Octocopter VS X8 - Which is STRONGER?

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In multirotor drones, there are two ways to construct an 8-motor drone: an "octo" configuration, and an "X8" configuration. Which of these setups is the best for lifting a heavy payload? And which one freestyles better?
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Опубликовано:

7 июн 2024

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Комментарии : 158

@cumminapart77 2 года назад

Shouldn't the x8 config being lighter be part of the testing? It's simply an advantage that comes with the design.

@jonahwillis 2 года назад

Exactly what I was thinking

@TopDedCenter 2 года назад

Agreed. Since they pointed out the disadvantage of the stacked props, you would think they would allow it to maintain its weight advantage.

@athefpv4670 2 года назад

Exactly the thing I was missing and wanted to comment on

@Vousie 2 года назад

Exactly. It's due to the arms being able to be shorter. Though I've got to note, the standard octo did have longer arms than it really needed, which would've unnecessarily increased its weight. Though it wouldn't have let the X8 win the weight lift test (as Shawn pointed out in another comment), it would've really helped the flight performance. Also, this specific standard octo's tendency to just go straight up is a major problem... For that reason alone I wouldn't want to fly it at all without fixing that issue. Probably a vibration/setup issue.

@cumminapart77 2 года назад

@RotorRiot I'd like to see what kind of a difference might be made by using significantly higher pitch props on the bottom (pusher) motors, if any. In my mind it would make sense. May be interesting to see what kind of results you guys can come up with in some x8 vs x8 tug of war.

@AOpsyche 2 года назад

i love the dynamic of Drib suggesting risky tricks while Shawn nervously laughs. what a saint.

@johnfigueiredo9154 2 года назад

🤣 I almost feel bad being entertained by his anxiety lmao but it’s great

@MrPhilbautista 2 года назад

I thought it was unfair to weigh the X8 down. It already has the handicap of 4 props going through "dirty" air so matching the weights of the 2 drones was like taking away the advantage of the X8 but not giving its disadvantage to the octo. I think the octo would've still won but it might have been better matched.

@LetsFlyRC 2 года назад

Even if you add the 1lbs of weight of the ballast, the octo still lifted more.

@colinmetzger6755 2 года назад

It made sense for the lift tests, but they should have removed it for the freestyle.

@fishman241 2 года назад

Although I definitely would have guessed that the octo would lift more, it's good to see this kind of experiment being performed! Don't trust your intuition, it's frequently wrong, go out and test, while recording. It's good for you and good for the world.

@dazzdoodlzfpv1020 2 года назад

Always something new on here, sweet vid guys

@ragefpv3606 2 года назад

"Fly better!" lol Great comparison video! Still having fun with it! Keep it up guys!

@KieronMcK 2 года назад

Great episode as always guys 👌🏼

@juicetfpv1504 2 года назад

Great video guys!

@drone-solutionz8013 2 года назад

A lot of people commenting on the added weight to the x8 being unfair, but the benefit of an octo is the ability to throw larger props which they didn't do. In their test they effectively handy capped both drones by matching weights and prop sizes. In the context of the "matched" thrust test I can see why they did it. What they should have then tried is a test in "best" configuration. So the x8 gets its light weight benefit, but the Octo frame gets to use bigger props to maximise its thrust to weight ratio.

@jerryzhang158 2 года назад

the x8 was just a converted fpv drone, if they extended the arms to have the same length as the octo the x8 could get massive props, but because they were so close together in the vid the x8 wasn't optimal

@DanishStallion 2 года назад

i could feel shawn's anxiety for the first 10min haha, always breaking his creations! good show guys

@YoYoYo 2 года назад

Entertaining video. Thank you!

@zilvinastarvydas4247 2 года назад

this question was always on my mind, thanks, finally I've got an answer! 🙂

@Kylemestyle 2 года назад

Late idea but what happens if you put (mad steep/ aggresive) props on the bottom motors.

