WHAT DRIVES A HELICOPTER the drive system from engine to rotor

[@THEfamouspolka]

Free wheel system is like a pedal bike. You pedal, it applies power to the wheel and you accelerate. You stop pedaling and the rear doesn't immediately stop turning.

[@micjbaron]

THEfamouspolka this is a great analogy, was wondering how that worked

[@alexlo7708]

It is called one way clutch.

[@shuntawolf]

Best way to describe the freewheel unit is a pedal system on a 10 speed bike... Long as you're pedaling, you're supplying power to the wheels, you can stop pedaling and the wheels keep going and even backpedal without affecting forward momentum.... Nice vid, thanks!

[@guzgilg]

Shunta Wolf cool analogy.

[@Oldbluestrain]

I work for a well known helicopter company and I use your videos to teach my new, predominantly fixed-wing orientated, Engineers about rotorcraft. Not being able to take them into a real aircraft right now due to COVID has meant your videos are a lifeline! Excellent as always!!

[@PilotYellow]

Oldbluestrain wow that’s cool thanks. Are you allowed to say who you work for?

[@Oldbluestrain]

@@PilotYellow I work for Leonardo Helicopters (formerly AgustaWestland) in the UK. I sent you an add on another social media. I really enjoy your channel, it is technically excellent across the board.

[@olivermsiska]

Hi guys,these episodes are so helping to some of us who have fallen in love with building small helicopters

[@iesikhaty]

The science of helis is pretty amazing! I learnt lots here. I've heard the term "flapping for effect" used in the helicopter world...I haven't found a good explanation online. That, and any other helicopter science would be great to learn about. Cheers

[@Poop-nu1so]

Overunning clutch that uses sprags. Didn't know helis had them. Thanks for the vid

[@Rocketman88002]

I knew two Army aviators who flew Huey's in Vietnam for AHC's and I knew two maintenance guys. They explained the marvels of the rotor system to me. The UH-1 was the icon of Airmobile warfare. Here in the states, both of the guys I mentioned earlier hired on with Army Air at White Sands Missile Range as Range Safety pilots. Both of them were rated in other birds such as the AH-1(Cobra, CH-47 (Heavy Lift) & OH-6 (LOACH). Sikorsky's legend lives on!

[@matildetorres9331]

narration with illustration AND animation would simplify it very clearly. but the verbal explanation IS pretty straightfoward. like the video though.love the channel too.👍🚁

[@Fawaduddin]

Helicopters are one of the most amazing pieces of aviation engineering. It intrigues me everytime when I learn how they work. Good work on the video too.

[@jonsimon9247]

Great explanation! I always thought that the capability of auto rotations in a helicopter was a bit of a convenient coincidence! Didn’t know there was that much engineering and design behind it!

[@SkidsUpAviation]

Absolutely a great explanation! Thank you!

[@michaelcolletti790]

Amazing explanation! Love listening to and watching your videos. So very informative, comprehensive and easy to understand!

[@capenafuerte]

Very informative video explaining the inner works of a helicopter. I’ve been wanting to know these things. Thank you.

[@jamiesmith6838]

Another great video from a knowledgeable pilot! Thanks again. Orange copter is nice!

[@Conn653]

Reminds me of the "Centrifugal Clutch" used on Go-Karts. Same concept just larger equipment :-)

[@Keymanofco]

Snowmobiles are the same way.

[@fudogwhisperer3590]

The only caveat would be that if the snowmobile was going down a hill and the engine quit, the track would disengage from the engine and still continue to freewheel until the bottom of the hill.

[@Keymanofco]

@@fudogwhisperer3590 Snowmobiles have brakes on the track operated by a hand lever, just like on a motorcycle.

[@jpolar394]

Conn653 .... yes, you must remember the centrifugal clutches made by mercury then. Brings back memories.

[@hotrodray6802]

Coaster brake on a bicycle. Drives one way, coasts when the "engine" stops. Rotor brakes are totally separate units, like a car disc brake on the helicopter driveshaft so that when shutting down, the rotor doesnt turn for 2 minutes. Not all helicopters have them.

