Pushing 8 blade props to 65,000 RPM
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- čas přidán 29. 08. 2024
- We set out on this adventure just to have some fun with a really unique drone running 8 blade propellors, but we ended up having way too much fun trying out the different kinds and learning about what sorts of sounds each make and the volume at which they make them! Check out all of the links to the parts used and if you choose to purchase, you support the channel:
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In World War II it was the sound of the German Stuka that struck fear into the hearts of soldiers. In World War III, it will be the sound of 5-inch bi-blades at 65,000 RPM.
i have 6-inch bi-blades, but only can fly them far away from civilisation. it eaven scares the crap out of me. hehehe
Not far off now eh
You didn’t know how correct you were when you wrote this.
@@Flumphinatoryeah 😢
This aged like fine wine
Question: What's the best 5" prop?
Answer: 3" 8-blade.
Rofl
There are now HQ props, 8 bladed 3.5inch, and 6 bladed 4 inch that should work better in a 5ª quad than the extreme 3" props.
i guess Im asking randomly but does someone know a trick to log back into an instagram account??
I was dumb forgot my password. I love any assistance you can offer me.
@Holden Milo Instablaster =)
@Ahmir Samson thanks so much for your reply. I got to the site on google and im in the hacking process now.
Seems to take quite some time so I will reply here later when my account password hopefully is recovered.
Would be cool to see a 5” 8 bladed prop fly in this set up.
imma hold out for 16 blade.
I’m waiting for the 69
420
Do dual motor mounts with 8 blade.. there u go, 16 per arm
Low turbulence
Half blades.
Nurk: shows us that 8 bladed props exists
Me: Buys 5 sets before even seeing the comparison
Same 4 sets haha
now they are backordered!!! damn.. Im late to the party
@@timm1065 try RDQ?
found them on Pyrodrone; luckily. now I'm just trying to decide on a frame and set of motors to get that free shipping... lol
HQprops recently released 8 blade 3.5inch and 6 blade 4 inch that should be a better match for a 5" quad, I think (and also look gorgeous)
I'm loving how happy and excited NURK is at the beginning. Seriously, how many awesome drones has he flown and this still happens for him.
7:35 LTT Was here
Rofl
More like LDT 🤣
👍👍 This is the sound that was etched into my brain several years back of how a 5 inch drone should sound snap flipped and rolled. 8:52
I often have anxiety about the noise of my drones this might be worth trying for me.
Can I ask why??
Are you scared of your own flying ? Or just not like the sound?
@@sulawesi-steve No not I'm not scared of flying when I am in the middle of nowhere I am fine. I have major social anxiety and just scared of upsetting someone and getting in a confrontation
or even just being noticed.
@@RobertCondonSunnyTurtle ah ok, that's fair enough, thanks for being honest.
Are you in the position to get a cheap spare set of goggles? I kept my first box set I got with my wizard, I take them with me if I'm flying somewhere that I know people walk there dogs. I keep an eye out obviously, plus I've got a spotter 100% of the time 🧐......
I find this helps to show how fun it is to 'fly like a stunt bird' and that I'm just enjoying my free time, not spying on people or practicing dropping of drugs ha.
@@sulawesi-steve Yep got a spare set of Goggles and a little hand held display. I almost always have good experience with people just been curious. It's mostly just in my head. Someday I am good and really enjoyed flying others I just can't get out of my head and can't barely fly. Thanks for the advice though. I've been flying for fpv over 8 years now and have only had a few bad interactions but many many great ones. I had some bad times where I just stopped flying but have always come back because this hobby is so good for me.
According to a propeller tip speed calculator, at 65,000 rpm the tips of a 5 inch prop would be supersonic, traveling at 966.8mph. That explains why those powerful race drones are so loud, but I still don’t quite think those props can handle the drag that occurs when the tips go supersonic…although when I compared the prop design of a race quad to the prop designs of planes that have supersonic propellers, the quad’s props look like they’re gonna handle it WAY better. Just wonder if it’s possible to make a race drone with supersonic propellers to make it super loud and fast
11:26
I really like that sound. Not being able to hear as much of the speed change from acro flying makes them a whole lot more stealthy
Very interesting and unexpected for me just how much softer the sound was with the octo-blades.
I like the way you can come up with stuff and have a good reason... wild life filming!
That's always the goal!
