Most Advanced eVTOL Propulsion System: Adaptive Ducted Fan

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2 жыл бұрын

80% of the current most advanced eVTOL projects are using well-known open propellers as the main propulsion system. This simple and straightforward approach allows manufacturers to quickly progress in the development of an eVTOL aircraft to make it marketable. This is a great strategy from a business perspective. In the future, however, these companies could be facing real market application issues related to payload, safety, noise, and scalability. In this video, I will analyze the main advantages of ducted fans over unducted propellers, and I will explore a new and advanced eVTOL propulsion system that offers extra thrust during hover, reduced aerodynamic drag, 40% greater efficiency, and has the ability to assist the aircraft in the transition from hover to cruise flight.
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@eVTOLinnovation 2 жыл бұрын

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@aarona5522 2 жыл бұрын

Did someone say advanced??? hmmm i dont think so. Viktor Schauberger.

@pietskiet8763 Жыл бұрын

Do you plan to recharge on descent?land spot on like Musk boosters..can limit the extra batt charge for looking for alternative airport and weather limitations all in one ?

@user-gq9qh2kw6h 11 ай бұрын

... Looks like an scam

@xevious2501 11 ай бұрын

Novel idea, seems cool but many many more moving parts which means many more places of possible failure. Not to mention additional complexity in part creation and manufacturing. still its a novel idea. Ive never been a fan (no pun intended) of open rotor designs. The Lilium Jet for me is still by far the leading design in this category of aircraft. Safety for me is the primary issue. Many many open rotor blades all moving at high speeds and a very high risk of cataclysmic failure and extreme safety risk for passengers in the event of an accident. And we should all expect an accident event with each aircraft. be it bird strike, or some other unforeseen event that would otherwise see rotor contact with a foreign object. Ducted fans vastly reduce such risk, as a serious engine failure would physically be contained within the duct.

@AllanRosd 2 жыл бұрын

Impressive I've been designing mechanical parts for more than 10 years now for drones, seeing this is like a dream. Good times to be alive

@edwarddejong8025 2 жыл бұрын

This type of approach will depend very much on the mechanical engineering skill of the fabricators. To keep the weight down, and the number of moving parts minimized, will be a huge challenge. The noise issue is critical for electric aircraft to succeed in the cities. At present for example, helicopters are banned from the bay area; you have to land near the airport, as the noise was just too much. In Brasil, Sao Paulo, has the largest helicopter fleet on the planet, because they don't have noise restrictions. So ducting may be necessary, even though it costs weight, because noise pollution from a lot of these things buzzing around will be quite annoying.

@swisstraeng 2 жыл бұрын

There is another issue also. With 4 fans, should an engine fail in hover flight, there is no way to avoid crash. A helicopter can still land should it lose power. Same goes for aircrafts. That will likely mean 6 fans minimum are needed, and tripled up electrical systems, and make sure the aircraft still flies with 4/6 fans.

@edwarddejong8025 2 жыл бұрын

@@swisstraeng i think the electric helicopters are going to need ballistic parachutes, as i don't think triple redundancy is cost effective.

@nibblernibbles3205 2 жыл бұрын

Another better to the noise problem, is just not to have them in the first place.

@billyswong Жыл бұрын

@@swisstraeng The adaptive ducted fan seems to be designed for winged aeroplanes that can also take off or land vertically. To avoid crash, the solution seems more about making the planes glide-friendly, not adding extra fans.

@MilitaryMatters1 Жыл бұрын

It's easily done. Lockheed Martin has Boyd B. Bushman to thank for this brilliant invention. It works like a fuggin' charm.

@Elrog3 2 жыл бұрын

Its a nice idea, but those quoted efficiency gains seem unrealistically high. And battery tech is still going to have to get a lot better first.

@EdwardChew 2 жыл бұрын

agree

@badsamaritan8223 Жыл бұрын

Battery capacity just doubled. Amprius is taking their battery to production. Over 500wh/kg, while Tesla's is 300-something.