@jaynorthwoods 2 года назад

I love all your videos. Would have been cool to see a view of the octo flipping from ground point of view. So fun, keep up the good work. I had a DjI s1000 in 2014 and would never thought it could flip! Cheers

@WrongWayFPV 2 года назад

What a genius way to do a tug of war with the quads! Ask vanover about desoldering an X-Class while in mid flight lol .

@RCRitterFPV 2 года назад

worth it...

@mahfpv7549 2 года назад

Why do I have a feeling that drone tug of war will be the next big thing? Really smart to use pulley!

@cumminapart77 2 года назад

I think they should do another one with two x8 configurations and high pitch props on the bottom motors of one.

@lostartefpv 2 года назад

LMAO @ Let's Fly when he picked up the Octocopter after the crash... Oh man, I felt his pain

@licensetodrive9930 2 года назад

Great comparison video, if I were there I'd have suggested speed runs to see which is fastest, with and without the additional weight to the X8 to see what difference it made.

@dou8letap82 2 года назад

Awesome!

@BritishBeeMan 2 года назад

Why did you put the extra weight on the x8? From a scientific point of view that was the wrong thing to do. You can't compare two different designs by nullifying design features. A bonus if an x8 is it weighs less. Its a trade off between size convenience, thrust and weight. Could you redo this without stacking the odds against the x8? It still won't lift as much but it should outfly it.

@Tymopta 2 года назад

They stated that the battery was 500g. That's 1.1 pounds. Add that to the weight it lifted and it's still less than the octo. Moot point.

@nfnworldpeace1992 2 года назад

well they technically they tested 4 vs 8 propstreams and with the weight being equal my guess is that the props stacking is canceling out or at least greatly reducing the power those props can put out this is further shown in the X8 where its way earlier at max throttle since half the props put out almost no lift there. this is also seen in biplanes wikipedia qoute: In a biplane aircraft, two wings are placed one above the other. Each provides part of the lift, although they are not able to produce twice as much lift as a single wing of similar size and shape because the upper and the lower are working on nearly the same portion of the atmosphere and thus interfere with each other's behaviour. In a biplane configuration with no stagger from the upper wing to the lower wing, the lift coefficient is reduced by 10 to 15 percent compared to that of a monoplane using the same airfoil and aspect ratio[1]

@divingfalconfpv4602 2 года назад

for pulling im fine with the weight since they were testing if you are losing power doing motors on top of eachother.. but for freestyle and tug of war they should of removed the weight.. though it would of still lost tug of war

@LetsFlyRC 2 года назад

We removed the extra ballast weight for the tug of war

@divingfalconfpv4602 2 года назад

@@LetsFlyRC oh ok perfect

@byte7378 2 года назад

Lol, you can just see the worried expression on Shawn's face! Also, cool video idea, the rotor riot guys should make a quad with nitro engines instead of motors. Like the comment if you want them to to see it and do it.

@LetsFlyRC 2 года назад

Been wanting to. But, haven’t been given the budget for it, yet. ;)

@byte7378 2 года назад

@@LetsFlyRC It'll happen eventually, just make sure to get some low rpm engines so that the quad doesn't run away when you start it up. Also, used engines are ideal here because it's an experiment and you don't want to ruin a brand new $350 engine(especially considering what drew does when you make a crazy contraption).

@dooddrones6521 2 года назад

On an X8 config I would try experimenting with having a higher pitched prop and a slightly higher kv motor on the bottom. You're trying to take turbulent air that's already been accelerated and trying to hit it with something moving the same speed, resulting in much less thrust being made by the bottom motors. If you have them trying to push more at a faster rate then you can actually make thrust from that dirty air.

@RSmerlinRS 2 года назад

Id of thought an octo/X8 of that size would have better than XT90 connectors.. AMPS, bro.. AMPS!