[@Imustfly]

Think Nordic Track ski machine for an everyday example of a sprag clutch. Locks up on the rearward power stroke....freewheels as you bring your leg forward. Each foot connected to the same shaft and flywheel assembly, but able to move and create power independently due to the sprag clutch.

[@Novadean1]

Yes understand, appreciate in a Autorotation Hub and Tail run's Padel still in work 10 - 4 like in a Bell 47 - thank's Micha !

[@mariolofaro8330]

I'm always happy for your informative videos!

[@DanielBilan]

Think about the overriding clutch the same way you think about stopping pedaling your bike!

[@surinderdhiman]

Amazingly explained easily understandable. Thank a lot brother for this never exposed and useful information.

[@muhindoyesse2432]

Good lecturer

[@fanei90]

This video is fantastic, great knowledge. Shared this with my girlfriend who loves your videos as well. I try to show her all of your videos for helicopter education as you explain aviation technology eloquently. Can't wait for more videos.

[@chippyjohn1]

3:05 Free wheeling, Over-running (not over-riding), slipper, one way or properly called a Sprag clutch.

[@parkerhubs]

Great video! Loved the explanation of how that works. Made great sense to me. Safe flying!

[@pilotpeego1820]

Awesome video. Very informative!

[@billdennis2993]

Thanks PY for the informative video. Stay healthy.

[@ndeepowder]

The thumbnail said you were going to show me about the rotor head and how control inputs are actually applied to the rotating blades.

[@feelingzhakkaas]

excellent informative video..... the mechanism you explained seems like Paul-ratchet system which works same way ...i.e. one direction free rotation ... God bless you.

[@PRMarshall]

I’m in zoom flight class and I have to present drive systems to the class, this helped thank you

[@outlawamps]

Good stuff! In model Helis (and other applications) it’s called a one way bearing.

[@Alexanderwichers1812]

Very good explanation man👍👍👍😜

[@BoB4jjjjs]

Well, thanks to you I did learn one new thing today, so you didn't waste your time. hank-you for such an interesting video.

[@slawglimini8013]

Freewheel or one way clutch is so main shaft won't snap from right and left tensions when you add and put down rpm on engine

[@karamkhan7077]

Great information dear why clutch system have not installed for to release both upper and tail puly

[@jagadisht7572]

Nice explanation

[@WSQuest]

Very nice video. Thank you.

[@ForFunFlyer]

I just love these tech episodes! The flying ones too, but I just love aviation technology! 👌🏻 That's why I do regular tech episodes myself, besides flying videos 👍🏻 Keep them coming!

[@mikekati6226]

Thank you very much,very clear.

[@sadgunak.s6670]

Hi thanks for the video, could you please help me understand the working principle of mi 26 during the runway takeoff.

[@maximo4742]

Very well done.

[@kidszone6669]

Nice Video Brother...

[@rickb6881]

Very cool! Thank you so much for taking the time to do these videos. I have always been interested in rotary flight, it’s neat to have a resource to feed an interest. Subscribed😊

[@bobob427]

i think a simple drawing of the sprag clutch system, or cutaway ,would tell the story, and how the inertia is stored in the rotor head, would make people feel a little safer when flying

[@zubairahmed3280]

Amazing technology

[@davidwallace5738]

Great video sir. Thank you!

[@deedsmillar6056]

the easiest thing to compare it to that ppl would understand is you can pedal a bike and keep coasting after you stop pedalling. The belts are just a clutch in the simplest way.

[@philipkojohinson4089]

It makes a lot of sense, Thank u champ

[@TheBeingReal]

The clutch uses sprags as the wedging pieces to engage/disengage. Best overrunning cluch in the business made by Formsprag. 😁 I can get you oodles of info on that clutch. I used to design those and still work for the company.

[@step4560]

In my day with the R22 we always referred to it as a sprag clutch. I bow my head in reverance Sir...