Qualitatively speaking, for the same diameter,
number of blades: 2 8
RPM needed for certain thrust: high low
noise: loud quiet
top speed (high-speed efficiency): high low
low-speed (hovering) efficiency: low high
Dude! Everything you do makes me want to try whatever the thing is you're experimenting with. Your videos are inspiring, even when you're trying crazy ideas.
8 sounded really nice! I think the higher pitch also made it not as shrill sounding.
The biggest thing I noticed was with the 8 blade, there was almost no echo compared to the other louder blades. So it's definitely a lot quieter overall.
Don't know why, but the quick transition at 1:21 with the full blown back hair cracked me up. Great video Nurk
Snap roll sounds extactly like when my cat sneezes 4:06
At 12:00mins. The way you laughed bro is nothing short of happiness. I can't wait to get into this
This is how rotor riot episodes used to be before they started shilling equipment.
Corrected and I loved watching it then... Haven't watched a RR it well over a year.... I believe since the drones vs car windows ep I believe is the last one....
I might get a set of these to try on my long range build to see how much it effects efficiency.
poor efficiency
Affects*
The "FPV-Nerd-After-Punchout-Giggle" at @10:39 😂🤣😂🤣😂🤣
Ong fr lmfao that would be me bc I love doing punchouts. It already sounds and feels epic on a tiny whoop. Can’t imagine how epic it would be on a 3-5 inch quad
there is lot of aerodynamic physics behind this experiment, which could explain why is proper diameter, number of blades and rpm does it's job... The main idea is that only diameter increase flow(volume of fluid per minute) which increases thrust, and explains why bigger drones fly more efficient. Number of blades increases pressure, but decreases flow, that really helps to increase "grip" of the drone. The most efficient setup in theory of hydro and aero dynamics is to have only 1 blade, but you'll have unbalanced motor that makes it inefficient in terms of tribology of bearings, that's why the most efficient drones use 2 blades. As for high rpms(which highly increase pressure, and flow a little bit) which you have to use in that case because you don't have enough flow because of small diameter of props shows bad effect because you have something like cavitation in water at pump input because of low pressure when sucking, in the air you have vacuum at the edges of props which also could be said that you are running props with a speed higher than speed of sound. So when you are running 8 blades you have less flow and less air goes at speed of sound, that's why they are much quite than 2 bladed which have much higher flow
I just did the mathematics. It's obvious when you think about it. If you halve the blade diameter and quadruple the number of blades (of the same angle), then you get the same lift at the same RPM, so it's a straight swap on your current rig, without changing motors, ESCs or batteries. It would be interesting to see what impact such a change has on noise level, air speed and agility.
We played around with 8 blade props years ago. Back in the CC3D days and the bite is insane. Super locked in, 2 and 3 blade props felt sloppy back them compared to them.
The are faster at mid, throttle for sure but really caused mega sag if you went above about 70% throttle.
This was on BH 2205 2522kv motors and 4s 1300. They felt amazing but they pulled so much amps that it literally was unflyable even on a totally fresh pack... After a, min of flight if you got on the throttle at all for any length of time it would cook a esc or sag so badly you would have to back off...
The 6 blade 5 inch props was halarious...
What's fun is to take 3in props on a high KV 4s 5 inch build and run 6s. The motors have so much torque with that little prop that it literally man handles them and response is so quick and clean and at hover it's making some noise lol... Wot on a unloaded 3 inch prop on 6s on a 2900kv really screams.
Dude I love my octoprops on my cinewhoop super grippy efficient surprisingly and quiet!
I expected it to have lame punch out on the 8 blades but what the hell🤣🤘
So sick!
I'd love to see those 8-blade props tested with ducts. I'd expect more power (better efficiency due to tip vortices being prevented) and maybe even quieter.
I love the feel of torque on a 2 blade quad, but as for flying, I enjoy 3 blade with an aggressive pitch the most. They always feel locked in, faster and are soooo quiet!
Dang just missed it. I do love my hq 6 blades on my cinewhoop.
I use the same on my cinego.. they're great..
Just got some for my protek25, hope it works
So, a little math here. The circumference of a a 5 inch prop is 15.710 inches. That means a 5 inch prop tip at a potential RPM of 65,000 would be traveling at 1,021,150 inches per minute, or 16.1 miles per minute, or 966 miles per hour. That means that weird sound hat you are hearing is the prop blade is likely breaking the sound barrier, and becoming much less efficient. The eight blade props would be doing 677 mph at 65000, which under load will not reach that rpm, and is staying under that sound barrier.
