I have this irrational fear of swimming close to boat propellers. Ever since I watched the movie finding Nemo when I was young, seeing his dad nearly being torn up by the propellor. It gave me shivers.

@lucavanzi

4 жыл бұрын

Buy a stick for the gopro and fear will disappear! Voila!

@tornadotayte

3 жыл бұрын

Submechaniphobia. Look it up man

Okay, now I know what my newest nightmare's gonna be -- getting stuck too close to a boat propeller going at full blast. Thanks for that. 👍

@anilallipilli1569

3 жыл бұрын

kzread.info/dash/bejne/h42mtbqmm7Kcfs4.html

The last test look really safe!

@apexpreciousmetals

6 жыл бұрын

They have a fetish with getting their fingers chopped off

@lucavanzi

6 жыл бұрын

Or thet use a pole for the GoPro.

@dirtrider88

4 жыл бұрын

calm your tits. just because a camera is near something doesnt mean a person is near it

@leibertblyat5538

3 жыл бұрын

@@dirtrider88 haha calm your tits ohh that's hilarious

@aaron-fauth

3 жыл бұрын

@@lucavanzi can you get a joke?

I'm watching this because it looks like a fan.

@john-martin

2 ай бұрын

Im watching this because it looks fan.

Yes there is cavitation and it is not what is coming out of the rear which is exhaust but around the blade, this is inherent to the quality of this blade

@AB-80X

4 жыл бұрын

It looks like an aluminium prop, so it is what it is.

Thank you very much for the opportunity to see the cavitation underwater. Brilliant video.

Nicely done very interesting

Theres a small cavitation on the prop flukes at full speed but its normal for the type of prop and the angle of the flukes and the stream you see shooting out from the middle of the prop is the exhaust , not heavy cavitation

@alosiousantonygeorge8972

Жыл бұрын

how can we minimize cavitation by changing its design?

@timwevner

Жыл бұрын

By making greater propeller wings, maybe use different angles for different speeds and cooling the prop

Cool! It looks strong.

Funny how you can't see exhaust coming out when the engine is idling. I expected to see bubbles even then.

@billyboots3730

4 жыл бұрын

Probably has exhaust ports on the leg like my evinrude

@allgaming4045

4 жыл бұрын

Wait the exhaust comes out the propellers

@DennisSantos

4 жыл бұрын

@@allgaming4045 Well, the hub.

@AB-80X

4 жыл бұрын

@@allgaming4045 It's called through hub exhaust. Most common thing on outboards.

@ErnestoFavor76

3 жыл бұрын

The exhaust gasses come out of the back of the engine hood (above water) while idling, only when an outboard throttles up in gear they gasses come out of the propeller. The bubbles at the end of the blades is a light form of cavitation. Water boiling because of the low pressure. Think its an aluminium prop as it occurs quite soon. A stainless prop has better performance.

"Conn, sonar sierra 1 is cavitating"

@InfiniteSith136

3 жыл бұрын

A fellow cold waters player? I see you're a man of culture as well

Thank you sir, knowledge is power 👍

Surprisingly quiet. I thought it got louder when your further away due to that buzzing sound

I don't even own a boat nor have I ever even been on a boat, why am I watching this

@ALEXANjunior

4 жыл бұрын

It's called curiosity. Till now you have good curiosity though. I hope you never have bad.

That last part took the breath outta me.. I thought he was gonna get pulled in from the side!

I love that little whirlpool at the top

Cavitation happens with all props, its high engine torque or rpm that causes it. Slow rpm after holeshot cavitation will stop.

And this is why a sportfish vessel will out fish every outboard. Harmonic and no exhaust trail make it extremely clear for your baits behind boat look deadly

WOW COOL!!!!!

Is that a yamaha 60 outboard as i have one and it looks identical

It was one of my first videos with gopro. Next time I'gonna shoot in 720/240 fps and then slow down even more.

it's cavitating , it can damage the shaft due to vibrations

Why has the inlet been blocked off?

hello, it look great. i need a little help about the selection of motor with regards the weight of the ROV , example, if you move a 20 kg ROV at speed of 4 knot in salt water , then how you select the motor, how much thrust you required to move with constant speed? if you have any material or formula, please help me into this.

