Last Round In The Magazine

By HK-AERIAL VTOL on Nov 09, 2019

24  443  6

It's fair to say I'm stepping out on a limb, but I am on the edge and that's where it happens.
-Max Cohen, Pi

This build certainly took longer than I intended. It didn't help that I moved on and completed some other very sweet rigs. I really tried to work out a very bomb-shaped canopy and tail combo that was sent to me by the Ryan @ QuadStarDrones, but my designer is a little tied up right now, and I left it as a possibility... so no biggie. This is the 6" ARX-R, but to drive the big 7" APC 7045's & V1S (or maybe some 6045, or 5260's... I'm gonna try 'em all) I made what might be considered an odd match. The Hyperlite 2207.5's are the highest RPM motor in their series, but I felt since the plan was to move more air, that a little higher torque might help. The 2208.5's are not much different than the '07.5's, but I also elected to take their highest KV option. I can turn the system down if need be, but big props and high RPM is the name of this bird's game. This is my last good shot at approaching Ryan's record (this year anyway), and so I figure I would get some nice electronics. A premium 6S Heli-Nation Talon GigaFusion Dual Gyro F7 Combo pumps the life under this hood with my second BF4 flash ever (required for the dual F7 setup). Stay tuned for my opinion. One really important thing to manage in an ARX-R build are the motor wires. They can really only be arranged in one fashion, but how to secure and protect? I got the idea that I could take one of those old thesis binder clips and cut it in sections and "clip" them onto the CF. That.... turned out nicer than any other hair-brained scheme I've come up with and I think I am gonna even start trying it out on "regular" style rigs. Ryan shot me the new corner braces he made to stiffen the ARX right before he shut down. They make the ARX feel like a solid-plate CF frame rigid.

I gotta give some props Ryan, through which all things ARX are made possible, CloudCraft (really?) for doing good work on the nylon canopy print + polish, and of course DWreck @ PyroDrone for shipping me these red V1S for my BLUE hex (lol... it all comes together; doesn't it?). This is the end of my season and so I just wanted to send out mad love to all of you toolshed and basement builders, freestyle-farm pilots who do cow prox work and rip barndos (lookin at you Reckless_FPV), and mountain + building divers. Your videos, pics, and build sheets keep me inspired to push the boundaries, build champion caliber rigs, and fly right.

Edit 01/13/20: I finally got to fly this rig after a 7 month build. So... YES, it's FAST. It is definitely faster than my 5" with 2207's on 5260 APC's (that configuration holds the record from what I understand). The 2208.5 Hyperlites can really care less how much prop they have to push and when that much torque has a 7 inch fan on it the results are GREAT! While I have now built 5 ARX-R's... this one is certainly the hardest to land. It just goes so fast, and having a nearly 90 degree camera angle is for pilots that are good at landing (still not easy). I am betting that is the (speed) range I want to be in if I ever hope I surpass Ryan's record. The nearly stock tune (no modes... as usual) is sharp as has been my experience with the 4.1.2 release on my big hex and Ti LR (those sliders!) Now that I got it flying beautiful I am gonna shoe up those APC 7045's and see just how fast I can go!

Part List

Frame

ARX-R V2 6″ True X (2 builds)
Quadstardrones.com
$37.49

Flight Controller

Heli Nation Talon GigaFusion Combo
Airbladeuav.com
$95.00

Motors

4 x Hyperlite 2208.5-2522KV TEAM EDITION
Pyrodrone.com
$91.96

Propellers

B7x5E-B4 | APC Propellers
Apcprop.com
$6.22

Propellers

7x5E-B4 | APC Propellers
Apcprop.com
$6.22

FPV Camera

Foxeer Falkor Micro 1200TVL 1.8mm FPV Camera (60 builds)
Getfpv.com
$36.99

FPV Transmitter

AKK FX3 VTX (109 builds)
Akktek.com
$18.99

Antenna

AKK MMCX Linear Antenna (15 builds)
Akktek.com
$7.99

Receiver

FrSky R-XSR 2.4GHz 16CH ACCST Micro Receiver w/ S-Bus & CPPM (811 builds)
Getfpv.com
$20.99

Batteries

TATTU R-Line 1050mAh 6s 95C Lipo Battery (35 builds)
Getfpv.com
$35.99

Misc Parts

Smallest Mini Dual GLONASS+GPS BN-180 Micro Double GPS Antenna Module UART TTL For CC3D F3 RC Drone Airplane (27 builds)
Banggood.com
$11.32
Show stores (7)

Discussion

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elmtree   Nov 20, 2019  
1

How did you fit 7" props on the 6" arx r? is it just big enough or did you get custom arms?

HK-AERIAL VTOL   Nov 20, 2019 
1

Actually... I believe this is the result of combining 2-6" hybrid frames (2 sets of the back arms)! I ordered a hybrid a while back and Ryan sent me 2 sets of arms... and then I ordered some more parts and he sent me a couple more! Since it was my fourth (and final unfortuantely) V2 I decided I really needed a 5, 6, and 7" on the shelf. This is my first BF4 rig (required due to dual gyros), and it flies AMAZING on the default tune. My video is a little sketchy... but I got all winter to iron out that little wrinkle. I PRAY Ryan releases a 3rd installment as I have been spoiled during this (my sophmore) summer between him and Mr. Shen.

elmtree   Nov 20, 2019 
1

Is hybrid frame the stretch x version? it looks great!

HK-AERIAL VTOL   Nov 20, 2019 

Longer motor 1 and 3 arm (in the back). I... didn't really remember what went to what (I had a pile of parts from a previous wreck and new orders), and so I took my 8 longest spars and went with them. It is still an (unstretched) "X".

Thanks for the love... I really appreciate that. :)

jdmkramer   Nov 10, 2019  
1

Gorgeous! Especially that pod :)

HK-AERIAL VTOL   Nov 10, 2019 

Thanks! I gotta say that I am a little skittish at getting contract work done in PLA or ABS, but I always get really great results in the nylon. TPU is really expensive, so I decided to go this route. I am super happy.

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