[@moviestudioland]

Maybe post a URL to the pulley description?

[@TheBeingReal]

step4560 Sprag clutch is the term we use. Supply them all for all Robinson’s, Bell, MD, Boeing, Sikorsky Ch-53K, most all European makers too. Proud to be Flight Safety part supplier!

[@mrbmp09]

@@moviestudioland Similar www.mcmaster.com/4752n92

[@gibran53]

Used to work at Formsprag back in 2014. I believe these clutches would come out of their aeronautical/aerospace side and to meet much more stringent specifications?

[@markpieratt]

yes, i have a question - how much distance does a helicopter need and what are the free fall auto-rotation speeds (downward) ? and,! what happens if the aircraft is moving forward with speed, and the engine stops - how does auto-rotation work with momemtum? (or, how much trickier is it?) thank you for your videos!

[@sammyodame8801]

Informational, do you teach flight training on helicopters?

[@Ratlins9]

Thanks for the video and comprehensive explanation. Very interesting, will now become a subscriber.

[@EVELYNEMIL]

Little complicated, but overall is phenomenal.

[@robertsapsed3867]

Thanks Misha. Another great video. Also you should be selling these caps with your other merch. I'd buy one! Keep up the great work 👍👍

[@sodikhuntingchannel837]

Mantap ,, nyimak ajah dari indonesia ndinesia ,, joos tehnology

[@johnoregan40]

Freewheel, similar to Freewheel on a bike,ie....when you stop peddling the back drive wheel on the bike is still free to rotate in the forward direction. Simple...

[@mangratv4030]

thanks for sharing sharing this information

[@stumpjumper1dc]

Thanks much! Nice work. I enjoyed your video.

[@SmittySmithsonite]

Great explanation, Mischa. Before I became interested in aviation, I was one of those people who thought helis would fall out of the sky if the engine died. I didn't have a clue! Learning about all these systems on rotary wing, and the way fixed wing aircraft wings work, ended my fear of flying. Lots of Japanese v-twin motorcycles use a similar "one way clutch" or "sprag" system for the starter. On Yamahas, they're prone to failure, which usually destroys the starter, and requires a bit of labor to get in and change. I just did one a few weeks ago for a friend. Good thing Yamaha isn't making sprags for helicopters! :) Hope you do more videos like this, especially for the swash plate. 👍🍻

[@pieterpretorius1014]

rotax starters use the sprag system also if memory serves me right. i've help to strip a 912uls a couple years back, quite nice to see the inner working of those engines

[@SmittySmithsonite]

@@pieterpretorius1014 - Nice. I've done plenty of their 2-stroke snowmobile engines, but never an aircraft engine. The 2-strokes had this rotary disc "valve" system that was pretty ingenious. No need for reeds with that setup. It did have to be timed correctly to the crankshaft, however. Still an extremely simple, & reliable engine setup.

[@jimrogers907]

Not sure that I have ever disagreed with a comment from Pilot Yellow before, but I think there is a misstatement at about 20 seconds into this, saying that it is 180HP de-rated to 160HP, but as you go up in altitude, you use the full 180HP. I don't think this is true, as you go up in altitude, since it is a normally aspirated motor (nonturbo), the motor's ability to produce power decreases and as you get higher, at some altitude you will be using the full power of the motor, but only when it is no longer able to make more than 160HP. One advantage of a de-rated motor is that you are able to hold the de-rated power to a higher altitude.

[@jynnandtonnyx]

This hurts my brain ... why de-rate it in the first place? I am missing something here. Why take a 180 hp engine and limit it to 160 hp just to say you can go to the same altitude as a 180 hp engine. Honest confusion here, please no disrespect intended. Thanks :)

[@jimrogers907]

@@jynnandtonnyx The reason for de-rating an engine is to make it last longer between overhauls. If you were allowed to pull full power, things would wear out quicker because they would be under greater stress.

[@jynnandtonnyx]

Jim Rogers thank you !!