@jithinkl7300

4 жыл бұрын

Did u get ur answer?? If so, plz tell.. I too have the same doubt

This is meaningless. The hydrodynamics of an engine/propeller pair running while being held stationary, is NOTHING like the flow while it is moving. The flow of water past a prop in motion does not behave this way. What you are showing is a 100% slip situation. In actual use, a prop only slips a small percentage. What happens behind it in those two conditions is way different.

@cadenhutchinson5750

3 жыл бұрын

I was about to say the same thing but you beat me to it 😂

@user-vi3pi9rf7w

3 жыл бұрын

I dunno about marine propeller engines but In aircraft engines there are two types of thrusts commonly referred, installed and uninstalled thrust.

@ballistictank8023

2 жыл бұрын

Bro shut up enjoy the video

@vialeyrichards4244

Жыл бұрын

Who cares about hydrodynamics here? I think it was cool to watch.

@jonv.6213

Жыл бұрын

Still looks cool

That is cool

that was a great video of a propeller I wish I could see one in real life !

@aaron-fauth

3 жыл бұрын

I can tell you I own an out drive but would never go down there to see it

@oldmategio

Жыл бұрын

I hope you never see one by falling out of a boat and being sucked onto it

Video molto interessante🔝, sarebbe bello poter vedere questo effetto con barca in movimento...

@lucavanzi

6 жыл бұрын

Per quello purtroppo il bastone della Gopro non può essere d'aiuto, sto pensando di immergerla in un fondale di circa 1,5 metri, e navigare sopra la camera che poi dovrei recuperare, purtroppo lavorando in estate non ho il tempo di fare tutto quello che vorrei.

thank you for sharing!

thanks. maybe putting a cage around the fan, block fish from getting slashed by propeller

@James-xc9zy

5 жыл бұрын

But also fuck up the water dynamics of it Have you grown up? When the fuck has anyone chopped up a stupid fish with it

@WhiteMagicBusa

5 жыл бұрын

@@James-xc9zy LOL. He could've at least said manatee lol. Fish swim out the way long before boats get to them

@rev9fan1

4 жыл бұрын

Then the fish will just be fish food...

@Moog604

3 жыл бұрын

@@James-xc9zy alot of people have asshole

@garden0fstone736

2 жыл бұрын

@@rev9fan1 fish are friends not food

is this terrifying to anyone else

@Moog604

3 жыл бұрын

No

@shizenkv

3 жыл бұрын

@@Moog604 😔

What’s the air that are coming out?

I know it's a tiny propeller but this still scares me

that was ventilation as the boats not moving but the water is it sucked air from above the anti-ventilation plate and then held it. you should come off the throttle then back on it again.

@joshwilliams2082

7 жыл бұрын

It is the water behind the propeller boiling due to low pressure, not air. This is cavitation.

@samuelzehdenick4216

7 жыл бұрын

Outboard engines have their exhaust through the propeller. Cavitation happens on the front side of the leading edge and on the tip of the propeller due to suction and vortex.

Is there ment y to be a water jet in the middle of propeller

im tired.

And this test proves ? Throw a hydrofoil on it and compare . (Something) lol

@AB-80X

4 жыл бұрын

It proves nothing. But you can determine how bad your prop cavitates.

The best

This is how to create oxygen under water.So that you breathing like a fish.

Why the engine is so small??

Mooring is OK!? Hello from Saint -Petersburg Russia! Chmoki!

PRO PLAYER BROO IN GAME HAHAH😂😂😂

What type of engine is that?

@evilblackrolf

6 жыл бұрын

Mohdaliffhassan Hassan thats a yamaha , probably a F50 or F60

@sethh1898

5 жыл бұрын

Yamaha

I wonder Where did the air bubbles come from underwater ?

@murphymartin6597

2 жыл бұрын

The water is actually boiling. High pressure causes this.

@murphymartin6597

2 жыл бұрын

Or maybe it’s lower pressure. Forget which one.

I needed to know what one looked like because I was drawing one !

I have Submechanophobia and this doesn’t trigger me an awful lot but I wouldn’t swim next to even a prop this small Edit: Submechanophobia is we’re you have a fear of something large submerged under water, for me propellers, large underwater structure and anchors are the worst.