1,416.8 fps if people are looking for that measurement
966 is superso at Mach 1.2. So yeah, I bet the prop is supersonic
I’ve been obsessed with quiet quads for ages now I’ve found the bigger the prop with lower kv is best great video though
Those 8 blade props sound SO GOOD!
Who would even try those thing? And still get some nice performance results. Keep tinkering, you're onto something.
Of all that stuff in the video the thing that got me most excited was the proper use of the word "maths"
I just bought my first drone. Zero Features. Just a basic all piloting all the time drone. Loving it.
Just the fact that I can get so much practice piloting. My buddy smirks when I am flying, because I just fly out a ways, circle back, establish hover and land accurately.. I was doing it with a store bought drone in the wind. I did my first attempt at a flip with it a few minutes later and lost control though. This is what happens when you let your friends bait you into showing off. Drone is fine.
Flown a Phantom before. It was almost too easy to fly. I started out years ago in helicopters. So it seems to transfer well.
That honestly makes sense, more blades make more thrust at a lower RPM, more blades cutting the air is less turbulent, so less noise...??! Maybe I’m crazy I dunno, but it’s crazy how quiet that is
HQProps also make 5x4x6 that could get you a nice balance. Would be interesting to see how different the flight time would be with 8-blade props on a light 5" race build.
I want 5 inch version of those 8 blades
Same thought.
I'll reach out.
This has to be one of the coolest videos I have seen in a long time. i have been trying different things with my babyhawk2 hd its always fun
I love it! Very quiet for a beginner would be excellent! Sound too loud is sometimes scary for many people and neighbors! You guys should produce the quite and new 64 blades by Nurk FPV.
I personally don’t like quiet race drones. To me, they should be like mini fighter jets which is loud, fast, and highly maneuverable. In fact I wanna find out if it’s possible to have a drone with props that go supersonic which would give u extra thrust, and a LOT more noise lol. If it is I would love to get an fpv quad and install more powerful motors on it with a very specific propeller design that can handle the drag when creating shockwaves on the tips due to going supersonic
You can take inspiration from the aerospace industry. GE's GE9X has similar design in blades. For a few reasons.
1. Way more effective in power to fuel consumption
2. Noise levels dropped dramatically.
You're seeing and testing GE's theories and might even realize it :)
that 8 blade setup sounds really good! and i's noticeably quieter !!!!
In what seem like the old days, I used to run 5S on 2600 kv F40 Pro V2 motors. This was in the days before Betaflight had a motor output limit. Tuning was difficult and never perfect, and the best I could really do was put a throttle cap on the radio to keep from pushing the props too hard.
When I'd flip the switch to bring disable the throttle cap on the Taranis, the Racekraft 5051 props would scream like a banshee. The sound was just ridiculous. On any 5" prop.
The smaller prop being quiet does make sense.
The 5 inch could be breaking the sound barrier while the 3 inch is not. Another way of looking at it, is that all the noise your hearing from the 5 inch is the sonic boom of the propeller tips.
I bet and to prove it, I calculated the tip speed of the 5 inch propellers at 65,000 RPM and sure enough, it is supersonic at 966.8mph. Another thing is how it sounds at 11:26. It had a very distinct “buzzsaw” kinda noise. I heard a 4 inch quad before and it sounded mainly like a “whoop” or “zip” instead of that kind of intense shredding kinda sound. It was still the LOUDEST drone I’ve ever heard tho! I would love to get one with supersonic props and basically destroy ppl’s eardrums lmfao. That is why I love race drones
Amazing discovery, keep trying more blades.
8:45 I think you can hear the PID fighting top and bottom right there. The motors almost sound like their chirping.
This was fascinating! So is there a reason NOT to just use 8 blades all the time? I’ve been looking for quieter props for a long time, so I’m considering trying these 🤔 What’s the reason for 3 inch on a 5 inch though?
