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Post by bhuvanaerospace1 on Sept 7, 2024 0:29:08 GMT -5
Which fuel can give more thrust?
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Post by racket on Sept 7, 2024 1:00:52 GMT -5
they all give the same thrust
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Post by bhuvanaerospace1 on Sept 7, 2024 20:21:42 GMT -5
ok sir..but now I have a question which is idiotic but still, why electric power is not used to give the thrust for big vehicles,i.e,rockets, aeroplanes,etc.?
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Post by racket on Sept 7, 2024 22:01:08 GMT -5
Because you end the flight with the same weight as you started , not the best way to do things
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Sept 12, 2024 12:18:42 GMT -5
ok sir..but now I have a question which is idiotic but still, why electric power is not used to give the thrust for big vehicles,i.e,rockets, aeroplanes,etc.? Fuel, such as kerosene, is about 50 times more energy dense than our current electrical battery technology. For example, a Boeing 747 at full fuel capacity carries about 200,000 pounds of fuel. To store the same amount of electrical energy as the kerosene, you would need a battery that weighed about 10,000,000 pounds on board the plane. It is just unrealistic with our current tech. |
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richardm
Senior Member
Joined: June 2022
Posts: 413
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Post by richardm on Sept 12, 2024 15:12:23 GMT -5
Fuel, such as kerosene, is about 50 times more energy dense than our current electrical battery technology. For example, a Boeing 747 at full fuel capacity carries about 200,000 pounds of fuel. To store the same amount of electrical energy as the kerosene, you would need a battery that weighed about 10,000,000 pounds on board the plane. It is just unrealistic with our current tech.
Also note that as a plane burns fuel it becomes lighter and more performant and efficient. A battery as good as it could become, will always weigh the same full or empty.. This will have to be accounted for when comparing the total efficiency factor of kerosene vs a battery ( if they ever get to develop a battery capable of sustaining such a comparison .)
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Post by bhuvanaerospace1 on Sept 13, 2024 1:56:14 GMT -5
Thank you so much for the answer from both...
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Post by bhuvanaerospace1 on Sept 14, 2024 20:57:59 GMT -5
Sir, we are thinking to use hydrogen fuel in our plane, but we don't have a licence. So which fuel is most cheap and easy to get(Also not polluting the environment)?
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richardm
Senior Member
Joined: June 2022
Posts: 413
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Post by richardm on Sept 15, 2024 4:09:19 GMT -5
Stop dreaming get serious.
Hydrogen is out of reach for most of us and is dangerous in the hands of inexperienced persons .
Fuel cost ? You should know better than us how much different fuels cost in your country .
Most members of this forum will be glad to help but your questions are quite often irrelevant.
This is my opinion and it does not imply any other member of this forum.
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cutaway
Member
Joined: October 2020
Posts: 11
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Post by cutaway on Oct 3, 2024 18:32:16 GMT -5
Not sure on what electric propulsion you are referring to here, if you are on about ionic thrust it does exist but as of this time its still under development.
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Bhuvan Aerospace
Veteran Member
Making BAK-3 Turbojet Engine.
Joined: August 2024
Posts: 211 
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Post by Bhuvan Aerospace on Oct 11, 2024 14:24:13 GMT -5
YES. they all are right. I also explained you personally that Battery power is very less efficient as compared to fossil fuels or Hydrocarbon fuels. You will need a 70-80 kg battery to produce 100 kg of thrust. But you need only 15-20 kg Turbojet engine (fuel included) to produce 100 kg of thrust. Also, the weight of the fuel on the pylons decrease as the plane's travelling distance increases but the weight of the battery remains same before the takeoff and after the landing too.
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