@LetsFlyRC 2 года назад

Technically, they were xt60... lol - Either way, it didn't matter, it still showed accurate results in the test. Usually, an xt60 connector is fine, when you aren't trying to go full. throttle, and not move, lol

@billmcdonald4335 2 года назад

Chris Rosser said that kinda thing would happen. So much current it'll de-solder itself. What a hobby: self de-soldering power pigtails and a small risk of burning your house down every time you charge batteries. Love it!

@aidanfarley9566 2 года назад

For the x8 you should have used the x8 propeller config from the rotor riot x8. It's supposed to be optimized for the stacked motor configuration

@thewaxlab 2 года назад

We’ve seen a 30% reduction in efficiency on the four motors that are reversed. We’ve actually been able to calculate the curve and it seems to hold true on various size multi rotors.

@vincentstrelow7142 2 года назад

I need to send you guys my six inch octo to check out, a little different platform than these. Great video!

@dpxfpv 2 года назад

Shawn is evolving just like the Linus Tech Tips guy.

@kwhp1507 2 года назад

I found this interesting because I have 3 x8 drones from 3dr. I got them for basically nothing when they was selling everything off a few years ago. I bought a case of motors for something like $2 each

@solo8820 2 года назад

Nice to see PDEVX on Rotor Riot lately. After seeing him on community spotlight I was a fan.

@nathan1sixteen 2 года назад

If you want to make the X8 more efficient, you should put a steeper pitched prop on the bottom motor. With the air already being accelerated/dirty, a prop of the same pitch won't produce as much thrust on the bottom, but a greater pitched prop should increase performance

@divingfalconfpv4602 2 года назад

I was saying this before on discord.. air is already moving so you are losing alot of thrust. you need prop that wants to move the air a lot faster.

@RFi731 Год назад

@@divingfalconfpv4602 so.. how about putting an EDF at the bottom instead?

@divingfalconfpv4602 Год назад

@@RFi731 those look crazy. I want to try one of those. Maybe for hover craft lol

@divingfalconfpv4602 2 года назад

I got to say I like that sharkbyte doesnt get all that blur when you in area with a lot of stuff.. like ill be just feet from myself but guess just too much data and the whole sides just blur out

@creationlabsinc.189 2 года назад

Sounds like you have issues with your setup. I’ll take blurred images any day over that analog style breakup. Yuck…

@divingfalconfpv4602 2 года назад

@@creationlabsinc.189 I have 4 dji quads. 2 bnf.. only issue I could think of is heat maybe causing it from high mW. I could try 25mw and see if any better. I'm usually doing long range

@thatguyblue4811 2 года назад

Would have loved to see six motor versions.

@rmdcade1717 2 года назад

Reminds me of the days before quadcopter supremacy, when it seemed like there was a new configuration every week.

@heimwolf 2 года назад

Yeah, got still my spider-hexa. Built the frame around 2011.

@breakflight 2 года назад

I love this style of video. Do it again without the handicap of the extra LIPO for weight. Each style of 8 seems to have a benefit: more lift or less weight. But you cancelled out one of the benefits.

@RubyS.1 2 года назад

Where you able to use dshot on all 8 outputs? Or did you have to go multi

@LetsFlyRC 2 года назад

yes, it was set to dshot 300

@LetsFlyRC 2 года назад

the fc I was using had 8 motor outputs

@dividingbyzerofpv6748 2 года назад

Test how it responds to a motor failure. Seems a benefit to an X8 with a redundant motor could help you get home if 1 motor went down. Also an X8 and how much real thrust is gained versus a regular quad. Also taggering prop pitch so bottom props are not stalling out. Maybe next comparing something an octo with 8 motors and 5in props might need to compare total thrust ouput to something like a regular quad with say 4 8 inch props in same thrust range.

@Mxoderberg 2 года назад

Soo... XT150 connectors on the octo next time?😁

@ChrisParayno 2 года назад

Simple aerodynamics. Bigger unobstructed prop area means more thrust. With the x8 configuration, you get efficiency loss with the counter rotating blades.