@Elrog3 Жыл бұрын

@@badsamaritan8223 I'll believe its tranformative when I see it. What's the cost? How much are they able to produce? What is the expected cycle life?

@shauljonah6955 2 жыл бұрын

I have liked vtol for a long time and now improved again . Amazing 👏 thanks for sharing.

@paitenkersuresh5985 2 жыл бұрын

This is one i am weighting for very long time. Its amazing analysis. Keep it up

@jayknight139 2 жыл бұрын

Wow this at least seems like a decent step forward in tech for this field

@ThatBoomerDude56 2 жыл бұрын

Doubtful.

@kenrobba5831 2 жыл бұрын

I liked the “take” having experimented with models, liked all the considerations taken into account.

@L33tSkE3t 6 ай бұрын

This is a really novel and innovative way of problem solving for the efficiency loss from un-ducted fans while greatly mitigating some of the issues when utilizing ducted fans.

@nelsonneves5880 Жыл бұрын

A small twin electric ducted fan jetpack with this system would be an interesting toy

@jedimastersterling1 2 жыл бұрын

That sound like a really clever solution to a really dumb problem. Private helicopters are not a big market, electrifying them won't change that, and no one uses helicopters for bulk goods transport, there's a reason container ships and trains carry hundreds to thousands of containers at a time and not just one.

@davidficca8963 2 жыл бұрын

I think the idea was to use them as cranes to move containers but why do that when you could use trucks

@ThatBoomerDude56 2 жыл бұрын

@@davidficca8963 Right. Ground based cranes and trucks are an order of magnitude more efficient without having to use air to thrust them into the sky.

@blakelowrey9620 2 жыл бұрын

@@ThatBoomerDude56 if you could eliminate most of the massive costs, noise, and maintenance of a helicopter I'd imagine it would be a lot more common in the civilian sphere

@ThatBoomerDude56 2 жыл бұрын

@@blakelowrey9620 Yes. It would be "more common." But still not extremely common because it helicopters are massively inefficient compared to ordinary airplanes. And the necessarily smaller blades on a set of ducted fans makes it horribly less efficient.

@blakelowrey9620 2 жыл бұрын

@@ThatBoomerDude56 sometimes utility is more important than efficiency is what I mean. I don't think it would ever replace ground based infrastructure but for emergency vehicles and fast private transportation for the wealthy, I think it makes a lot of sense. Basically you are just getting a little helicopter that is safer for bystander and can be operated with a less extreme maintenance cycle, nothing more. It would be restricted in range and flight time but I don't think that's a huge issue for a system limited to an urban metropolitan area.

@Aloha_XERO 2 жыл бұрын

I learned a lot and gained inspiration from the video

@clarencehopkins7832 2 жыл бұрын

Excellent stuff bro

@aafjeyakubu5124 Жыл бұрын

Increasing complexity is rarely a path to improving reliability. Would love to see these things come to market, but I'm still not convinced they are a solution to an existing problem, or a solution in search of a problem.

@eduardomalveiropereiraleit4705 2 жыл бұрын

Thank you. It Learned a lot!

@ObjectivePersonality 2 жыл бұрын

Wow! That is NOT a small improvement.

@ThatBoomerDude56 2 жыл бұрын

It's probably a *very small* improvement -- if any improvement at all.

@patrick1532 2 жыл бұрын

"The team began development back in 2019" *Black and white photos*

@nickkacures2304 2 жыл бұрын

Awesome! and informative as usual thanks. Could you think about doing a show that would look at timeline for adoption of eVTOL you know make predictions. I really like the work that Tony Seba has done personally and at Rethink X on wind,solar,batteries and electric vehicles.he made predictions that have mostly come to be and earlier than he thought. You could start with. Battery density for eVTOL Battery type and chemistry Structural batteries? Possible Future Passenger carrying capacity possibilities Distance of use limitations Personal use possibilities I guess I just would love to see an hour plus Long presentation of where we were where we are and where we are going . Hopefully not to big of an ask .

@fonwoolridge 2 жыл бұрын

Very very interesting! Thanks...I think you /they are really on to something here.... This is totally the way of the future.... Now.... if this was just combined with a WIG/WISE craft..... 🙂

@federicosagun4615 2 жыл бұрын

Well done.

