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Something truly amazing comes from Turkey: some students from Sakarya University just released a prototype of what seems to be a car… but a car that consumes no more than a liter of hydrogen in a range of 568km (355 miles)!
Their new hydrogen car, called SAHIMO, weighs 110kg and was voted as the third-most fuel-efficient vehicle in the 26th Shell Eco Marathon contest last year. The student team behind the project is now looking at how to almost double the distance on the same 1 liter of hydrogen: 1000km.
Originally posted by warrenb
Why do we have to keep waiting for these things when they are already available?
568km/L of hydrogen, and it's only the third most fuel-efficient car?! Hmm......
Originally posted by UFOTECH
You guys did look at that care didn't you? It looks like a toddler could flip it over from the side like a turtle. It is tiny and no way that could go on the road.
Right now, producing hydrogen is expensive and energy intensive. It takes about six gallons of gasoline to make and compress a little over two pounds of hydrogen, which carries about the same amount of energy as a gallon of gasoline.
Originally posted by XL5
It can probably do that because it goes 20kmh and takes 1-2 minutes to get there. Scale it up, fit two people in it and make it go normal car speeds and acceleration and it will get the same or a bit better economy then a mini.
If you double the weight, you need 4 times the power for the same performance.
568km/L of hydrogen, and it's only the third most fuel-efficient car?!
One liter of hydrogen but is that one liter at atmospheric pressure.
Or at 5000 psi
Or liquid hydrogen.
With hydrogen that would be a lot of hydrogen if liquid hydrogen.
One liter at atmospheric pressure might float a balloon. But not much elce.
Originally posted by Edrick
The only problem with fuel efficiency in cars is weight.
The more a car weighs, the more fuel it is going to use, period.
IT is simple physics.
Force = Mass * Acceleration
As you increase the mass of the object being accelerated, you increase the amount of force required to do the acceleration.
Yes and yes BUT. The future of automotive efficiency involves regenerative systems. Hybrid cars today actually use a rudimentary form of regenerative systems. It solves the weight problems with efficiency.
What's in it for you? Of course, you follow the simple rule of F=M*A. To accelerate to a certain speed, you consume energy. Thus, the more massive the vehicle is, the more energy is consumed....
BUT that is where it ends with regenerative systems. The more massive and higher speed is attained, the more energy is restored to the system via *electromagnetic(dynamo) braking*
A 100% efficient regenerative system will actually make it look like your car weigh nothing at all if you drove on very hard tires. In reality, up to 90% efficiency is attainable and that is still a very good figure!
Originally posted by Edrick
Yeah, but you still have to overcome Mass induced friction, and you can't get that back with regenerative braking.
Plus, you still NEED more power to accelerate, and even if you use regenerative systems, you still need more "Temporary" storage (Batteries) to hold all of that power in order to use it again.