

TrueRC X-AIR 5.8GHz Crosshair Antenna (RHCP) (4 builds)

Misc Supplies

Foxeer Lollipop 2 Stubby 5.8G Omni Antenna(2pcs)

Misc Supplies

ISDT BattGo BG-8S Smart Battery Checker Balancer Receiver Signal Tester Quick Charge Function (4 builds)
See Site
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fovea   Jan 28, 2019  


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