@balananatol1599 2 жыл бұрын

Xagon Solutions👍

@kirtandreamrezzer Жыл бұрын

Mad scientists at work here! 🌟🌟🌟🌟🌟

@saminsiddiquee2059 Жыл бұрын

Good Job to the company

@regularguy8110 2 жыл бұрын

Xagon Solutions should collaborate with Thingap, Inc. The result would be Awesome!

@f1reguy587 Жыл бұрын

Ive looked into this over the years, the idea of the ducted fan particularly for private use wont work out untill the military adopt the R+D costs, you run higher more efficient RPM in the ducted but you lack the lift potential since you require a pretty large ducted fan, this is mostly noticed when you want to lift weight and of course deal with wind, gyros have come a long way and polymers have also, which makes these machines very much more possible, but its just not taking off as a venture until the powerplant requirement and versatility for one of these exists. The operating costs even of a basic helicopter would dwarf this concept, even if it is better in some ways.

@KevinATJumpWorks Жыл бұрын

It surely makes sense for more classical, hover-dependent vehicles like the typical 'drone' without any wing-surfaces. However when it comes to winged aircraft, I am not convinced that these efficiency gains in hover will outweigh the high loading that comes with them. This means longer transition times and therefore more time in hover.

@theothergameygamer 6 ай бұрын

Kudo's to the narrator's ability to say "Adaptive Ducted Fan Propulsion System" often and with clarity!

@markhuebner7580 10 ай бұрын

Awesome! Now if I can just find a way to put the adaptive structure on the rim of a motorcycle wheel we might have a breakthrough commuter vehicle!

@trionghost 11 ай бұрын

It works only in underload conditions 'cause in full load condition you will end up with balance T=

@Nam.Priyaphon Жыл бұрын

Interesting

@L33tSkE3t 6 ай бұрын

Idk how much sense the Cargo Container/ Freight version of the E-VTOL craft would make but, I think it could be very easily adapted to make a really sophisticated type of Emergency Aircraft that can hold swappable pods, like it would containers. Able to hold various mission specific payloads, such as a medical pod that can not only serve as an Emergency medical transport helicopter capable of handling both transport and triage of multiple people simultaneously but, also as a full sized ER room that can drop off fully equipped medical facility pods to remote areas or a battlefield. Possibly even a firefighting VTOL that can hold more water than a helicopter equipped with a Bambi bucket and potentially operate remotely or autonomously.

@michaelginever732 Жыл бұрын

See the Lillium prototype. Looks good.

@ralphkilcup566 Жыл бұрын

It's appears the new Electric Induction Fan Jet Propulsion has advanced significantly to overtake the Prop Engine but not completely replace the Prop Propulsion. I like the performance specs comparison. The real tests for this type of engine propulsion would be Operation in extreme conditions where moisture, humidity, or extreme heat and extreme cold could significantly impact Flight Performance, Range, and lift capacity.

@pubfixture 2 жыл бұрын

I LOL'd at the end where they had a "Heavy" lift vtol and were going to "disrupt" the cargo offloading sector!

@115_vaibhavidangre4 Жыл бұрын

same🤣

@KenImduaikiat 2 жыл бұрын

Well described concept. Wish there are some scientific numbers to support

@Dude_Slick Жыл бұрын

I hear ya. I can make CG models and animations too. lets see the numbers. build a prototype vehicle and fly it.

@eliwolf4172 2 жыл бұрын

Thanks

@md.moinulislam9467 2 жыл бұрын

MASHAALLAH khub valo video......

@paulrandig 8 ай бұрын

The term "retracted adaptive ducted fan" several times in a sentence is hard work for the ears.

@Yay-hovah 2 жыл бұрын

How well does a ducted fan work while landing and taking off in gusty conditions?

@mohammedalhouli7315 Жыл бұрын

The design is very human..very easy to use

@powerofdreamx 2 жыл бұрын

Performance was shared at 400kw? What is performance at 50kw? Example, 4 50kw units for a quad... is this efficiency only seen at high power as the curves looked to narrow to the left.