@levicook8488

4 жыл бұрын

I googled this and clicked images... Yeah fuck that.

That's a lot of Cavitation

@kopronko

6 жыл бұрын

Not neccesarily .

@fruitella196

6 жыл бұрын

Subnautica?

@hardcoregaming2090

6 жыл бұрын

why do you think this is not cavitation ?

@dannyhuynh-nguyen6911

6 жыл бұрын

A little bit of both of you know what I mean

@sethh1898

5 жыл бұрын

Hardcore Gaming exhaust

Yamaha

can someone explain to me the bubbles

@levicook8488

4 жыл бұрын

The bubbles comminf from the center of the prop are an exhaust trail. The bubbles forming at the edges of the prop are cavitation. When water pressure decreases, so does the boiling point of water. The back side of the prop creates a low pressure when quickly displacing water. This low pressure causes the water to "boil" and that is what causes the bubbles.

Submechanophobia

@leemilica

6 жыл бұрын

[ Agressia ] if you are a crybaby. How can this little propeller scare you?

@deadanimasher678

5 жыл бұрын

@@leemilica Little ones don't bother me. It's the huge propellers underwater that do. And it's not because I'm a crybaby. I watch and play horror games and movies daily XD

@leemilica

5 жыл бұрын

@@deadanimasher678 underwear?

@leemilica

5 жыл бұрын

@@deadanimasher678 just like me

@germanfernandez7944

5 жыл бұрын

@@deadanimasher678 Same here :(

Which motor used for this?

@VegemiteVoyage

4 жыл бұрын

Yamaha 60 outboard

This is NOT CAVITATION!!! People should know what they are talking about before spewing ignorant comments on YT !! A outboard engine exhaust comes out the center of the prop, that’s exhaust not cavitation!!

@youssifgalal2154

6 жыл бұрын

dude your so wrong. Exhaust comes from above, when engine is idle there are no bubbles coming out. Its cavitation

@muddpuppy07

6 жыл бұрын

Still have one blade cavitating as well

@FluppiLP

6 жыл бұрын

you can literally see cavitation coming from the blades, What the f*** is wrong with you?

@Napoleon_Blownapart

6 жыл бұрын

If you ever fired up an outboard engine outside the water (to wash the cooling system with fresh water), you would notice that, in fact, the exhaust is at the center of the propeller. That is not all cavitation. Cavitation bubbles would appear mostly at the blades, not at the center. The blades are engineered to keep caviatation to a bare minimum. Since the engine is being accelerated, the amount of air passing the combustion is so large it makes that bubble tail.

@Will_Russell

5 жыл бұрын

Youssif Galal either you don’t have an outboard or you have some weird model with an odd exhaust system. Nearly all outboards have the main exhaust coming from the center of the prop. When it’s in neutral there is minimal exhaust coming from that vent. There was some cavitation on this blade but the main source of the turbulence is from exhaust.

what happens when a person comes in?

@lucavanzi

3 жыл бұрын

He dies

@Moog604

3 жыл бұрын

They die

палец не пробовал засунуть?

lot of cavitation

@timsussenbach5376

4 жыл бұрын

Thats mostly because its standing still

That is ventilation, not cavitation. Cavitation is when the propeller pulls air to it from the surface. That is why an anti-cavitation plate is positioned between the waterline and the propeller. Ventilation comes from drilling holes in the exhaust ports of the prop to let exhaust out at the fins of the propeller, thus causing less drag which allows the engine to spin a bit easier. It helps the boat get on a plane faster.

@levicook8488

4 жыл бұрын

Wrong. When water pressure decreases, so does the boiling point of water. The back side of the prop creates a low pressure when quickly displacing water. This low pressure causes the water to "boil" and THAT is where the air comes from. This is cavitation.

0:28 udaranya muncul dari mana ya?

@mjoeashjasper

3 жыл бұрын

That's the exhaust

Why not upload in 1080P 60fps?

@ 5:15 ...

Biker

Toy ship

cavitation from hell

no catalytic converter no nothing. Just dump the exaust into the ocean. disgusting and disgraceful!