Linked Questions

0
votes
1answer
280 views

Do all passenger aircraft have a nickel cadmium battery? [duplicate]

In the event of both the engines failing in a double engine aircraft, does the aircraft a have nickel cadmium battery to provide propulsion to make a successful landing?
0
votes
2answers
304 views

Is it possible to power a very small jet using batteries? [duplicate]

I have read a lot of answers on batteries powering large commercial jets, and how it won't work. However, for a small jet like the Honda jet, would it be possible for it to be powered completely by ...
0
votes
1answer
277 views

All Electric Jets [duplicate]

I've been researching electric jets, and I have seen a number of schemes. What is the most likely way to build an all-electric jet engine, assuming that the power source is available and practical?
2
votes
1answer
110 views

Why can’t electric motors be used in aviation [duplicate]

Why can’t electric motors be used in aviation? Is it a problem with batteries, torque, or what? From what I’m aware motors at high torque are expensive and need a massive footprint, than a high rpm ...
0
votes
0answers
80 views

Is An Electric Plane Possible? [duplicate]

I know we have electric cars already. But in the future we’ll eventually have to use something cleaner than gasoline and gasoline is running out! So is it possible to have a battery powered turbofan ...
24
votes
4answers
20k views

Why do turbofan blade tips exceed the speed of sound while prop tips should not?

It seems that the tips of the fan of a turbofan engine can and do break the sound barrier: The GE-90 has a fan diameter of 3124 mm and a rotational speed of 3475 RPM. Their circumferential velocity ...
19
votes
6answers
19k views

How many kilowatts to get an electric 747-8 airborne?

Reading about the Airbus E-Fan and it's dual 30 kW thrust fans caused me to wonder: assuming the need for four electric fans, how many kilowatts would be required to power each fan with enough thrust ...
12
votes
4answers
2k views

Are there any hybrid electric planes?

Are there any hybrid planes (planned), or would this be impossible because we don't have big enough batteries?
16
votes
2answers
19k views

What are the advantages and disadvantages of ducted fans in designs such as the Airbus E-Fan?

I have read that it increases thrust and reduces noise. Is there a downside to this? (Image source: Wikipedia)
11
votes
2answers
2k views

What materials are used for the gas bags in hydrogen airships?

I heard that to construct a hydrogen blimp or airship, the gas bag must be coated with aluminium, which got me confused: doesn't it add significantly to the weight? Is aluminium really used, and is ...
3
votes
4answers
863 views

What are the hurdles to overcome before purely electric commercial aircraft can fly?

What are currently the largest issues with purely electric commercial aircraft (large scale ones like the size of a Boeing 737)? Are there any organizations right now that are trying to solve those ...
-9
votes
3answers
451 views

Chemtrail Conspiracy theory [closed]

Could this be true? https://www.facebook.com/migyal.imisyou/videos/2514422715448542/UzpfSTEwMDAwODE2OTc1NjA4NDoyMDQxMDc4Nzg2MTc0NDI3/ A friend has posted this - of course, I have been looking ...
7
votes
1answer
1k views

What is the theoretical maximum velocity of electric aircraft?

I'm wondering about theoretical maximum velocities of supersonic electric aircraft. I think the fastest demonstration of any type of aircraft has been close to mach 10. This was done using a rocket ...
4
votes
1answer
1k views

Is there a limit to the possible altitude for electric jets?

So I was thinking about Elon Musk's supersonic electric jet idea. Assuming we have sufficiently energy-dense batteries, where would the limits be in terms of speed and altitude. His logic seems to ...
3
votes
1answer
493 views

Are there any programs to build a hydrogen powered airplane?

So called "renewable energy" is a buzzword these days. Auto manufacturers are starting to roll out hydrogen powered cars. Hydrogen may not currently be the most efficient or economic fuel for jet ...

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