@minerran Жыл бұрын

What about using toroidal propellers? Early research data from MIT suggests these might be even quieter and more efficient than ducted fan technologies. Marine toroidal props are already being sold. I believe this is the future, even better than ducted.

@mikegLXIVMM 2 жыл бұрын

Will this work for small drones?

@grummanfanschneid Жыл бұрын

I’d luv to see this come to mkt for the public - my father worked for Grumman Aerospace - Grumman was always looking to advance both air/space travel - I’d buy 1 so sign me up - 2 people plus luggage

@Johny40Se7en 9 ай бұрын

Wicked stuff. Reminds me of the Ciphers on Metal Gear Solid. Also, do not take a shot everytime "adaptive ducted fan" is mentioned, or you won't be going to the ER to have your stomach pumped, you'll be going straight to the morgue. Bloody hell 😅😆😛

@user-jc2we4sn1i 7 ай бұрын

nice

@user9b2 2 жыл бұрын

Instead of expanding the front, why not retract the exhaust? Or both - to reduce the movement requirements - could be easier to manage ? Think stargate Iris, rotate to make smaller or larger openings 😎

@shan5445 10 ай бұрын

So with the width where are people keeping these veli's when they are on the ground. On the street or on your front drive?

@sinexityyy 2 жыл бұрын

Whats next carbon-sleeved motor like the tesla plaid curious if they could have a huge play in ev flight probably not but maybe in the future but that could be very tricky thing to design and make the machines to make it

@Renjie_K 11 ай бұрын

Not gonna lie i cant wait for the day someone decides to do something crazy like building something on the scale of the Dragon Assault Ship from james cameron's avatar. Obviously the proportions would be different but it would be amazing to see airbuses like this for regional transport.

@Macrocompassion 11 ай бұрын

A full comparison between ducted fans and propellers has not been presented. The effect of propellers having lower mass means that they can be made of greater disk diameter with lower induced speed of the air at the blade (as in a helicopter rotor) and the result is less noise and greater lift or thrust. But these two answers are not the only possibilities, and it is my claim that the energy being wasted in the flow of the air behind or below both arrangements can be reduced using a centrifugal fan that works below a canopy (like on a parachute). The radial flow from this kind of fan is then blown onto the curved surface of the canopy and is directed downwards, being curved below it. This spreading and curvature of the radial flow, helps the kinetic energy to be converted into pressure energy and lifting force on the canopy itself. There will also be some suction above the inlet to the fan which will also add to the effects that the canopy provides. It is also advantageous against engine failure where the sinking speed is reduced as on a parachute, and unlike anything like as much as on an auto-rotating helicopter or drone.

@skenzyme81 2 жыл бұрын

Getting the weight down at an affordable price will be a real trick. Lot's of unique carbon composite components with high-precision tolerances will be EXPENSIVE.

@SmoochyRoo 11 ай бұрын

Nah, another much simpler solution is to just make the ducted fans slightly larger to achieve the same efficiency and airflow goals, the increase in weight due to the increase in size would be less negligible than the weight introduced by all those mechanical parts, the overall size increase won't change the aircraft profile and footprint at all as well, and adding a few more blades to the ducted fan would also go a long way to reducing noise and helping with lift.

@p4inmaker 2 жыл бұрын

Cool idea, not sure if the increase in complexity is worth it.

@ThatBoomerDude56 2 жыл бұрын

Probably not.

@estoupaa 2 жыл бұрын

Why they don't make it hybrid? Eletric take off and landing. Gas powered cruize mode. It could fly for much longer time than using bateries.

@SMunro 11 ай бұрын

I suggest a rotating cylinder using magnus effect for lift on each rotor arm. No blades, just the cylinder on the arm extending from the craft.

@markchapman3457 11 ай бұрын

It would be interesting to see how adaptive ducted fan would work with toroidal propellers

@FunnyHaHa420 11 ай бұрын

I was thinking the same.