Sooo. In aerospace engineering this is an entire field of study. Basically, what it comes down to, is more blades == less efficiency. At those speeds, a two bladed prop will probably save you some battery power and handle about roughly the same as the 8 blade, however, the two blade prop experiences less drag to spin up to speed, so it uses less power to spin up to the same speeds as the 8 blade. when you start to get to super sonic speeds, thats when a propeller starts to warrant a fan shaped design. Like in a turbojet engine.
I'm not an engineer, but I from what i understand, thats where the science of blade numbers comes in.
More blades = more more juice to power it with marginal or negligible increases in performance. You can look to WW2 to see why they chose to keep planes with 2 or 3 blade props :p
But i guess its a decent trade off to make your drone quieter O:
Love these videos! Your video on the 160mph with Josh was my favorite, but now time to get some props.
THanks again-
Interesting to see you starting to do "appetizer" bits at the beginning - its really valuable for Facebook retention, especially considering their ad rates are way better than youtube.
I'm the " that's not right" guy today. I'm just so excited $gme blew up again today. Get on the shuttle to the moon at market open tomorrow!!!!!!!
65k unloaded with no battery sag.
As prop rpm increases the drag increases by square. The motor can produce x amount of torque regardless of rpm.
2000kv 6s = 15krpm at half throttle and 20k at full throttle. Current consumption 5a and 20a respectively.
2600kv 6s = 20krpm at half throttle and 20k at full throttle. Current consumption 20a and 80a respectively.
Battery on fire huh?
Lets say this motor can produce 2 ft/lbs of torque and the prop requires 2ft/lbs to spin them at 20k. A perfect match of kv to the prop would be the prop requires 2ft/lb at the max rpm the motor can produce, say 20k rpm. The motor can't magically pick up stator volume to quadruple the torque output to 4ft/lbs and pick up twice the rpm.
Now lets say the same setup with double the kv. The motor will only spin the motor to 25k with 2ft/lb of torque. Above that the motor will not spin faster however it will pull more current effectively turning the wasted wattage to heat.
At the end of the day we would like like the system to be scaled where max throttle is 5% bellow max rpm of the motor/prop combo for decreased angle of attack when the prop unloads. I suppose we could do an 8s battery on 2600kv and cut the throttle scale in half to produce a sharper bell curve in rpm up to half throttle.
i had a 2750kv 5152 gemfan biblade setup. it was the loudest and most hilarious thing i ever flew (4s). drained lipos in about 1:20 at the limit lol
Your analog camera gives me strong nostalgic vibes of 90s
I did a mix of old dalprop 6 inch biblade in front and modern triblades 5 inch in the back on 2208 2450kv and this thing sounded like a monster. Very loud low pitch sound that was amazing. It was flying like crap but the sound was crazy
Please do a video with 4x modern EDF units (like those fancy CNC'ed aluminum ones) :)
i am using same propellers on a simple DIY cinewhoop with 3s battery. major difference is the sound it generates. it is quiter and thrust is more than 3 blades. good thing isthe load on ESC is not much different. 26 amps in total vs 24. but very fragile when used out of a duct, and acetone warps them FYI.
omg that thing is so cool with 8 blade props!
Wow I love how quiet that is 😊
Absolutely awesome!!!! Can't wait to get back into FPV when i get back from Japan.
When changing prop blade #’s do you have to tune the drone differently to keep the motors from heating up? Or is that usually not an issue?
I suspect the frequency of the noise made by the 8 blade props is above that of human hearing capability and all we hear is the air turbulence from the props.
what is cool is you can easily make a standard 5 inch 4s high kv drone that you can alternatively put a 6s pack on and these little props on for quiet flying.
Exactly!
Thanks much. very useful information.
Funny video but interesting and educational at the same time. Thanks for Another great vid Nurk!
65,000 rpm is over 1,000 rotations per second. Try to wrap your head around that!!!
Soo... what is the 5inch tip speed??? Over 1400kmh. What is the forces on the prop? Around 200kg... This is not possible without exploding the prop.
@@NiNo9 its a 3 inch prop
@@NiNo9 There is a lot of drag that slows down the props and maximum rpm is also limited by the ecs (mosfets don't switch instantly). It would be nice to see real rpm in osd.
the guy in video just did some simple math and thought that's it. 65K. But it's 65k without resistance (no prop). with prop is way less
Fantastic experiment. Thanks.
what you have is no longer a propeller but a UDF - unducted fan also called propfan
Totally changing my props to 8 blades!
