17.62g 5" ARX Ultralight Concept Frame #4

By QuadStar Drones on Jun 23, 2019

20  560  31

The Goals

The goals:

  • To make an ultralight frame that isn't an eggshell
  • Take advantage of the strength of unidirectional carbon fiber (4.5mm x 1.5mm)
  • Use "off the shelf" carbon fiber so you can easily cut a new arm spar if you break it
  • AUW < 250g with an 850mah 4S battery

Staggered Motors

You may notice the motors are staggered due to the spar layout. I haven't noticed any issues with this.

The Camera Mount

It needs just a little more beef to it - or does it? There was some jello in the video, but it looks like a little more tuning might take care of it.

The Flight Time

I only flew it once so far and ended up with a 8:17 fly time (interrupted by a small crash/fall from a tree). Due to my inexperience with lightweights, I'm not so sure this is a good time(?) Also, I was taking it easy:

Photos

Discussion

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HK-AERIAL VTOL   Jul 14, 2019  

Oh hey man! See how the plate is on this build (no hooks for the bands and larger slots)? That is what I was saying about doing to the normal ARX-R plate.

HK-AERIAL VTOL   Jul 05, 2019  

OK... I think I have a valid question that I might as well ask in full public view so we can all get an education. How do you land a pusher? If it is "the same way you land your ARX-R"... do you tear the props up a lot on landings? I have seen that guy on YouTube hand-launch and land, but I can't do that... lol.
Also: Have you flown one of these ultra light ARX's with APC's?

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HK-AERIAL VTOL   Jul 05, 2019 

Hmmm. Yeah. I myself do not fly LOS outside of 2". That... would be a challenge for me. Do you land all of your frames like that? How does the speed canopy stand up to landing like that? I actually pull back and float 'em down. Sometimes I gotta circle for another attempt.... doesn't bother me.
Also: Just watched that printed pusher maiden vid on the 'tube. We wanna see the quad pics (and maybe fly it a few packs... lol. =])! I wanna be the first kid on my block to have a 3D printed ARX variant

cptandy   Jul 07, 2019 
1

Here is what I do. Option 1 when you come in for a landing start making very very tight Spirals and kill the quad about a foot off the ground. Just take some time again practice so that you don't kill the quad too high up. Option 2 would be land near a six to ten foot pole and use that to guide yourself in again kill the quad right before you land on the ground. Basically at 45Deg Cam angle you will just see the tip of a pole in the bottom of your view and that will let you know you are level then get your hight sorted out keeping the pole in view so you do not drift too much.

HK-AERIAL VTOL   Jul 07, 2019 

I usually do #1, but #2 really sounds like something I should try out. Thanks for the advice!

Dave_C FPV   Jun 24, 2019  
2

Pushing the limits again! Good work man, this is impressive.

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Dave_C FPV   Jun 25, 2019 
3

3D printed frames are so much fun to design! Super cheap, fast prototyping cycles plus more degrees of freedom.
Also they are easy to share with the community. Super curious what you will come up with!
Let me know if I can help you out I've learned quite a lot playing around with 3D printed frames in the last year!

QuadStar Drones   Jun 28, 2019 
2

Yes, I will let you know. My first project will be a toothpick class frame. I've been stuck in the 5" world for too long! However, I already printed a rough design of a 5" frame in PLA just to see how the material holds up and I was surprised how well it works

Dave_C FPV   Jun 28, 2019 
1

Sounds great! Micros work best for 3D printing. Also tempering the PLA makes a big difference

Jodie Froster   Jun 23, 2019  
2

I have been watching your development on this since your first post, and it has been a wild ride. I remember your first tube with panty hose egg sized nose cone, and z arms. It was so far from what I saw everywhere else, and yet so obvious. The different construction techniques you have implemented, gained skill in, and eventually moved on from, have been so interesting to watch. The current superlight approach is interesting, and this is a good time (in terms of available, off the shelf PCBs) to be doing it. I wonder if you will soon be able to get 16x16 stacks that can handle 2204 or 2205 motors. I'm suprised you don't have a canopy of some sort on this though, have you considered vacuforming polycarbonate?

