30 pages in my ATPL book or simply a couple of minutes watching with perfect visualizations to memorize it a hundred times better. Thank you for your effort. I‘d love to see more ATPL related!

Thank you for the simplicity! Now I can read my maintenance engineering textbook with the basic understanding that it assumes I already have.

Hands DOWN the best explanation I’ve found! Brilliant!

This is "The Best" explanation of CSU and variable pitch propeller ❤️

Thats amazing! you cant even imagine how much we appreciate to these efforts made to make this video happen!

This is the best Constant Speed Propeller explanation on internet. Congratulations

that visualisation is as brilliant as the mechanics it shows. Thank you very much for your awesome videos. I learn a lot from you.

Fabulous video. One can really picture how the whole system works in a way that makes perfect sense.

no other explanation, is as concise and precise as these flight-club animations. So well scripted, edited and animated. I refer to all of them for my PPL

As has been said by others in these comments. This is the best explanation with video explaining the CSP on the Internet!

One of the best explanations I’ve ever seen! Great job and thank you for the effort!!

The best explanation on the internet regarding Constant Speed Propellers. You Sir are amazing.

Really good. Just one thing, on the DA42 all is opposite. To achieve high pitch and low RPM oil should flow from the propeller to the oil tank and vice versa.

Thank you so much for your video,this is absolutely the best the video about the propeller pitch control and CSU! Your beneficence is boundless!

What a brilliant video, covering each and every relevant detail. Fantastic.

Studying for my ATPL and this was very straight to the point and well explained. Thank you!

These explanations are so precise, concise, and well put together. Thank you for your hard work.

studying this for my oral test over constant speed propellers ! thanks 🙏

Thank you very much. I appreciate your videos so much and am so happy you are making them again. I'm from Australia and about to sit my PPL exam. I read the two main authors I Australia for this topic and couldn't only sort of get my head around it. Your video, excellent!

It is a perfect video and you speak very clear, thank you.

Great to see you back. Be more frequent please 👍

That was both interesting and informative. Thanks!

All your videos are of superb quality.. Thanks a lot for the effort put in making this, it's greatly appreciated

Thankyou so much for such a great and amazing ever seen animation !!

Came looking for the kind used in power systems on commercial planes, had no clue this existed. Thank you for this content.

Amazing explanation, can't be better than this!

Ah that's how they work. Very well explained. I think James Clerk-Maxwell wrote something on this subject a while ago. Kudos for the like and to those who know who James Clerk-Maxwell was. For others he wrote a paper "On governers" in 1868. It gave the mathematics behind designing governors as used with Watt's steam engine. The first paper on control. He also combined electricity and magnetism to show them as being one. Later another physicist stood on his shoulders who is today sadly much better known than Clerk-Maxwell.

I'm so glad I found this on my recommended videos page! Thank you!!

Great Explanation and visuals. I watched 3 other videos on the same subject and found them rambling and disorganised, with no proper visuals. This was perfect!

Lot of thanks. Very nicely explained. Huge appreciations!

Thanks so much! This is a wonderful explanation!

Best explanation around. Thank you!

Thank you for this video. So easy to learn and understand!

Your videos are such clear and elegant things. Please keep up the excellent work.

I’m glad I watched this before my CPL flight test!

This is amazing and very clear! Thank you! :)

This is beautifully explained! Thank you

Very nice and interesting visualization. Thanks for sharing this. It helps me a lot to understand this control system.

Super useful knowledge! Thanks!!

This was truly amazing

Great video, found this explanation very helpful!

This video was 👌🏻💯+10

All the serie of those videos are very very good and simple to understand. I also want to tell that this women has a beautiful and clear diction and a very cute accent.

awesome explanation. best on WWW. thank you!

Simply perfect.

Thanks for the video! You got a new subscriber. However, a couple of suggestions: at the beginning of video when showing fine and coarse pitch I would add "feathered" position. Secondly, when climbing/descending, the order of using throttle lever, eg. when Climbing (adding power): Pitch first, Throttle second; when Descending (reducing power): Throttle first, Pitch second. Cheers

Stunning video! thanks

Thank you for this

Fabulous explanation . Thank you so much.😀

I'm tired to keep trying understand this system in my books still complicated but know I'm so satisfied with your explication it's very helpful thank you so much

Brilliant video

Awesome video! Great visuals.

