⏩Hyperlite QSD ARX-R 6"⏩
By HK-AERIAL VTOL on Jul 12, 2019
When I lost (read: wrecked in spectacular fashion at near top speed) my first 6" ARX-R I knew almost immediately that the rebuild would dwarf the original effort. I expected the T-Motor F60 Pro III's to outperform their predecessor, but in all actuality the Pro II is faster in a noticeable manner. The Pro III's were actually meant to be a smoother version, but regardless, I have built my last 4 quads with Hyperlites. The propensity for this monster to run anything else is obvious (zero). I love PyroDrone (the motors and the people). They produce the type of motor that I expect for my money, and have delivered their wall-stator equipped 2208.5 1722 KV's for this bad mother! The 2208.5's are a member of the NMB 9MM bearing Hyperlite family and so they have that familiar "big sound" that the 2408'5's emit. They should.... their huge. They have more power than even most pro-level rigs need, and they are NOT for the new pilot. They are heavy on amp draw, but will easily hit more than 2 minutes of ultra-manic flight that they advertise as the range. Odds are you will need to scale your throttle. I love the feel of the 2-blade 6043 and 6045 APC's, but the focus of this quad is to drive the massive 6" pitched 6060's. I'm trying to move air here! Like my 5", this one also takes advantage of the small yet powerful 20MM Aikon32 stack (I just went with the F4 Mini since I like it and it was almost half of what the F42020 would have cost me). 35A is actually plenty for this build as I use the same to rip the 2207.5 2722KV's on the 5260 APC's. As always... Venom Graphene delivers the power. What level of voltage? That depends on the RPM limits of the propeller (oh yeah... at this level of the hobby you actually need to pay attention to things like that). We are calling it 4 through 6S.
I decided to wait to post this until I had the maiden, and I have to say that every component on this list is a real performer. The feel of this build is for me a perfect example of what a super light, fast, and powerful race quad should be (...as always...I am running a bone stock BF 3.5.7 tune). It has endless "power to weight ratio" feel (... I'm not sure that measurement really means anything these days), and the handling is like nothing else. APC 6043's made the first flight fast and strong, but it was only a quick one, my camera angle was low, my battery is an older 4S (small voltage = low RPM. New Venoms OTW!), and I like to check the motors a couple times before I really light them up. So, world record holder? No reason it can't be. I'll try that sh!t when I get those 6060's from Rob! The 6" ARX is more for my enjoyment as the 5" is what I am banking on speedwise (Edit: super ill "speed focused 6" OTW... stay posted). The 2207.5's are the highest RPM Hyperlites, and so that 5" will try to hit a high note while this one guarantees me one to have fun with. So what am I saying? I think the 6" ARX-R is my preference for freestyle and the 5" makes a good bullet. You should get one of each for your squadron while you can.
Edit 7-17-19: I was battling some 3/4 to full throttle shakes for a while on this and my 5". I could see that it was TPA that needed adjusted, but no matter how low I set the breakpoint or how high the attenuation level was configured I couldn't get rid of these shakes. I've been waiting for my battery delivery, and the difference cannot be more dramatic. In both quads I have lost all high throttle shaking. Could it really be that the old and decrepit Ovonic I was using was causing a bunch of noise? It appears so. Once again I have proven to myself how important clean and available power can be.
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A big toothpick maybe... right? Before I built this one I was researching what a "toothpick" is and I did actually just get Dave_C's Calimero printed and delivered. That will be my first in a motor class that small... I think 1105 is the smallest I've gone yet, but because I can get Hyperlite 1103's (... and one of those 16MM SucceX stacks) I don't see a reason not to build one of those as well (this was my 5th straight quad with Hyperlites... 15th in the radio).
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I'm glad you are enjoying this frame :) The build looks great - soooo clean looking!
Thanks Ryan! I absolutely loved putting this one together. Robs big 60XX props running on Pyro's 2208's pull your 6" frame around the air so moothly that it is hard to be focused on just "going fast".
Hey... do you fly one like this? The 6" on 6060's is really more like an out-of-body experience rather than FPV.
Question: I mocked up the next one... and I was thinking "that looks like I could get a 7" APC on it"... and of course you know I can. You think I should 7" that sucker up? 2408.5 Hyperlite's (mmm.... they go down to 1322 KV)? Have you made a big motor\big prop ARX yet?
You'll be the first - I have mine printed, but still waiting on parts to finish it. Besides, I still have the XLR V2 to work on. As long as I fly it before summer ends, I'll be happy. I'm not sure if I ever said anything about it, but anything larger than 5 to 5.5" will be slower. But if the motors can spool up the 6-7" props quick enough, acceleration will be ballisitic on larger props. I had the calculations checked over by other engineers (including an aerodynamicist) and they agree. With an aerodynamic build, the APC 5260's will be the best prop for speed.
have you and those engineers looked at apc 4 to 4.5 inch props and how those fare with speed?
Yes. I'll try to explain, but everything is entirely dependent on the amount of drag we have: Small props might be able to run higher RPM than larger props, but the thrust to drag ratio suffers. In turn, this increases the blade alpha (angle of attack) and reduces efficiency, loss of speed, more prop slip, etc. This is why small props can't have as high of a pitch as a larger prop. Larger props don't have an issue with thrust to drag ratio but they can't turn the RPM. I should also correct myself here: with the low drag XLR V2, the optimal speed prop size is between 4.75-5.25". As the drag increases, this range will increase since we want to decrease our prop slip as much as possible. Same goes for pitch and is the reason why I have seen 5045 outperform 5260 props on "draggy" quads, and then see the opposite on low drag quads. This is only part of the story. As you can imagine, there are a ton of factors that are dependent on each other - it is a very delicate balancing act that can drive you insane but I'm already there :/
That's really interesting, why would even smaller speed props exist if they can't effectively churn out more speed with more rpms? planes or something? and yeah, agreed, higher pitch props cant seem to unload on draggy setups properly which is when low pitch props can quickly and more easily on freestyle rigs and such. I can hardly imagine the rabbithole you've jumped into but you're in there and you're doing awesome :)