[@Novadean1]

@@jimrogers907 Yes Sir agree !

[@Novadean1]

I did not absolutly knewing there is a free on Auto to the G2 - Tailrotor ? I`m Bell 47 there is noon of free Tailrotor and it makes a Epic Autorotation Bell 47 I knew from my Rc helicopters too the free Tailrotor on Auto`s was making me a lot of crashes !

[@guzgilg]

Great stuff! Yes a fun one.

[@RomboutVersluijs]

Do you also have avideo on how the blades can turn while the axle is rotating. Im always kept wondering how it can adjust the blades while they rotate

[@RomboutVersluijs]

found it, as soon as i saw that double disc i understand it. Pretty clever kzbin.info/www/bejne/sGLQeJivjt-UpMU

[@YOUNABOTH]

Thanks, quite informative.

[@moviestudioland]

Very useful information. I was wondering how that decoupling would work. I figured you had to pull a lever or there was a switch. As long as the pulley does not jam up. I am thinking there is probably a max number of hours on this pulley and then it gets replaced with new. TheBeingReal seems to have the inside track. Wondering on how many HOURS this pulley can work before it needs attention? Truly a life saving device.

[@CriticalInception]

Fascinating stuff bro. I'd love to see a breakdown of the tail rotor sometime. The mechanical engineering of these aircrafts blow my mind.

[@Afrocanuk]

The "freewheel unit" is also refered to as a one-way clutch.

[@cardboardrob1]

That's awesome how they work

[@MickB235]

The analogy I would liken the freewheeling unit to , would be the sprocket cluster on the rear wheel of a bicycle as it's a practically exact duplicate in the method of operation

[@Novadean1]

I as well got this System with the Tailrotor free drive on my Rc helicopter !

[@ayoonakunle3113]

Can you give us a demonstration of the Auto rotation while engine is switched off in mid air. Thanks

[@hotrodray6802]

The blades pitch downward and glide just like an airplane wing does. Instead of maintaining your airspeed, helicopters must maintain the rotor rpm. Blades are flying wings going in a circle

[@shaf3006]

the gear that engaged and disengage with the rotor seems similar found in a moped motorcycle and portable grass cutter, I don't know what it call but seems similar

[@johnbrookes2196]

Thanks for this video. With all the complexity of the drive units, gearboxes etc isnt this what makes helicopters give that perception of being dangerous to some people. With aircraft its more straight forward. Dont get me wrong I love helis but not sure I would want to travel much in one.

[@jamesa.musicproductionsand497]

Great video man I always wanted to fly one.

[@hansparam]

Nice but you should have used graphics for better impact.

[@TheGeorgiaRover]

Uh, huh-huh-huh. He said “shaft”. Huh-huh. 🤘🏻😎🤘🏻

[@georgefranklin8654]

Excellent !

[@USER-jo7yz]

For how long the flywheel (i.e. the helicopter blades) can still rotate and keep enough lifting power?

[@abengineering9954]

Ok ready to test drive..

[@stephen5147]

Good video. The visual of the parts might be better demonstrated with all the panels removed, such as during maintenance. The video began w/ a shot of the swash plate... I thought that's what you'd be talking about.

[@ivanbratanov8699]

That free wheel is something like the bendix drive in the car starter motor. Same work principle, same purpose.

[@zuestoots5176]

Its called a roller clutch or one way bearing

[@rillpoogue8838]

Hey so since the clutch actuator pushes the upper pulley and tensions the belt, does this mean that the drivetrain is actually moved upwards too? (Including the flex plates?) Seems pretty non-rigid...

[@Arne279]

Great vid, very informative......

[@MichielBetel]

Why the background music? I find it extremely distracting!

[@rksg2003]

I would rather hear the traffic in the background myself

[@saeydavid]

I don't mind it either..

[@wilson4328]

It's just what vegans do, relax and enjoy.

[@Novadean1]

@@rksg2003 There is no music ! What is wrong with you boddy ?

