Yeti 6LR long-range cruiser

By beeb on Feb 15, 2019

17  1,841  10

This build was my attempt at making a long-range cruiser that's not too heavy, so that I can potentially try to fly a 6s1p Li-ion custom pack without drawing too much current. I found the Yeti frame by FridayFPV which comes in at 96g which is super light for a 6" non-racing frame! It should be able to carry a GoPro Hero 7 (which I enabled by designing custom TPU parts), and carry any size or shape batteries which is why I wanted a bottom mount style.

Components

  • BrainFPV Radix as flight controller: it has a nice graphical OSD to display gyro noise and features a high-quality gyro chip
  • T-Motor F55A Pro ESC: according to some tests I saw, this ESC is low-noise and will provide waaayyyy enough headroom for current draw
  • MB Primo 2208 motors: smooth and quite cheap, these are really enjoyed by long-range enthusiasts
  • Runcam Racer (first version): camera with a very nice dynamic range, not going for realism here, the picture looks kinda weird but you see EVERYTHING
  • TBS Unify Pro MMCX: first time actually using a MMCX vTX, came in handy when assembling the quad because I could easily pop off the pigtail to remove the "canopy"
  • Crossfire Diversity Nano RX: the new receiver allows to use 2 antennas, thus cancelling nulls in the reception pattern and also can use a backup battery to run after the main battery is ejected
  • 35mm GPS board: I found the small 18x18mm boards tend to lose reception over time, and become quite useless after a few months. The bigger ones provide quick fixes and seem to work better
  • Vifly Finder 2: buzzer with its own battery so that it can still beep in case the main battery is ejected. And it's loud.

Alt Tag

Build

Here are some pics of the build, it's pretty tight but you can take advantage of the height to make a 4-layers stack.

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Alt Tag Fitted a capacitor as an afterthought because I'm gonna use 6s Alt Tag Printed some custom parts to angle the two antennas 90 degrees to each other Alt Tag waiting for motors to be delivered...
Alt Tag motors are here!

It's done! I won't lie it was not easy cramming everything into that stack, but I'm super happy with the result!

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Finished

And here are the not-so-glamour shots! I'm pretty happy with the weight, it would have been hard to make it much lighter without compromising on motor power or features.

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Maiden Flight

Hope you liked it!

Photos

Part List

Frame

Yeti 6LR, mid-long range cruiser
Fridayfpv.com
See Site

Flight Controller

BrainFPV RADIX Flight Controller (Custom Graphical OSD, Baro, Stackable) (117 builds)
Getfpv.com
$55.99

ESCs

T-Motor F55A Pro 55A 3-6s BLHeli32 4-in-1 ESC (19 builds)
Getfpv.com
$74.99

Motors

4 x MB Primo 2208 2150kv (10 builds)
Multicopterbuilders.com
$75.96

Propellers

EMAX Avan 6x3.8x2 Long Range Bi-Blade 6" Prop 4 Pack - Choose Your Color (14 builds)
Racedayquads.com
$3.99

FPV Camera

FPVracing.ch
Fpvracing.ch
$37.00

FPV Transmitter

TBS Unify Pro 5G8 HV SE (MMCX) (10 builds)
Team-blacksheep.com
$44.95

Antenna

VAS Ion V2 Antenna 5.8GHz (RHCP) (16 builds)
Team-blacksheep.com
$16.95

Receiver

TBS Crossfire Diversity Nano Rx - FPV LONG RANGE DRONE RECEIVER (93 builds)
Team-blacksheep.com
$49.95

Radio

FrSky 2.4G ACCST System Taranis Q X7 16 Channels Transmitter Remote Controller White Battery and Battery Trays Not Include (256 builds)
Amazon.com
$124.99

Goggles

Fat Shark Dominator HDO FPV Goggles (137 builds)
Getfpv.com
$449.99

HD Camera

GoPro Hero7 Black — Waterproof Action Camera with Touch Screen 4K Ultra HD Video 12MP Photos 720p Live Streaming Stabiliza (27 builds)
Amazon.com
$299.00

HD Camera

GoPro HERO Session Waterproof HD Action Camera (4 builds)
$135.00

Misc Parts

Mini uBlox M8N GPS GLONASS W/ (35x35mm) Mounting backplane and Compass V2 (4 builds)
Readytoflyquads.com
$17.00

Misc Parts

ViFly Finder 2 Buzzer - Lost Drone Finder/Locater/Alarm (168 builds)
Racedayquads.com
$14.99

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (179 builds)
Getfpv.com
$159.99

Radio Module

TBS Crossfire Transmitter
Fpvheadquarters.com
$208.95

Battery Charger

FPVracing.ch
Fpvracing.ch
$219.00

Backpack

Lowepro QuadGuard BP X2
Fpvracing.ch
$129.90
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Discussion

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lorenzo220580   Dec 15, 2019  

how to feed the vtx?
do you use lipo source or fc source ?
thanks a lot

beeb   Dec 16, 2019 
1

I use the 5V on the FC (coming from the ESC regulator) but it's not recommended. Apparently the traces on the Radix are not made to support that much current, but I never had an issue.

lorenzo220580   Oct 05, 2019  

nice build and good video.
can you post the 3dmount of gopro and gps(are they together?)?

thanks a lot man

Show 1 more comment
lorenzo220580   Oct 26, 2019 

hi,
thanks for our reply.
I need one with 20° and one with 30°.
thanks a lot my friend

beeb   Oct 26, 2019 

There you go! https://www.dropbox.com/s/6hl9tk41d2l2uai/GoproMountYeti.zip?dl=0 The gopro part only needs support for that bottom part that goes into the standoff, and it's the same part for both 20 and 30 degrees. The part that holds the GPS doesn't need support and is different depending on the angle. Print in the default orientation of the STL. Enjoy!

lorenzo220580   Oct 26, 2019 

very kindly man.
thanks a lot

grazie

Irish126   Jul 05, 2019  

Nice build. Do you think these antenna positions are best for long range? What distance are you getting? Happy flying.

beeb   Jul 07, 2019 

Hey there. No this placement is definitely not optimizing range but it's nice and compact. With the diversity RX I have full LQ at more than 4km. I never had a dip below 90%. Of course that depends on your TX power but for me it works like this.

Currently   Feb 24, 2019  

Epic video!

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