@carloslemos6919 2 года назад

disk loading is the answer

@YoYoYo 2 года назад

We want more vids with PDEVX. Please.

@Gosuminer 2 года назад

I would be interested if a quad with, say, Xing 2806,5 and 7" props outpower an octo with 2207 5". I bet it does which would make 5" octos kind of a silly setup.

@Kylemestyle 2 года назад

cool video. but I was disappointed in the weight that was added to the 2nd quad. That's the point to make it lighter so you can haul more

@LetsFlyRC 2 года назад

In the test results, it didn’t matter. Add the 1.1lbs weight to the calculation and the. Octo still killed the x8. Also, we removed the ballast for the tug of war

@rubinhodrone9204 2 года назад

Boa tarde Passando pra prestigiar aquele super like 👏 👏 👏 👏

@dg9bfc 8 месяцев назад

Build an x8 with a bit longer arms and put the down motors more inwards and some landing legs below the upper motors (that are on the outer end of the arms) So you have only 4 arms (lower weight) but prop area like the octo... And no prop has dirty air

@masterx11a Год назад

It's not so much about the dirty air. It's more that the x8 has the same prop area as a quad where as the octo has double the prop / surface area of air to push against.

@pritchfpv6070 2 года назад

5:37 are they using a 915mhz antenna on a 2.4ghz x-lite....

@LetsFlyRC 2 года назад

That x-lite was modded to be essentially a Tango - it has crossfire internals

@pritchfpv6070 2 года назад

@@LetsFlyRC ohh nice one

@chriscottell6854 2 года назад

Ave u guys checked out Jetson 1 on youtube yet?

@surgefilmsbroome7239 2 года назад

I feel bad that I enjoyed the tug of war destruction, FUN!!!!

@DrBrunoDzogovic Год назад

Radial setup is 20% more efficient than coaxial. The latter is an addition to make a more portable solution, more powerful. A radial drone is bulkier and more powerful but less agile. If by any means, one can attach a gimbal on the lower side of an X8, I don't see the benefits then of a radial octocopter beyond the lift strength.

@RCRitterFPV 2 года назад

Think we need a kinda serious test on what it takes to desolder an xt90... that could be expensive failure point. 8s? 12s?

@patrickvalk 2 года назад

I guess at least 100A continues for a while. It's rated for 90A

@MrPhilbautista 2 года назад

What was surprising was how nimble the octocopter was. Power looping and matty flipping like it ain't no thang.

@EmDee316 Год назад

“Fly better” - Drib 😂😂😂

@DinGuSco 2 года назад

You should of tested without the extra weight added on the X8... you are handicapping it when the weight saving is a huge advantage of the design ^^

@MotoStoriesandmore 2 года назад

Is this new Info?!??! We did thi shit in 2009 when we were testing Freely Cinestar 8's (octo's) vs Hexacrafter X8's. I can't believe this even gets a view.

@F1carslover 2 года назад

Wow

@damonwaters2716 8 месяцев назад

the x8 would perform better if the bottom propellers had slightly more pitch because the air is already moving so to maintain angle of attack more pitch is necessary

@didierneeferc 2 года назад

put a bigger connector on there like a XT90 or a EC5

@kefa7461 2 года назад

I don’t understand why the battery was added to the X8 to make the weights the same, one of the advantages for doing a stacked motor setup like that is for less weight contrary to an octocopter because less frame, so one of its advantages from an octocopter is just removed for these tests, I don’t think it would’ve affected the weight lifting and the tug of war, but the handling test with how it felt “heavy” probably would have been judged differently

@SerJG 2 года назад

Adding extra weight to X8 does not make any sense. It already carries extra weight for this shape - that’s why it can’t lift additional weight as octocopter without extra load.