@mrsuper7484 8 ай бұрын

Wouldn’t really work as the purpose of the torroid is reduce turbulence at the tips or what would be a standard propeller. A duct does the same thing by being a physical barrier to reduce wingtip turbulence.

@juraji0 Жыл бұрын

Never made sense to me, how is the ducted fan more efficient and simultaneously needs more power to hover ... am I wrong to think that a higher efficiency system would need less energy for a given amount of thrust ?

@powerbuoy 2 жыл бұрын

What was the name of that fan again?

@Cavewars 2 жыл бұрын

EVTOL vehicles are the future

@tklearning4428 2 жыл бұрын

Ikr ✨

@LanaaAmor 2 жыл бұрын

nope

@forloop7713 2 жыл бұрын

Aka helicopter

@Vinzmannn 2 жыл бұрын

If battery technology improves, yes

@jshand8557 2 жыл бұрын

Not unless you are a billionaire.

@JinKee 2 жыл бұрын

hexagons are the bestagons

@tsclly2377 11 ай бұрын

Forget the stators, as it is better to use a counter rotating independently driven lower set of propellers as to redundancy of having power and it is better to have a simpler airflow limiting / compressing design by having a bigger center that goes in and out than to increase the ring with a complex clunky multi faceted expanding cone.. it is the high speed that one wants to decrease the air flow into the fan as this is where power requirements start getting exceedingly high as speed increases.. and at the higher altitudes increasing the pressure inside the duct keeps the fan more optimized.. I've done the math years ago and solidity is what you want with fans as you can get realistically a 12% increase in efficiency, everything else takes more power as one is accelerating a mass of air to higher velocities... so the start of any exercise in this is the force that you engine(s) or motor(s) can deliver.. there is no 'free lunch'.

@foadrightnow5725 2 жыл бұрын

Why don't they incorporate micro gas turbines to assist in VTOL? Even if just a couple of them.

@victordiazcaballero9349 2 жыл бұрын

I don't really understand the disadvantage of the consumption of more power for hover in ducted fans. If I am not wrong, ducted fans needs less power to hover than open rotors, since the losses produced by tip vortex are avoided

@eVTOLinnovation 2 жыл бұрын

In general the disk load is greater in Ducted fans. Ducting a large propeller is difficult

@lailaahmed3650 2 жыл бұрын

I also Design a vtol craft with this like technology

@nojukuramu 2 жыл бұрын

imagine multiple evtol flying in to your city as Police Patrol constantly observing the streets.

@odeltarkhan3033 2 жыл бұрын

What is the price please?

@Txepetxcc Жыл бұрын

So why exactly would one want to retract the ducted fan if it works better expanded ?

@newpapyrus 10 ай бұрын

Using a reformed methanol fuel cell/battery, ducted fan aircraft could have access to substantially more power and range.

@C-o-r-y Жыл бұрын

Create John Searl effect generator for vehicles so we don’t ever have to charge again. Ducted Searl effect fan generators.

@andrzejmatwijenko7311 11 ай бұрын

6:50 the private drones in the city have more or less realistic vision but transporting a container maybe only empty because fully loaded is weighing more than 20 tons plus batteries for drones so it's just inefficient and traditional forklifts also can be electric and they're just safer to use so it's just a bat idea to use drones for containers.

@lordserj1801 11 ай бұрын

Airspeeder flying car & Jaguar Gen 3 . A new era, electric cars, flying cars, technologies that we should not stop at, let it always burn, only the green light ...

@MasterIvo Жыл бұрын

Instead of a propellor, I would love to see the development of an impellor motor, based on creating a vacuum where the air can flow into, with the mayor benefit of creating a (natural) vortex instead of turbulence.

@Dude_Slick Жыл бұрын

"I would love to see the development of a impeller motor, based on creating a vacuum " Well then roll up your sleeves and get to work.

@MasterIvo Жыл бұрын

@@Dude_Slick my comment was removed...

@Dude_Slick Жыл бұрын

@@MasterIvo what comment?