Greetings from Phoenix, Arizona. About to start working on a "complex" endorsement - that is what we call it in the states anyway. Thank you very much for this presentation, it is clear and concise! I wish more explanation videos were this good. Peace.

Brilliant!

Keep in mind the direction of actuation is often different be single engine and multi engine aircraft. Generally... Multi engine aircraft will move into a feathered position when there is no engine oil pressure and single engine aircraft will move to max fine.

Thanks!

This video was very very useful👍

Excellent animation!

This is only correct for single acting non-counterweighted propellers. The Governor is not always directly driven by the crankshaft, many are driven from the accessory drive, or even the from the gun synchronizer drive, i.e. P&W 985 for one.

Thanks

great explanation, cheers. As you said the pilot increase the RPM but the plane pitched up, the governor would automatically adjust the blade angle to compensate the RPM?

napaka lupit

I'm wondering if this only applies to McCauley because Hartzell oil pressure does the fine pitch part?

Good video. For pitch up condition, torque should be high. Kindly correct me.

What happens with blade angle when we add power in cruise with constant speed prop? Does blade angle also increase?

Be careful this is for single-engine aircraft. With oil pressure lowering the RPM, and nitrogen gas/spring send the PRM towards the high. So in the case of losing oil pressure, the propeller will work at full fine position. In multi-engine, it is completely opposite, oil pressure increases the RPM(fine), nitrogen gas/spring decreases the RPM(Coarse/feather). So in case of engine failure in a multi-engine aircraft, the pilot can feather the bad engine to decrease drag.

This is a great animation, except one thing that make me confused. For PA44-180, when aircraft overspeed, oil leaves the prob hub and make pitch angle increases and vice versa. This is seems opposite animation in this video. Is there the general concept for all aircraft's CSU, or it differ aircraft by aircraft. Btw, that a great animation.

What does CSUB stand for?

The animation would be for a non counterweighted prop as the animation showed the engine oil flowing into the prop and increasing to a more course position

so how does the oil pressure get into the propeller hub when all that stuff is spinning?

Blade angle is referred to as low pitch or high pitch, not coarse/fine.

Hi could you please explain at the beginning of the video (1:30) it says as engine RPM increases(small blade angle) the fly weights move OUTWARDS and as the engine RPM decreases(large blade ) the flyweight move INWARDS , later on in the videos(3:45) it says as to maintain the high RPM (small blade angle) the flyweights now move INWARDS and to maintain a low RPM the flyweights now move OUTWARDS, which is contradicting what was said in the beginning of the video. Could you kindly provide some clarity? Thanks

Why is the propeller backwards. Spins clockwise as seen from the front.

Is the yellow part the nitrogen?

why is it that in a free turbine when the plane shuts down (less RPM) the prop feathers (pitch increases)? wouldn`t the oil lines have to be swapped and the propeller adjust pitch the other way around?

Sounds like this is for a naturally unfeathered prop where oil pressure increases blade angle (coarser), whereas other videos show a naturally feathered prop where oil pressure decreases blade angle (finer).

The engine can also have a governor that maintains engine RPM at the desired throttle setting.

Thanks a lot for the great work but if I may, I think the explanation is fundamentally misleading by confusing variable pitch propellers and constant speed ones. It is true that CSU achieve their goal by varying blade angle but the goal of a CSU is first and foremost to keep the engine running at a fairly constant RPM (like a gearbox) , the aerodynamically phenomena on the propeller being the mean rather than the end goal. So saying that CSU are the answer to fixed pitch propellers not having an optimal AoA in most phases of flight isn't correct: variable pitch propellers without a CSU do exist and are a solution to that problem. The philosophy behind CSU has more to do with engine power and efficiency. It is indeed a complex topic and comments and suggestions are welcome.

clockwise spin or anti-clockwise?

Isn’t this something that could be used in human sized quadcopter? How energy efficient is it?

i think the oil pump tend the porpeller to decrease the pitch angle not to increase't

Why all of this governer thing if the PIC can just control the flow of the oil from the pilot valve instead?

Wait... Right off the bat I dont understand why in the fixed pitch example, a change in airspeed would change prop AOA. I'm now deep down the rabbit whole. Send Help.

So stick shift for planes :p

F to the guy who came up with that idea lol

can I get a pin ?

If the airplane ascending it must increase speed to prevent stall so the blades must be increase angle to take a huge bite of air so the engine must increase the torque.. and opposite is right descending .. not as you mention in video!