Pushing 8 blade props to 65,000 RPM

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:
8 Blade Props: bit.ly/3qRmKDr
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Learn to build a drone!: • How to Build a Cinemat...
Full parts list on this drone with affiliate links:
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Goggle Battery Replacement: 18500 Batteries - bit.ly/2UyU9Vg (go in powerplay)
Radio: Taranis 9XD - bit.ly/35kYMsb
TBS Crossfire : TBS Crossfire - bit.ly/2BVwMgX
Solder: - bit.ly/nurksolder
Soldering Iron: TS100 - bit.ly/2KeBY5e
Lipo Charger: HOTA 15A - bit.ly/3piuH4e
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#fpv #props #ducted

[@DavidiiXV]

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.

[@falz]

i have 6-inch bi-blades, but only can fly them far away from civilisation. it eaven scares the crap out of me. hehehe

[@BseriesPro]

Not far off now eh

[@Flumphinator]

You didn’t know how correct you were when you wrote this.

[@JesseGudgeon2007]

​@@Flumphinatoryeah 😢

[@Pile_of_carbon]

Question: What's the best 5" prop? Answer: 3" 8-blade.

[@NURKFPV]

Rofl

[@nixie2462]

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.

[@holdenmilo24]

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.

[@ahmirsamson3913]

@Holden Milo Instablaster =)

[@holdenmilo24]

@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.

[@NestorZaharopoulos]

imma hold out for 16 blade.

[@flyingmonkey8245]

I’m waiting for the 69

[@dp4advanced234]

420

[@chrisgicky2215]

Do dual motor mounts with 8 blade.. there u go, 16 per arm

[@charlesdarwin6299]

Low turbulence

[@mariopuzo4509]

Half blades.

[@calif94577]

Would be cool to see a 5” 8 bladed prop fly in this set up.

[@holla_academy]

Nurk: shows us that 8 bladed props exists Me: Buys 5 sets before even seeing the comparison

[@crezzlin]

Same 4 sets haha

[@timm1065]

now they are backordered!!! damn.. Im late to the party

[@holla_academy]

@@timm1065 try RDQ?

[@timm1065]

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

[@nixie2462]

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)

[@TheDro]

7:35 LTT Was here

[@NURKFPV]

Rofl

[@mthompson965]

More like LDT 🤣

[@JeffreyWelch]

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.

[@RobertCondonSunnyTurtle]

I often have anxiety about the noise of my drones this might be worth trying for me.

[@sulawesi-steve]

Can I ask why?? Are you scared of your own flying ? Or just not like the sound?

[@RobertCondonSunnyTurtle]

@@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

[@RobertCondonSunnyTurtle]

or even just being noticed.

[@sulawesi-steve]

@@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.

[@RobertCondonSunnyTurtle]

@@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.

[@muhamedd]

Snap roll sounds extactly like when my cat sneezes 4:06

[@scooterfpv8864]

👍👍 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

[@Smoothinto2nd]

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.

[@B_Ripping]

Love these videos! Your video on the 160mph with Josh was my favorite, but now time to get some props. THanks again-

[@MrStevegibb]

This is how rotor riot episodes used to be before they started shilling equipment.

[@EDCandLace]

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....

[@flowstate_link]

I like the way you can come up with stuff and have a good reason... wild life filming!

[@NURKFPV]

That's always the goal!

[@richardmcguigan1382]

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

[@Gosuminer]

Very interesting and unexpected for me just how much softer the sound was with the octo-blades.

[@Max_Marz]

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

[@TheDroneNerd]

Funny video but interesting and educational at the same time. Thanks for Another great vid Nurk!

[@timbell8208]

Absolutely awesome!!!! Can't wait to get back into FPV when i get back from Japan.

[@kasuraga]

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.

[@retrodudefpv]

Great video. Buying some of those 8 blades. A 'stealth' 5-inch; awesome 🙂🙂

[@HellaCopter]

Dude I love my octoprops on my cinewhoop super grippy efficient surprisingly and quiet!