I feel sorry for the batteries! Very cool to see and hear the 8-blace props.
Im late to the party, but I’m assuming the 8 blades just add to the disc surface, obviously, and just acts like more of a “wind brake” so to speak, making the snaps more precise and snappier. This is really cool!
8 blade props ordered!!! Very cool video!! Thank you
Have fun!
8 blades sounds sick , what a beast.
Omg... I'd love these!
two things. First, have you tried to put them on a 3-4 inch frame? Second, I wonder if they might come out with a 4 inch 8 blade prop?
The first option might save some weight. The second option would reduce rotations and the pitch a little.
Extra blades means you are pushing more air at the same RPM as with the other props but the 8 blades are smaller in diameter to lower turbulence between the blades. A 5 inch version of the 8-blade with more powerful motors would be awesome to see.
I wonder if a 3.5 in 7 or 8 blade prop would be a replacement for a 5 inch blade?
it sounds like a power drill lmao. love it.
The motor KV rating is unloaded RPM per volt, not the loaded RPM per volt. The actual rpm of the motor will vary depend on the load you place on the motor. The props will be spinning no where near 65 thousand RPM
Um I bet the 2 blades ones will spin at at least 64,000 rpm bc of their low pitch angle. Those blade tips sound like their going either close to or slightly over the speed of sound bc like listen to how loud it is. Most 2 blade quads aren’t that loud but ofc it can be the camera’s mic and stuff
0:07 after the copter, there was an inversion trail
Great video. Buying some of those 8 blades. A 'stealth' 5-inch; awesome 🙂🙂
Its like 2015-2018 again? Where people realized more blades = more grip making the quad feel more locked. In the end people stayed with 3 blades for racing and freestyle.
Indeed
bro that was dope, but i just spent like 5 minutes thinking my monitor was dirty/broken @1:19 you can see a < sign next to your head in the sky (it's in the whole video). lol
We fixed that today sorry
@@NURKFPV haha all good my man. my monitor needed a good cleaning anyways.
Look up air zipline drone propeller. It's a propeller that uses technology in nature to reduce noise. Cool looking tho.
Thanks for all the AWESOME videos!!! Really appreciate it alot!!! Gives me good ideas for my videos also!!!
a one bladed prop is the fasted only reason people started to fly tri blades was how they feel in the corners you dont have to apply much more throttle in the corners compared to bi blades so its easier to fly but bi blades are faster but harder to fly
The more propellers blades you have the more surface the blades have. those blades might equal the surface area of a normal 5" prop.
This is amazing!
Would love to have some of those for my DJI mini two. Same diameter as stock. Would be awesome to see how they perform on the mini two especially at high altitudes.
Almost reminds me of EDFs with the sound.... time for an EDF quad
8 blades were awesome
after watching this video i can safely say "I Studied the Blade"
seems like the octo-blades on a cinewhoop would be more appropriate than the triblades that they all (almost all?) ship with. Maybe we should push this to be mainstream, at least exclusively for cinewhoops... now you got me thinking about tinywhoops... who wants to make a hexablade for a tinywhoop? Any takers? lol
So 8 blades in the ducts on the Cinelifter? How much quieter would it make that beast?
Seems like this is what your ducted thick needs. Will need some beefy motors for 7 inch octoblades though.
I'd like to see 7-8 inch running 8 blade 5 inch props if they even still exist.
That sounded way better then the 3 prop.i liked the 8 blade way way better
can you put the largest blades like make the arms on the top so they won't hit anything on the top and try to get the blades as close to each other that you can
Interesting findings, ordered the props, can't afford the rest 🤣 Will gift them to little brother since his eachine is a hella noisy little ting, drives the neighborhoods' barking alarms, AKA dogs, mad! and they in turn drive me mad!
Another fun video to watch...interesting comparison's as well. Seems like you might have another potential 'Side-Hustle' here. Selling those sound bytes (FPV Zooming By) as stock audio clips. Has potential. 😲😲😲 On a side note, your probably the only guy I would trust flying FPV in tight circles around me... *man, that things was moving!*
I like how you flew top speed right near yourself and the other guy. I'm gonna try that now. Wish me luck!
You alive?
@@Nathan-qt2zi I am however, I did get scared at the last second, flinched, and flew my Xilo right through the back window of my sister's Land Rover.
Glass coverage FTW!