Earlier quoted context omitted.
When you do steam methane reforming to produce hydrogen, separating out the CO2 is a necessary step in the process. Then it's just a matter of storing it underground, rather than just emitting it.
Are there any commercial examples of carbon sequestration? We've heard that line for decades now, if it's real there should be plenty of production sites by this point.
The age of electric flight is finally upon us
181–190 of 272 posts
Re: The age of electric flight is finally upon us
#182Earlier quoted context omitted.
Those tweets have been deleted, and where’s the evidence of these claims?
Try this link: https://twitter.com/BenBrelje_says/status/106484220091004108... I believe tristanb cut & paste his own post from six months ago on this same topic, and it broke the links.
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Re: The age of electric flight is finally upon us
#183Earlier quoted context omitted.
Those tweets have been deleted, and where’s the evidence of these claims?
Yeah, I see this kind of thing repeated any time Eviation comes up. I don't believe them. The design is sound, if radical in the decision to be mostly-battery. And I think that's partly why people are so skeptical: it definitely goes counter to the industry grain. But it IS the right way to build a serious electric aircraft for regional/commuter passenger travel. Pressurized, extremely high lift-to-drag ratio, very h…
The design is "sound" ? It is ridiculous! Those engines are at each end of a wing. That is a 100% no no. They are feet from the ground, and would make one engine out operation impossible. Even someone with a cursory understanding of aerodynamic could see this is a ridiculous design.
Re: The age of electric flight is finally upon us
#184https://twitter.com/BenBrelje_says/status/106484220091004108... https://twitter.com/BenBrelje_says/status/106485722028904038... https://twitter.com/BenBrelje_says/status/106491195862390374... To recap, based on financial statements the company: used to be a "waste management" company that failed and was sold as a "public shell" to enable the formerly private company to go public and sell shares (the waste management…
Those tweets have been deleted, and where’s the evidence of these claims?
My links were bad - fixed.
Re: The age of electric flight is finally upon us
#185Earlier quoted context omitted.
Electric motors can enable something which jet fuel and gasoline cannot: beamed power. There could be a new class of vehicles which only have a small onboard power store for emergency purposes. The weight savings would be about 20%.
That is a fascinating idea, a plane being "handed off" from one beaming tower to the next, like a cell phone
It would be very interesting to see airplanes powered by Tesla towers.
Re: The age of electric flight is finally upon us
#186How feasible would replacing the battery during the flight via a flying refueler ( similar to how fighter jets operate) be?
Re: The age of electric flight is finally upon us
#187Earlier quoted context omitted.
Yeah, I see this kind of thing repeated any time Eviation comes up. I don't believe them. The design is sound, if radical in the decision to be mostly-battery. And I think that's partly why people are so skeptical: it definitely goes counter to the industry grain. But it IS the right way to build a serious electric aircraft for regional/commuter passenger travel. Pressurized, extremely high lift-to-drag ratio, very h…
The design is "sound" ? It is ridiculous! Those engines are at each end of a wing. That is a 100% no no. They are feet from the ground, and would make one engine out operation impossible. Even someone with a cursory understanding of aerodynamic could see this is a ridiculous design.
Better tell NASA, then, which is building a design (X-57) with the same kind of wing-tip propellers: https://www.youtube.com/watch?v=No9Rq3VE0FI
The key is that the Alice aircraft is capable of take-off with just the rear propeller. That's possible because electric motors (unlike jet engines) can operate at much higher power for short periods of time. It was addressed recently at the Paris airshow Q&A for Eviation. If a wingtip motor (not engine) fails, the other side is designed to immediately stop (electric motors such as these respond immediately to input) and flight continues with the remaining tail motor.
Additionally, electric motors are fundamentally more reliable than jet engines.
Re: The age of electric flight is finally upon us
#188Earlier quoted context omitted.
> hydrogen will diffuse through it in just few weeks This one is a non-problem. I don't think there is any civilian airport with enough fuel storage for two weeks. (But the tank weight, well that is a problem.)
Very many are supplied by pipelines though to avoid that need.
Yes, and they could be supplied by electric conductors just as easily.
The ones that aren't supplied by pipelines have trains or fleets of trucks supplying them. Those would see a gain on using water, electricity and some mildly expensive machinery.
Of all the very relevant problems of using hydrogen on planes, long term storage is not one of them.
Re: The age of electric flight is finally upon us
#189Earlier quoted context omitted.
The design is "sound" ? It is ridiculous! Those engines are at each end of a wing. That is a 100% no no. They are feet from the ground, and would make one engine out operation impossible. Even someone with a cursory understanding of aerodynamic could see this is a ridiculous design.
Better tell NASA, then, which is building a design (X-57) with the same kind of wing-tip propellers: https://www.youtube.com/watch?v=No9Rq3VE0FI The key is that the Alice aircraft is capable of take-off with just the rear propeller. That's possible because electric motors (unlike jet engines) can operate at much higher power for short periods of time. It was addressed recently at the Paris airshow Q&A for Eviation. I…
FWIW my thoughts:
1. Rear prop strikes. 2. Wing tip prop strikes. 3. Wing tip inertia 4. Prop wash over a wing is a good thing If (big if) this thing ever flies, it won't be in this form
Re: The age of electric flight is finally upon us
#190As others have noted, electric flights require a major breakthrough in the battery technology. Here are energy density numbers for gasoline, jet fuel, and lithium-ion batteries: Gas and jet fuel specific energy density ~= 45 MJ/kg; Lithium-ion specific energy density Even worse, a jet engine is much better at generating power. A modern high-bypass turbofan engine can generate 10 kW/kg whereas an electric motor is aro…
Also during the trip, your fuel tank gets lighter but your battery does not.