Are Electric Planes Possible?

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Ian Macfarlane : What about if we use Duracell? Eh? You never thought about that, did you?

Christian K : 97.1% Male Viewers, there is more sausage on this channel than on a german bbq party

Kevin Bauwens : Starts watching. Sees explanation about batteries being 40x heavier than kerosine. Makes sense, I'm happy I know this now. But starting at 2:12 I felt more and more stupid and I should go back to my coloring book :(

MadProductionsink : I don't think aerospace engineers use these equations. I like to think that they just put engines on a plane and if it doesn't fly they just put bigger engines and that's it.

Russell Schwartz : 5:20 “Doubling the mass will increase our power requirements 8-fold.” This is incorrect. The factor of 2 in the power equation is present in the calculation for both the lighter and the heavier plane, meaning it can be factored out. Doubling the mass increases our power requirements by a factor of 4.

TierZoo : Psyched for the next episode! Always been curious how hydrogen works as fuel.

kelan andersson : What happens when you throw the potential of graphene based batteries into the equation? Would this become feasible for a full sized passenger plane, such as the A320?

The Ultimate Reductionist : 2:45 You really should not write "delta-v" for velocity. It should just be "v" - the velocity.

Ken Wade : Kanye?

Reuben Mason : Mass is squared and doubled so starts at 2m^2. doubling mass gives 2x(2m)^2 = 8m^2. 8m^2/2m^2 =4 rather than 8

Erik Broeders : There's a joke about Belgians I particularly like (I'm Belgian btw) The Belgians invented an electric car. Costs 1 million dollars though. 100k for the car, the rest for the extention cord.

lightdark00 : 2.9% females in the audience. That should reflect closely with how many females are actually in engineering. If there's more, that's a fail on society.

Rib Be : This doesn't take the aircraft's speed requirement into account. An airbus A320 would need electric ducted fans that can accelerate air to transonic speeds. During cruise the motors would have to put out at least (100% effcient fan) 4,000 kW of power to produce enough thrust and more than 20,000 kW during takeoff. Electric motors that powerful are WAY too large and heavy to be used on airplane and I'm not even going into the battery requirements...

Supadubya : Bad assumptions built on bad assumptions. For instance, the formula completely ignores Lift/Drag (planes don't pay the energy cost for Lift, they pay for Drag- which is much smaller) ratio for most of the video, or how that changes with cruising speed... Electric planes can achieve longer range by flying at slower speeds, or with higher mass-fraction dedicated to batteries (not an unreasonable solution since batteries are much denser in terms of mass per unit volume than Kerosene...)

Robert Wilke : I'm really impressed how you were able to drag this out to a 10 minute video.

Justin Y. : Anything is possible when you believe in the power of god and anime.

agat882 : And also you should keep in mind that Li-ion battery failing at low temperature, and wouldn't be any safer than kerosene. I guess the only real option with already existing technologies for electrical airplane is portable nuclear reactor. I understand, that we won't see those any time soon too (just imagene if such airplane crush in to some city), but Brian do you think this is theoretically possible - nuclear powered plane?

Heavymetal122 : Is that Trent Palmer's KitFox at 3:05?

Fiskebullar : What about using Graphene batteries when it is developed

juki0h tuki : algae biofuels can be converted to jet fuel

Can we get 5000 subscribers with no videos? : Just walk lol

Luis FF : Puts the passengers riding a static bicycle to generate the energy. This will save mass, fuel and make cheaper prices.

Ali Ganama : electric pisi

Dub kicks : U lost me at triangle

Freddy Fink : well hey there trent palmer in his freedom fox ;)

Cbeddoe19 : Isn't a direct comparison energy density of kerosene and batteries incorrect? Aren't you ignoring the energy conversion efficiency of each source? Gas turbines max conversion efficiency is approximately 40%. Electric batteries max conversion efficiency is approximately 90%. That helps batteries out quite a bit. Would make your calculations off by 50-60% if you didn't incorporate them. Batteries still need to get about 20x better. All your arguments are still valid.

MASTER GOATY : No I just saved you 10 min of your life.