[@JP-qq2kn]

Those 8 blade props sound SO GOOD!

[@captainsumtingwong]

The "FPV-Nerd-After-Punchout-Giggle" at @10:39 😂🤣😂🤣😂🤣

[@SirensAndAlarmsOfNorthernIL]

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

[@JamesKing2understandinglife]

Fantastic experiment. Thanks.

[@oBseSsIoNPC]

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!

[@JooorgeMT]

Don't know why, but the quick transition at 1:21 with the full blown back hair cracked me up. Great video Nurk

[@stormchaser8472]

omg that thing is so cool with 8 blade props!

[@rccrazy]

I expected it to have lame punch out on the 8 blades but what the hell🤣🤘 So sick!

[@contagiousRC]

Thanks for all the AWESOME videos!!! Really appreciate it alot!!! Gives me good ideas for my videos also!!!

[@DavidOwensuk]

8 blade props ordered!!! Very cool video!! Thank you

[@NURKFPV]

Have fun!

[@MyNguyen-hz1gn]

Thanks much. very useful information.

[@lorenzolamar5369]

At 12:00mins. The way you laughed bro is nothing short of happiness. I can't wait to get into this

[@SirensAndAlarmsOfNorthernIL]

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

[@CoolSirens1000T]

11:26

[@EDCandLace]

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.

[@gmivisualsjason3729]

Omg... I'd love these!

[@--JohnDoe]

Amazing discovery, keep trying more blades.

[@EJ3.16]

Excellent review...!!!!

[@bweber0204]

Of all that stuff in the video the thing that got me most excited was the proper use of the word "maths"

[@joepowers3731]

8 blades sounds sick , what a beast.

[@stugatz2664]

that 8 blade setup sounds really good! and i's noticeably quieter !!!!

[@y.l.6229]

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

[@DrMacca]

This was fantastic!!! 👍👍👍

[@AdrianoCasemiro]

Who would even try those thing? And still get some nice performance results. Keep tinkering, you're onto something.

[@mikeevans6926]

I might get a set of these to try on my long range build to see how much it effects efficiency.

[@samuelyoung2671]

poor efficiency

[@orangepeel7310]

Affects*

[@MysticalDork]

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.

[@rowanballinger3690]

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

[@marinehm]

Nice! I will have to try them on my 5" if I can find any!

[@liftedmediamarketing]

This is amazing!

[@coskuarsiray]

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.

[@ApplebyInSteam]

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.

[@RidiFPV]

Im definitely gonna have to get some of those

[@peterboy209]

Great props, 👍

[@ernieschatz3783]

I feel sorry for the batteries! Very cool to see and hear the 8-blace props.

[@jiminyfriggit2334]

I dig it man. cool experiment. 🤔😎

[@seandolan]

Wow I love how quiet that is 😊

[@SH-ry2xi]

Awesome awesome video!!!

[@cyclopemedias3718]

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

[@RGMGFitness]

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!*

[@imager09tube]

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.

[@SirensAndAlarmsOfNorthernIL]

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

[@robertmerrill8918]

I want 5 inch version of those 8 blades

[@Aar0n2009]

Same thought.

[@NURKFPV]

I'll reach out.

[@jbcom2416]

Your analog camera gives me strong nostalgic vibes of 90s

[@daveeckblad]

8:45 I think you can hear the PID fighting top and bottom right there. The motors almost sound like their chirping.

[@Eagle44]

Subscribed !!! thanks for sharing🇺🇸🏁😎

[@user-lu2cy9xv2z]

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

[@kevinleetreetimefpv111]

This was a great video. I love the test. I am flying a taycan which Flys great with 3 blade gemfans, but if I switch to 5 blade the motors run much hotter (and I have burned out several motors) but I like the way it sounds and performs though the tune is off. I am not that knowledgeable at tuning but I am trying. Any suggestions on tuning for the 5 blades, cooling down the motors and performance? Thanks, your 12s build is what got me into fpv from the boring drones. Thanks for that. Good luck.