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fovea   Jun 26, 2019 
1

very sad there wouldnt come evolutions with carbon from you :-( sad sell your beautifull frame doesnt support your pioneer work enough.
very nice there will come some prints. can we have look at the test print process :-) are there allready templates :-)

i have got a question about the arx design, are there some downsides mount the fc vertical?
i tought about a quaddesign where the battery is in the middle of the frame and on onside vertical mounted is the fc on the otherside is the esc. i like to try this on a nanoquad, or im not sure... im sure you mention about this option or know why not to mention about, if you could explain would be very nice.

fovea   Jun 26, 2019 
1

very sad there wouldnt come evolutions with carbon from you :-( sad sell your beautifull frame doesnt support your pioneer work enough.
very nice there will come some prints. can we have look at the test print process :-) are there allready templates :-)

i have got a question about the arx design, are there some downsides mount the fc vertical?
i tought about a quaddesign where the battery is in the middle of the frame and on onside vertical mounted is the fc on the otherside is the esc. i like to try this on a nanoquad, or im not sure... im sure you mention about this option or know why not to mention about, if you could explain would be very nice.

QuadStar Drones   Jun 26, 2019 
1

I actually built a prototype with a vertical battery that is centered and vertical flight controller. There were no problems at all, they can be put in any orientation

SkyLine FPV   Jun 24, 2019  
2

looks awsome!. the fact that you can fly around at ~5A is amazing. my 5" hovers at 8A lol. Your frame design is always so interesting, keep it up.

QuadStar Drones   Jun 26, 2019 

My current meter isn't calibrated right so it's more like 7A than 5

Pit   Jun 23, 2019  
2

I think there's actually a point from where the 5" is becoming too light. Especially if you fly on a windy day. Perhaps make it 4 inch to reduce its sail area, use some 2204 motors with a higher kv and it will likely be more enjoyable overall. 2204 for a 5inch is too weak in my opinion. It can't accelerate the props well enough.

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HK-AERIAL VTOL   Jun 23, 2019 
3

Oooooh. 2204.5 Hyperlites are killer. I just got a set and put them on an ARS 3D print job with a Mamba MK2 20MM. It is really gonna be hyper LITE! I'm mocking it up at: https://rotorbuilds.com/build/18617

Edit: lol. I just saw that I also just used the exact same stack you did for this on that ARS-5 (my first Mamba anything...)! Dont you think that they could have made it just a little easier to solder? They really pack a lot of wiring into such a little stack. Still... it is powerful, full featured, lite, and it is CHEAP.

Dave_C FPV   Jun 24, 2019 
1

I use Xnova 2204 2500kV on a light sub 200g build and they perform great with those very light T-Motor props which are my favourite fot that setup

fovea   Jun 26, 2019 
1

why is the weight overrated, because of physical limitations which go more worse with less weight? (regardless of windy air)
is it simply because we can choose very enough powerfull motors? because benefits arent usable softwaresupportside?

my toughts was the marketsupport, like lightweight 5" props... or probably the software are the limitations.

IcarusIX   Jun 23, 2019  
2

My guy strikes again, lol, that looks really efficient, light weight, low power motors and good aero arms, with a battery of that size, that's definitely a good flight time. how do you reckon it'll handle a crash or fly with a larger pack (wont be sub 250g but still)?

QuadStar Drones   Jun 23, 2019 
1

I had a fairly low impact crash in the video (stuck in tree, then fell) and it was fine but not a good test. With the battery on, I chucked it around the living room a bit and made sure it landed on the arms. The worst that happened was the motors sliding about 10mm on the arms which is by design (no hard mounting locators). I get tons of flak for the way I mount motors but I'd much rather loosen the motor screws to realign the motors than break something. I worry more about the vulnerable fc and camera than anything else.

IcarusIX   Jun 23, 2019 
1

with how easy those arms are to make, its fair logic. fair to say that it's fine for mild to medium tumbles but not hard hits(guess)?

WizzX   Jun 23, 2019  
2

what kind of cables goes to the motors? are those thinny cables enough ? or is there some special super thin insulation? BTW Superb build

QuadStar Drones   Jun 23, 2019 
1

Thanks! The wire is called magnet wire. It's the same type of wire used in motor windings. Since they are a single strand and insulated with epoxy, they are much thinner than multi-strand silicone insulated wire. I used 20awg and I would have used 22awg if I had some. If you do the math 22awg is plenty for this setup and 20awg is plenty for high power setups. If you do a google search or use generalized reference charts found online, they will throw you way off since they reference power transmission and/or chassis wiring. We are only dealing with 3-4 inches of wire.

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