@cadenmoore8190 2 года назад

Would the X8 perform better if each prop pair were not contra-rotating? I say you try it

@rhythmkhattar2738 2 года назад

Send iiiiiiit

@patregan 2 года назад

Don't ask why we had to test this, but my 5" freestyle quad with 5.5" props can lift a gallon milk jug that is a little over half full. Six pounds. It was hovering at something like 80% throttle.

@creationlabsinc.189 2 года назад

A full full gallon is 8.6lbs. Why not the extra 2+ pounds… full throttle that mofo! 😂

@patregan 2 года назад

@@creationlabsinc.189 We had a 6 pound 3D print that we "had" to lift. We tried to lift the entire gallon with someone's old 450 flamewheel build. It had 9.5" props and 2212 motors, and was meant to be run on 3S. We tried all the way up to a 6S pack, and it couldn't lift the whole gallon. It couldn't lift the ~6 pounds, either. By the time I said, "Let's just see if my regular quad can do it!" we had already spilled the extra 2 pounds on the ground. It was not a good flight, but I had lift, and I could have kept flying. ;)

@Kabab 2 года назад

While this was a fun video, I would have liked to see a little more discussed about the two platforms that are very very different. For one thing, the two don't even have remotely similar prop sizes. There's also a pretty wide spread of performance with cinelifter X8 crafts too...

@CarbonGlassMan 2 года назад

Maybe a 7 inch Hex would be more powerful than the x8. 2 fewer props but all 6 would have clean air.

@MeadowlarkFPV 2 года назад

poor shawn

@richiebricker 2 года назад

You didnt try the X8 without the extra weight. No Mano e Mano

@thatguyblue4811 Год назад

None of this happened unless you list the motor and prop set up.

@eqbviewllc7111 2 года назад

pusher/puller concept is NOT as efficient, especially at a hover. . . it may have some controllability benefits, but better speed should the most obvious benefit in something this size.

@peterzingler6221 2 года назад

And after all that. Why not just 4 but right motors? Every prop more means a lost in efficiency

@heimwolf 2 года назад

That´s not true for "real" octos or hexas. Each motor has to lift less so it´s ampdraw is lower. Anyway it´s a lame video, we all did this already, back in 2011.

@RCRitterFPV 2 года назад

Ok.. you need to double the Octo, x16 Ohh its a dead cat x8. isn't the only real benefit of X8 is to have two drive systems so one motor can fail. PNW represent, good seeing PDEVX on RR.

@su_K3N 2 года назад

Is that a wood plate of some sort 9:30? I don't think that is a fair durability test. Carbon fiber > wood.

@LetsFlyRC 2 года назад

That is how we used to build them, lol. I fixed it for the tug of war and replaced it with carbon

@heimwolf 2 года назад

@@LetsFlyRC I remember even having wooden arms back in the days.

@makatron 2 года назад

X8 should lighter since that's the whole purpose of that form factor, if you add a camera to the octa it'd be dead weight

@chaosfpv 2 года назад

Bam first 😁

@attainableapex 2 года назад

ya... but try and use them how they really would be used. ie, without the extra weight on the x8. thats the whole point of the x8, its lighter and smaller.

@LetsFlyRC 2 года назад

we removed the ballast during the tug of war, and the x8 still lost

@jb753 2 года назад

Try it again without the extra weight

@jeremygalloway1348 Год назад

Why string the weights...try separate amounts lift out of ground hover hold for 10s then land and add weight. Too much pendulum effect w the weight configuration ur trying

@tomjedusor3837 2 года назад

it's logical. that the big one is wider that the small one ..

@slate613 2 года назад

That wasn't in the rules It wasn't NOT in the rules he has a point, maybe lmao

@nathanc777 2 года назад

The ballast doesn't make any sense. Imagine a car review where they added weight to all the cars until they weighed the same before comparing them. If one design has a weight advantage, and the goal is to see which can lift more, why would you decide to equalize that advantage then compare them?