[@propsoff]

I may have to get some 8 blades for my favorite 3incher.. Interesting stuff Paul...👍🏻🍻👊🏻

[@NURKFPV]

I think that the big displacement motors help in a way though so be careful with the smaller motors

[@_DAD-E]

Dang just missed it. I do love my hq 6 blades on my cinewhoop.

[@2toeninja]

I use the same on my cinego.. they're great..

[@SH-ry2xi]

Just got some for my protek25, hope it works

[@ni_wink84]

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

[@PiDsPagePrototypes]

Sounds like the octoblade pushes the sound energy up to higher frequencies, possibly in to ultra sonic region, so the noise is still there, but above human hearing range. At what number of blades does it stop being a prop and become a fan? Are there any swept-blade versions? The five blade sound is like the F1 V10 of the quad world. Now wondering about octobladed phantom, if quiet enough to record dialog while getting drone shots.

[@patregan]

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.

[@wingsfishes]

Great props évaluation . how do you manage the color of lipo voltage which is diplayed on your OSD, in function of voltage level?

[@MCsCreations]

Fantastic flying, Paul! 😃 Thanks for all the tests and sounds! Stay safe there with your family! 🖖😊

[@leevardy852]

I remember old pylon racers using a single blade counter balanced as multi blades would one cause more surface area and two also hit dirty air from the previous blade.... could be worth a try?

[@davefarrell3148]

Would be interesting to see the same with a track setup, would the same "grip" hold out?

[@shawndubay4050]

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.

[@_burd]

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.

[@GarrisonMagyar]

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?

[@freedomoperator6502]

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.

[@flyfree1589]

Two blade prop crazy sound 😁

[@mafiafpv3469]

Love it bro❤❤❤

[@howitzerm777]

Totally changing my props to 8 blades!

[@glenpaul3606]

8 blades were awesome

[@wjfc1968]

Hey Nurk I'm wondering about prop down force? blade tilt in degrees, helicopters increase tilt to the blades to achieve takeoff, such as five degrees compared to ten degrees I'm just guessing. I know it would probably decrease battery consumption but increase speed right?

[@dubmfg]

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.

[@TheMiller607797]

Very interesting what would you say has more lifting power less blades or more blades?

[@Mstom178]

That was so cool doing it

[@bdc1960]

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.

[@RadDadisRad]

1,416.8 fps if people are looking for that measurement

[@SirensAndAlarmsOfNorthernIL]

966 is superso at Mach 1.2. So yeah, I bet the prop is supersonic

[@corpsefpv3154]

I'd like to see 7-8 inch running 8 blade 5 inch props if they even still exist.

[@KwadSkwad]

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

[@fear4funfpv518]

So 8 blades in the ducts on the Cinelifter? How much quieter would it make that beast?

[@danielc.284]

I wonder if a 3.5 in 7 or 8 blade prop would be a replacement for a 5 inch blade?

[@TweakRacer]

Please do a video with 4x modern EDF units (like those fancy CNC'ed aluminum ones) :)

[@EJ3.16]

Nice test,, but can you please tell me what size of motors do I need to have so I can put all this kind of propellers....!!!!

[@ClaraCleary2005]

10:56 I have had a battery go down that fast too. I knew it was dead (150mili ohm on one cell) but I just wanted to see how hot I could get a battery since I didn't care about it. The bad cell popped as soon as I webt above 30%, and that was with an already 70% limit. It was extremely hot because I kept running down the other cells so I could dispose of the battery easier. And when I landed I smelled that smell, and saw that cell.

[@BOPilot5517]

Curious on motor longevity or if there will be any detrimental effect on the motor long term.

[@JamesHavoc84]

Hey Nurk, Wondering what patch/antennas are being used with your rapidfire?

[@biteme4573]

Now that was cool.. did you notice any difference in hndling?

[@rohansully584]

That was fun!

[@crezzlin]

Ace.. could you do a thrust/amp test vs the 5inch props. Really interesting NURK! 👌