[@staytogether27]

Great video, one question about the helicopter's engine start-up! I saw few times when you started the engine it went thru a few steps, if the Cabri G2 engine is a regular 4 cylinder flat engine then it should start just like a regular car engine, with a twisting a switch or pushing a button it should start quickly without any other process! I can't understand the concept so please if there is a chance then explain a little! thank you very much for your amazing videos, I am not a pilot but I hope one day soon I will have a chance to fly with you.

[@daveslick3969]

Thank you. Keep it up

[@jailalrai7768]

Pl explain in details the helicopter drive mechanism with schematic diagram

[@blacklion3295]

How the rotor motion is brought up to the main rotor from the engine ?? 🤔🤔 through a shaft which is going through the swash plate or something ??

[@LCMNUNES1962]

VERY GOOD MECHANISM, FRON BRASIL.

[@bigpeter2767]

How close is it mechanically is it to the free wheel hub of a bicycle? In a bicycle you have slots that are angled.and ball bearings with enough space to evacuate into the outer hub n the free wheel direction that are forced forward into reliefs in the inner hub to drive.

[@sherwinsalvatori6997]

The freewheeling system is the same principle as a bicycle back wheel.

[@zozuplink]

I’d like to understand if a helicopter has a starter motor similar to a car (where the starter motor shaft engages a gear attached on a flywheel but then retracts after a successful start) . I’m particularly interested in the case of a turbo shaft engine. There are plenty of videos showing the procedure to follow sitting in the pilot’s seat, butI can’t seem to find any video addressing what is going on back in the engine compartment. Thanks.

[@PilotYellow]

zozuplink yes the starter work the same way with the bendix shooting out and engaging the ring gear when you hit the starter.

[@zozuplink]

Pilot Yellow Aha! Cool, thanks for the info.

[@Calvin-xp4qp]

How many degrees of total collective pitch does that helicopter allow? Fun vids, thanks!

[@alexwonner7469]

wil be nice to have a practical demo on a a dismanteld engine...

[@stachowi]

Amazing video! Why do you get more horsepower (180hp) when you go higher up?

[@jbodenr7836]

I wondered the same thing. Certainly you don't get more HP at higher density altitude with the same power setting, actually the opposite is true. But engines which are de-rated by having lower limits (red lines) placed on RPM or manifold pressure may have these limits changed at higher altitude. This will be perfectly fine because the engine does not produce the same power at this altitude (less air -> less fuel -> less power).

[@salemmhel3355]

Amazing..... Old. Teach me

[@jpd4376]

Saw you guys flying the G2's in abbotsford last week and this week when I was out there. Quick question but who flies that gorgeous old-school looking white helicopter out of abbotsford? Not sure what it was but looked like an old-school Bell? Keep up the great work with your content! Too bad I wasn't in town when you were giving strangers free helicopter rides ;)

[@jeepcj7dude]

Was it a bell 47? Chinook in Abbotsford used to have one. Hope this helps!

[@jpd4376]

@@jeepcj7dude definitely what it looked like, beautiful bird! The G2s are very pretty as well seeing them flying in person!

[@tomgrimes8379]

Why is there a trumpet solo underneath the presentation about the helicopter transmission system? Why not cut the music? What bad thing would happen?

[@randypennel3731]

With a Jet Turbine Helicopter what's that high pitch almost like a squealing sound before the main rotor starts to turn and then that popping sound instantly following the rotor beginning to turn?

[@johnhabeck6153]

Could the rotor blades exceed normal rpm during autorotation ?

[@Tokyoz_sky_]

This is old model helicopter system?

[@christophersamuels2107]

I want build an ultra light helicopter, where and how can i access books, engines, spare parts etc?

[@Sameer2762]

Awesome explanation 👍🏻👍🏻 will subscribe you after my stuff comes up after this pandemic ends and I get the parts, done the rest bro, stay safe 👍🏻👍🏻

[@ifeanyichukwuoluchukwu5786]

How does each Turn of the Blade affect the Movement of the Helicopter?