6S CherryCraft Stamina

By LeoFPV on Jul 03, 2018

7  595  1

It's been a while since I did my previous Stamina build, which took a look at my 4S setup a few months ago. Since then I have been testing various firmwares and components in order to build a phenominal (I think so anyway) 6S racing setup for this year.
While alot remains the same from my 4S build such as the FPV system, stack and Rx, the motors have changed, as well as firmware and some build techniques. I want to briefly go through some of these changes. as well as show you how I put together a 6S racer.

Since the prototype stamina frames that I origionally started flying, the frame has been slighly changed and adjusted for strength purposes. An area infront the AXII mount has been recessed as well as some holes removed from the bottom plates to make them extremely crash resistant. I am also now using the 5mm arm option for
the Stamina. I think its a good compromise between max strength and keeping the weight of the quad as low as possible. I have only broken one 5mm arm after flying into a metal pole at full speed (I was not suprised I broke the arm, I expected the rest of the quad to be broken). Since the earliest prototypes I requested a 3D printable front camera piece to add protection to the FPV cam instead of using the stock carbon plates. The TPU front piece is much more customisable with colours and camera angle presets.

My next choice whilst moving onto my 6S builds was motors. I hunted around looking at many options such as the F40 Pro II 1600kv from TMotor, or the BrotherHobby R3 2207 1660kv. However I decided that I wanted to increase my Kv for maximum power on the race track, I opted to try the Hobbywing 2207 1750kv Race Pro motors.Alt Tag
Which to be honest have been amazing, fantastic quality and performance. Once TMotor had finished prototyping their new F60 pro II 1750kv they were kind enough to send me some of these as well, so at the moment I am using a mix of the HobbyWing and TMotors, with little to no difference in flight characteristics (I am using the same tune and filters for both motors).

Alt Tag
The rest of the quad stays pretty much the same as before. With the FlightOne Bolt V2 and RevoltOSD being my 6S stack of choice, with an extremely easy setup and
reliable hardware I have had no issues with FlightOne on my builds and will continue to use them with more and more 6S setups in the future. I have kept the Unify Pro HV Race, Nano Crossfire SE and AXII. However one area I do want to explore is FPV cameras, at the moment I am using the Runcam Micro Swift 2 with a 2.1 lens, however I would really like to try out some other alternatives such as the Runcam Sparrow 2 or the Pro, however one issue with this is the difference in FOV, a 2.1 lens in the Sparrow offers a much narrower FOV than the 2.1 on the micro swift. FOV is incredibly important to me and any change is extremely noticeable for me.

The Build

This build in particular is incredibly easy, which makes field repairs effortless and really quick, which can be vital during a race. I want to run over some of the main points that I have used in my build, which you can either use or change to suit your components.

The first thing is to install the stack onto the mid plate after the frame has been assembled, in my builds I use a M3x20mm blue aluminum screw as well as nylon nuts to Alt Tag
space the FC and ESC boards. I space the Bolt ESC from the midplate with one nylon nut, slide the ESC onto the screws with the FlightOne gummies already installed, on top of the ESC, another nylon nut, then the FC, then another nylon nut on top to secure the whole stack into place.

Then I like to foam tape the TBS Crossfire Nano Rx to the top of the FC and have the Immortal T antenna run out the back of the frame, this then allows me to secure it to an arm which gives me plenty of connectivity between the Crossfire Tx for racing, even on 10mw output.

With the RevoltOSD, FlightOne supply a cable set which works for a range of VTX's and cameras, however the harness is prewired for the TBS Unify, I don't shorten the Alt Tag VTX cable, I twist it to length and route it out towards the rear of the quad ready for the VTX installation once the top plate is on. However I do prefer to direct solder my cameras, this involves removing the pin connector and directly soldering to the cameras PCB, you can choose to do this or to leave the camera if you want to, however due to the camera angle I run, it meant that some connectors were close to each other and could potentially pinch wires if they moved. Direct soldering also saves alot of excess cable from inside the body of the frame.

Finally I install the Unify Pro Race HV video transmitter from Team BlackSheep onto the top plate, with the UFL AXII running out the back as well as the cables, I also isolate the antenna coax from the Unify's main PCB, in the photo you can see I heatshrinked it in two halves in order to do this, you can also run one piece of heat shrink if you choose to, and have a thinner piece of heatshrink straight on the coax cable. Then using the AXII 3D printed piece I just push the antenna into position and its sits perfectly out the back of the quad.
Alt Tag

After that I liked to route the XT60 wire out the back of the quad, however I secure it to an arm of the frame and have it sit on the side of the quad ready to plug in the lipo, this is mainly to provide strength to the wires when batteries eject and I reduce the chances of the wires being pulled off the 4in1 ESC pads.
I hope you enjoyed this breif build write up of my CherryCraft Stamina 6S setup, I really am impressed by the changes that 6S makes for racing, and I hope I never have to run 4s for races ever again! If you are unsure whehter to make the change from 4 to 6S, I would do it!

Interested in picking up a Stamina frame for yourself?
https://www.cherrycraft.at/frames/ - Direct from CherryCraft themselves
https://airjacker.com/products/cherrycraft-stamina-pure-racing-frame - UK retailer

3D Printed parts that I used!
Turtlemode fin (Updated and better design) - https://www.thingiverse.com/thing:2927964
Stamina AXII mount - https://www.thingiverse.com/thing:2902330
GoPro Session camera mount - https://www.thingiverse.com/thing:3011211
Camera mounts (I use the variable, I would recommend the 55 degree) - https://www.thingiverse.com/thing:2884180
Wire protectors from Add1ct3dd - https://www.thingiverse.com/thing:2563144

Photos

Part List

Frame

CherryCraft Stamina Pure Racing Frame
Airjacker.com
$43.99

Flight Controller

FlightOne RevoltOSD (9 builds)
Shop.flightone.com
$44.99

ESCs

FlightOne Bolt V2 4in1 ESC (7 builds)
Shop.flightone.com
$59.99

Motors

4 x T-Motor F60 Pro II 1750kv Witch Red (2 builds)
Quadcopters.co.uk
See Site

Propellers

HQPROP 5x5x3 V1S Durable Polycarbonate PC Props Light Blue (4 builds)
Quadcopters.co.uk
See Site

FPV Camera

Runcam Micro Swift 2 Black with built In OSD
Quadcopters.co.uk
See Site

FPV Transmitter

TBS Unify Pro HV Race 5.8ghz (2 builds)
Quadcopters.co.uk
See Site

Antenna

Lumenier AXII U.FL Antenna RHCP
Quadcopters.co.uk
See Site

Receiver

TBS Crossfire Nano SE
Quadcopters.co.uk
See Site
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Discussion

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Lee E   26 days ago  

Looks good Leo. Nice write up too. Just ordered one to try myself.

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