Vickrin
Vickrin t1_iyf4kgg wrote
Reply to comment by wedontlikespaces in Rolls-Royce successfully tests hydrogen-powered jet engine by Majnum
I don't get how people aren't seeing this.
Any engineer could do the maths on this in an afternoon and see that hydrogen is not a viable fuel for aviation.
It requires too much weight to keep it stable.
Vickrin t1_iyf4gnj wrote
Reply to comment by Enchydrogen in Rolls-Royce successfully tests hydrogen-powered jet engine by Majnum
> I think hydrogen will have a major role to play in the future of airports and aircraft.
It's not going to happen.
Vickrin t1_iy98rkb wrote
Reply to comment by AzzaClazza in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
And a tank that can hold hydrogen weighs a lot
Vickrin t1_iy78740 wrote
Reply to comment by Funktron3000 in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
What could go wrong?
Vickrin t1_iy6fu6d wrote
Reply to comment by ogbcthatsme in Elon Musk’s Boring Company ghosts cities across America - The tunnel venture has repeatedly teased local officials with a pledge to ‘solve soul-destroying traffic,’ only to back out by asteriskspace
He's just the monorail guy from the simpsons.
Except the monorail actually existed.
Edit: Just realised a BUNCH of people beat me to it with this comment.
Vickrin t1_iy5ohqn wrote
Reply to comment by A40 in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
Exploring the concept is never wasted, people might learn something.
Putting a hydrogen engine in an aircraft is not going to be a viable option for the forseeable future.
Aircraft are probably one of the hardest things to move to a green fuel source.
Batteries are also awful when it comes to aircraft.
Vickrin t1_iy5hgyq wrote
Reply to comment by A40 in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
1kg of diesel can sit in a metal tank, at room temperature, no pressure needed.
Do you know how much space 1kg of hydrogen takes up?
Liquid hydrogen needs to be stored at -250c at 1 bar or more of pressure. This requires high strength storage. This means your 1kg of hydrogen ends up actually weighing a hell of a lot more than 1kg. Keeping it cool also requires energy which means you get even less out of your hydrogen fuel.
Sure you could store it as a gas but that would require 350-700 bar of pressure which requires even MORE expensive storage.
It's not as simple as the raw maths.
Can you imagine the damage if a train derailed with high pressure hydrogen tanks? Diesel doesn't explode and neither does electricity.
Vickrin t1_iy5ewxj wrote
Reply to comment by A40 in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
Hydrogen is not energy dense, it would require extremely high pressure storage which is heavy as hell and expensive.
Vickrin t1_iy5epcy wrote
Reply to comment by myflippinggoodness in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
>but everything here is so spread out
Build longer tracks?
Japan's rail system covers the entire country. It's not just metro areas.
Vickrin t1_iy5cjcj wrote
Reply to comment by myflippinggoodness in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
Hydrogen is just a poor fuel compared to hydrocarbons.
Hydrogen takes up space and is heavy in the quantities you'd need.
Electricity is great because you don't need to ship it with your goods.
People trying to reinvent the train should just try trains first.
Japan has an amazing train network and yet nobody is copying them.
Vickrin t1_iy59co5 wrote
Reply to comment by A40 in 'Landmark achievement': Rolls-Royce and easyJet hail successful hydrogen jet engine test by Wagamaga
Do you know how much hydrogen you'd need to travel 5000kms?
Just put up some power lines...WAAAAY more practical.
Vickrin t1_iwrzr6r wrote
Reply to comment by Agile-Cancel-4709 in Rats bop to the beat of music by Mozart, Lady Gaga, Queen; bopping was previously thought to be an ability innately unique to humans by marketrent
I'll gladly believe you if you can find me a video of a bird dancing in time to the beat.
I've yet to see it.
Vickrin t1_ivuz5y3 wrote
Reply to comment by bitfriend6 in Elon Musk to turn Twitter into payment platform for dogecoin and crypto by MidoriTea
> Tesla taxi service
The magical taxi service he promised years ago which is further away than ever?
Vickrin t1_ivh09c7 wrote
Reply to comment by jarsnazzy in Two 15 year olds are interviewed inside their max-security prison cell by MiddleUziVert
Land of the free^(*)
Vickrin t1_isz93me wrote
Reply to comment by das_mueller in Workers at Apple stores in Australia went on strike for an hour and are refusing to repair AirPods or handle deliveries in a dispute over pay and conditions by Sorin61
Earwax is definitely a problem on some, people are disgusting.
But no, airpods do fail a fair amount.
Vickrin t1_is7rhov wrote
Reply to comment by lacheur42 in TIL at the end of the Top Gear US Special after arriving in New Orleans, the hosts gave their cars away instead of selling them as originally planned after seeing the damage from Hurricane Katrina by PrettyPinkPonyPrince
Because police in Alabama are totally reasonable people who will be on your side.
/s
Vickrin t1_iyf4pmm wrote
Reply to comment by Enchydrogen in Rolls-Royce successfully tests hydrogen-powered jet engine by Majnum
> rather the way in which it is currently stored in gaseous form will improve as technology progresses
Technology cannot change the laws of physics.
There is a base minimum amount of space requires to store gaseous hydrogen, if you go below that you get liquid hydrogen and even bigger storage problems.