@nickoutram6939 9 ай бұрын

The new Gen4 eVTOL racers have a bi-engine ducted fan arrangement (and a 1MW hydrogen powered generator). Their ducts are optimised for speed though, not adaptive.

@gryn_ghoul 2 жыл бұрын

Ducted eVTOL transportation for civilian movement is cool. The application for transportation and movement of shipping containers is flat out stupid however. Shipping freight cranes are large and seemingly more expensive, however they are safer to operate and maintain. I believe that transportation of shipping containers should be relegated to trains however, utilizing train tracks to run directly into freight yards and unloading into warehouses that are built along the rail system. From the warehouse, companies can utilize either shipping vans, or upgrade to drone shipment for more efficiency. housing areas should be built around such infrastructure to minimize the possibility of a drone going beyond its signal range and losing battery power. Building amenities around warehouses can also make the movement of goods more efficient and reduce fuel/power consumption. Instead of tall skyscrapers with offices in a city center, building down can unearth history and maximize work space while clearing airspace for movement. So imagine a city built underground, warehouses on top, a shopping mall built around it, housing built around that, air shipping within close proximity for fast and efficient delivery, and underground networks connecting all infrastructure like a web, preventing nature from being destroyed by the construction and expansion of more roads and railways. BAM! civic development and planning is easy!

@johnroutledge9220 2 жыл бұрын

I assumed that image referred to an air-crane, not a shipping container transport as such. That would be short range, and could open up a lot of flexibility for loading and unloading containers, especially from small islands. A big ship might not even have to stop or slow down while picking up or dropping off a shipping container or two from a 'micro port' that is little more than a car park. Even in a large port it would allow a ship to unload a few containers and then leave, rather than waiting for a berth to become available, and getting into and out of that berth.

@sk3143 8 ай бұрын

Orca aircraft!!

@foxtrotunit1269 11 ай бұрын

Wish the throat could be inflatable, so when deployed it pops out and directs air. When deflated it stows away automatically under spring/tendon pressure. Less parts, less problems.

@aliptera 2 жыл бұрын

Ducted propellers have a big disadvantage: weight. To be effective, the duct-propeller tip distance needs to be very small, so the duct needs to be very stiff - this leads to a lot of extra weight. In most conditions a larger propeller is a better alternative than using a ducted propeller for increasing lift. Adding mechanical stuff to vary the duct intake geometry increases weight even more, probably more than the extra lift produced.

@frankyflowers 2 жыл бұрын

if one of my toys had that id rip it off.

@curtisfoster540 2 жыл бұрын

Yup. And anyone want to try counting the additional moving components associated with this design, per motor, as compared to open prop models? Moving components = likely point of failure. And each one of those components jamming would impact stability during any flight mode. Autopilot can certainly correct for this during most circumstances, yet evtol's already have a LOT of things to manage to safely fly. This might be a bit risky for an already risky new transportation mode and industry. And yet, I'm rooting for them and all others in this field.

@daszieher 2 жыл бұрын

I believe Joby have hit the mark with a fairly high disk loading and relatively small diameter propellers regardless. As their videos show, the craft is also sufficiently quiet. There should be less talking and more building 😉

@frankyflowers 2 жыл бұрын

@@daszieher i believe joby is a scam. find the longest video of it flying without edits. they would have documented its 150 mile flight and it wasn't even manned. it can't stay up very long with a person.

@daszieher 2 жыл бұрын

@@frankyflowers I don't believe anything, I just evaluate what I can see. We know that it is silent and it is capable of hovering and transitioning to forward flight. Already quite impressive. We'll see about the performance stats, when we get to see them.

@115_vaibhavidangre4 Жыл бұрын

can someone tell me how the flaps and duct are connected to each other?

@user-ol1qm9ey7g Жыл бұрын

เหมือนพวกคุณจะหาทางออกให้กับพลังงานไฟฟ้าใช่มันต้องมีแบตเตอรี่มากกว่า 1 แบบ

@eliwolf4172 2 жыл бұрын

For knowledge

@yuniorprades3023 Жыл бұрын

Watching eagles flying they use a ducted fun shape when they flying.exactly like a Hart shape so yes ducted fan is efficient .there is a few things must solve but yes win blow faster throght

@SurvivethePoleShift Жыл бұрын

Why is Noise Cancellation Theory not put to more use....where noise is cancelled out by harmonics.

