How ducting a propeller increases efficiency Personal electric flying "sports 2 days ago   18:18

RCModelReviews
By placing a propeller in a duct, the efficiency and maximum thrust can be increased, sometimes significantly. This video explains two of the mechanisms by which these improvements are obtained -- namely by reducing the losses due to the tip vortex which occurs when a propeller operates in free space and also by using an annular wing that harnesses the effects documented in Bernoulli's theorum.

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45445 Angels
Explains why in the Avatar movie, humans uses these type of rotors on their helis at pandora cause the atmosphere is thinner.
antsolja
so why are ducted fans so rare in aircraft outside of turbojet engines?
antsolja
all it does is eliminate wingtip vortices?
i thought that answer would be way too obvious and that the effect would be too insignificant.
also couldnt you just achieve the same effect with winglets on the tips of the propeller blades like sailplanes and airliners use on their wings?
Jason Lopez
Was the follow up video ever made? I didn't see it but I was hoping I may have missed it.
Anand Tewani
Someone should pick such people off the internet and just treasure them in one big reputed university.
you won't require any sorts of ppt or high graphics 3d animation just to teach the students, rather only by this simple method of teaching, you would get some exceptionally highly skilled people on this planet Earth.
Manolis Hiotis
What a great tutorial on Bernoulli and airflow.
Benjamin Ramsey
So why don't all performance quads have these? They must not actually work that well in the real world, or maybe just not so well on the small scale that quads operate on.
Al Burmaster
Ok I like it! something for nothing, but do you have any testing showing the amount of gain?
Octav Stanculescu
As a european I am perplexed by the persistence of the americans and their idiotic explanation for lift. According to part of your explanation, any car that has the air traveling faster above than below should take off. The reason for the teardrop shape in planes is that they need to have a massive beam in the middle of their wings for support. Air has to be somehow channeled around that and the teardrop shape adds the least drag and minimizes turbulence. Otherwise... A papper thin wing would be just as good or better.
Jaystarz2000 gaming
Here is a link that I copied into this comment section https://en.m.wikipedia.org/wiki/Newton%27s_laws_of_motion. Thrust is a push or a pull effect on everything Gravity pulls you down when wings create lift and drag is an opposite reaction of thrust or a momentum. This is my simple example of every action there is an reaction. You should try Stormworks it is a game that you can build this stuff from scratch.
Justin O'Briant
Informative and easy to assimilate - very much enjoyed the tutorial and plan to use the data in development of my drone flying device--
Tony Lam
Can you give a ball park figure what kind of efficiency gain there will be for a duct verses a propeller, assuming we use the same Hp input, how much thrust from each, %? Why is it the Cessna 172 , C130 Hercules do not use ducted fans? Is tip speed still a problem with ducted fans, have to be below mach one?
David James
I thought ducks, seagulls, and birds in general were bad for planes.
David James
As this guy gets more and more excited about what he is talking about, he talks faster.
hoofed
You’re not getting that extra lift for free because you’re adding mass. It might be an efficient trade off, especially when you’re smart about materials and how you construct the ducts, but it isn’t free.
The Drone Horseman
Why isn’t this concept used on paramomotors?
Alan Rogers
Great job, but too many "hints" to other programs. What was the failed US experiment from 55 or so years ago? As they say, "inquiring minds want to know".
Idontneednostinkingchannel
Why not spin the whole embodiment.. creating a new propeller design? In other words, build the duct onto the prop.. and spin the whole thing..
R Deegan
A massive dopamine hit !
Berzerker God
1:10 😂😂😂😂😂😂😂
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