@Jo3harker 2 года назад

the test was to see if stacking the motors or having them separate made a difference that's why they kept the weight the same. Think about it.

@LetsFlyRC 2 года назад

if you add the 1.1 lbs of weight to the "lifted weight" of the x8, the octo still lifted more - either way, it doesn't affect the end result.

@Jo3harker 2 года назад

@@LetsFlyRC Exactly!!

@pinewaves_ 2 года назад

The extra weight on the other drone is a disadvantage since it doesn't have the "wing span" of the octocopter

@nathan1sixteen 2 года назад

Adding extra ballast to the X8 is kinda unfair, as one of the advantages of an X8 is that it's lighter. So your weight lifting comparisons are off

@Jo3harker 2 года назад

the test was to see if stacking the motors or having them separate made a difference that's why they kept the weight the same.

@nathan1sixteen 2 года назад

@@Jo3harker except that it didn't show that. You changed more than 1 variable, so the test is null and void. You can't handicap 1 of the quads and expect to get valid test results

@Jo3harker 2 года назад

@@nathan1sixteen Either way you're dumb if you think stacking motors on top of each other creates more thrust than if you had them sperate. All ima say

@LetsFlyRC 2 года назад

Even if you add the 1lbs of weight of the ballast, the octo still lifted more.

@runforestrunfpv4354 2 года назад

Anyone built a X16 yet

@LetsFlyRC 2 года назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-savq2AVPcPY.html

@divingfalconfpv4602 2 года назад

for the freestyle and tug of war should of removed the extra weight.. the 1lbs weight saving and smaller size would be the reason to go with x8 over octo

@LetsFlyRC 2 года назад

We removed the extra ballast weight for the tug of war. Still... The octo-copter won. And with no problem. lol

@divingfalconfpv4602 2 года назад

@@LetsFlyRC yea even without the ballast it still 2lbs advantage or real close to it lol 😆

@willbrown8928 2 года назад

Needs bigger motors...

@genericfpv2464 2 года назад

Why 4s though.... And xt60's...

@LetsFlyRC 2 года назад

4s is what the motors can handle on 7” props, and xt60 doesn’t usually cause a problem. Only when you are trying to make a quad full throttle while stationary. 😂

@genericfpv2464 2 года назад

@@LetsFlyRC well yes but why wouldn't you use lower kv motors on 6s with an xt90 at least, a 5 inch kwad can push an xt60 to it's limit sometimes and I melted one myself on my own 5 inch. Using on on an octo with that prop size is just impractical and begging for disaster.

@gyuziyo 2 года назад

focus..plz..

@SkyrisUK 2 года назад

100% obvious result , X8s lower motors run in dirty air and lose around 30-40% thrust as a result , a way around that is to run Higher pitch or Longer Props on the lower motors, even then 8X is still inefficient compared to a Octo, on average an X8 would be about the same as a Hexa config in terms of power .

@carloslemos6919 2 года назад

There is no way (completely) around it, google "disk loading"

@helidrones 2 года назад

The lower props on an X8 need a steeper pitch to work efficiently. So this comparison is pointless.

@1222sita 2 года назад

@aaronmullins7200 2 года назад

6th

@dannyb_fpv2807 2 года назад

Very inaccurate to make the other drone heavier..

@jtyokomo 2 года назад

Isn't one of the advantages of running an X8 configuration opposed to an octo because its lighter weight? I think making them the same weight defeats the purpose as to why someone would chose X8 over octo

@jarredgallaher2643 2 года назад

Sean used to be cool on the channel. dont fly it if you dont want to break it. - LetsWhineRC All the cuts made it look like a nurk video

@LetsFlyRC 2 года назад

I am cool if they break it. Just not in the first 10 seconds, 😂

@jarredgallaher2643 2 года назад

@@LetsFlyRC I get it, but once you hand of the tx, its 100% gonna be thrashed. not any need to worry with 100% odds The editing of the video was pretty bad too, but I know that's not on you