@monkeysfromvenus 2 жыл бұрын

Those battery powered cargo container drones look kind of ridiculous. Wouldn't running them with traditional engines be a lot more feasible?

@canofpulp 2 жыл бұрын

But the added cost and complexity won't pay off unless your hovering lots

@ronplatt6008 Жыл бұрын

How about toroidal props and put them in ducts

@dezmondweghe2588 6 ай бұрын

Surely the next 'up-grade' should be 'Toroidal' propellers/fans' for an even larger increase in thrust & efficiency ?? >>

@UncleSpuddy 2 жыл бұрын

If only we could get better batteries. Electric vehicles could progress so much.

@hidden4209 2 жыл бұрын

Now add thurst vectoring... 😉

@kristofnagy5829 2 жыл бұрын

Trough out aviation history, a lot of companies have experimented with ducted fans in all kind of implementations and they always ended up with the same result. It is good until there is a flow across the plain of the fan. The system looses nearly all thrust in case of the slightest P-factor. This automated segmentation will cause a lot of headache to the developer team, if they manage at all. It is an unsafe and unnecessary overcomplication in my eyes.

@ethanmorrison6199 2 жыл бұрын

We’ll find out

@nibblernibbles3205 2 жыл бұрын

Good point about the effect of horizontal velocity. That's what limited the potential of the one-man ducted fan platform the US Army made. Lost thrust at modest horizontal speeds. On the other hand, I think this concept goes hand in hand with tilting rotors, so they are never meant to have in-plane air velocity.

@kristofnagy5829 2 жыл бұрын

@@nibblernibbles3205 That's true. As you said "never meant to". What about wind shears, or turbulent weather conditions?

@xevious2501 11 ай бұрын

@jonathanblanckaert 2 жыл бұрын

Why do ducts on fpv drones reduce efficiency?

@itsthorondil7608 2 жыл бұрын

Most FPV drones are more akin to a multirotor helicopter. The duct not only adds weight, but drag. It also blocks a large percentage of the airflow coming towards the prop when flying at an angle, as such drones often do. Think of an EDF Jet. The airflow is almost always coming straight into the inlet. In a drone, that is rarely, if ever the case. So it just doesn't make sense.

@jonathanblanckaert 2 жыл бұрын

@@itsthorondil7608 yeah i noticed that, so it thought on big VTOLs it would also introduce drag

@user-ib3ke5ee4u 11 ай бұрын

simply ducted and multiple layered blades increases air-flows efficiently.

@ltitus8900 Жыл бұрын

I think our 1940s selves will be very disappointed in us.

@robsonpereira3001 2 жыл бұрын

HAPPY HAPPY FOR FUTURE ...TRANSPORTATION !!!! 🇧🇷🇧🇷🇧🇷🇧🇷🇧🇷🚁🛩✈️🚀

@fdm6337 Жыл бұрын

Dyson has all the answers

@omnianti0 2 жыл бұрын

500kw per ton its just 20Mw for a container its like using two dragster instead of a tractor rule of cool

@NeilStainton 2 жыл бұрын

A well designed propeller is approximately 85% efficient. A propeller can be a much larger diameter than a ducted fan giving a higher Froude efficiency. So the efficiency improvements you quoted are totally unachievable. They aren’t even make-believe, they are mathematically impossible. There is no way that even a variable geometry ducted fan will be more efficient than a propeller as a vertical lift device. I can see that a fan could be a little quieter and allow the vehicle to have a higher maximum speed.

@ThatBoomerDude56 2 жыл бұрын

They're also adding a bunch of weight with all that mechanism.

@StaK_1980 2 жыл бұрын

Well, they did state that the normal propeller is better at lift.

@johnroutledge9220 2 жыл бұрын

And for this reason a helicopter will always be more efficient at generating lift. But there's several reasons why no one is proposing a helicopter eVTOL.