Diego C. : I've heard that the "Moore's Law" of batteries is that they improve in energy density by ~5% per year. If that trend continues, it'll be decades until they get close to the energy density of fossil fuels. They're already at or close to the point where they're good enough for cars, but it may be quite a while before they're good enough for airliners. However, there's _a lot_ of research going into battery technology right now. A big breakthrough could change everything.

Certified Brain Surgeon : you would not have sufficient amount of battery graded graphite to support such a large operation on this scale. the graphite industry is already struggling to keep up with the demand of electric vehicles, and with the projected future growth of the EV market, graphite will be consumed at a very rapid pace. its just not feasible.

hi hi : 1:63 Lul I'm 14

jibeneyto : Good video but using an "x" to denote multiplication next to an "x" that's a variable killed at least three cute puppies.

2016KTM450 : Ok, if we are going to pretend this is real engineering then lets see actual numbers. Its apparent to me that equipping the Cessna 172/182 for electric flight would take the majority of the usable weight resulting in the aircraft having very little utility and probably no passengers. And no, there will never be a perpetual flight capable aircraft of any type nor one that flies without using something expendable. Even the little Pipistrel ALPHA Electro LSA will be using fossil fuels indirectly (as most power plants burn coal) and there is energy lost in charging that is typically not accounted for in advertised claimed energy consumption nor mentioned in the boasts of electric motor efficiency.

SimplePhotos : Was 1:51 *your attempt at a joke?*

Akhil Nair : How exactly would u power a plane with electricity though? Propellers?

kapil busawah : What the efficiency of battery vs kerosene? Batteries would last a fair bit more than the calculated values here. Also one major limiting factor that affects fuel planes is of course the air fuel mixture process. Because of this fuel planes have limitations on their altitude as going higher has less air. But we know electric planes don't use this process and can go higher while improving performance. Also we know the higher we go the less drag there is and so the calculations should've incorporated this as this would again affect range by a large margin. But even still, electric planes are not possible for large commercial use for the same aforementioned arguments. Still good valid points and I really like that but the calculations neglected electric planes can go far higher, at least with the cessnar model, which I think is quite the fatal error

Lord Manners : 1:53 97.1% of us are males

Adam S : make the propeller a wind turbine, problem solved

Rajat Sharma : Why don't engineers attach some kind of a windmill mechanism that can be toggled once it reaches a cruising speed and altitude and then use the power generated for something useful? I am just wondering and have no technical knowledge about planes.

Jakob : Real Engineering? For real you forgott to calculate the weightsaveings of an Emotor in and there is no such thing as Electric Turbines, They need fuel to work you cant slap an e motor on there. Still why hast the electricity come from batteries why not hydrogen. Dont call you real engeneering and then talk something a 5 year ould can figure out .

Adri Hooijer : 8:36 "And if we fly very slowly with low drag wings we can even build a solarpowerd drone that never has to land" AND IF IT GETS DARK!!!????

seasong : Wouldn't it make more sense to combine this with solar panels? It's always sunny above the clouds.

Maximum Maxx : I think they should use hydrogen instead of electricity because it has better energy density

UnOff Beat : I've seen so many! But they all are ultralights not planes.... I luv ur channel!

Jeff Lebowski : What if the electric motors were powered by a small generator, like a hybrid car and diesel train is.

Peter Kehayov : Falcon nine and fossil fuel? How are oxygen and hydrogen fossils?

NS RIDER : better than my science class

Mahmood Nabeel : Summary : blah blah blah no you can't.

id104335409 : Can you do an episode on vacuum airships and the math behind what it would take to lift like 100kg of useful cargo?

Franco Staub : "It just so happens that the total power needed to fly is minimized when the force of lift and the force of drag become equal." 4:58 I had to laugh at this one. Look up lift-to-drag ratios and you'll see why. I think you misunderstood the minimum power requirement flight condition. It's not where lift equals drag, it's were lift-induced drag equals parasite drag. Even this is a simplification. Anyways, I like your work and I know these are "back of the envelope" calculations, but maybe double check your content on this one. Cheers man and keep up the good work.

YouTube Police : *Ahh maths, we meet again!*