• Cars

    Compressed-Air Cars Planned for Airport Test, US Launch

    By Mike Spinelli Posted on 11.6.2008 15 Comments

    The idea of using compressed air to propel a passenger car has been kicking around tech circles for years. Now, Luxembourg's Motor Development International SA (MDI) may have the first viable angle to launching a first wave of air cars: airport transportation. Behold the AirPod, a four-wheel, multipassenger minicar set to be built in Nice, France. It's one of the brainchildren of Guy Nègre, a former aeronautics and Formula One engineer who's been messing around with compressed-air technology in passenger cars for nearly two decades.

    11.23.2008 at 09:54pm - Comment by CharlieA

    For Yetihehe --- a tire pump compressor won't work. Those are good for up to around 150 psi or 10 bar. The air cars must use 300 or 350 bar (4350 or 5000psi) in order to get enough energy stored to go even a few miles. The storage tanks are around 400 liters of internal volume. For comparison, the most common scuba tank, an "aluminum 80" is 11 liters at 200 bar. So the storage volume of the air car will be about a much air as in 70 scuba tanks, and the weight of just the air alone (not including the tanks) will be over 400 pounds. Ask your local scuba shop how big of a compressor and storage bank they use for scuba tanks, and how much it costs them to fill 70 of them. This is quite different than the wimpy little compressors used to fill tires. An air car that had decent operating range would still be a good idea, even though the overall efficiency would be rather low because of the excess heat that must be dumped while compressing air. The real problem is that compressed air is a heavy and bulky way of storing energy. That's why the prototype could only go 7.22km.

  • Cars

    Compressed-Air Cars Planned for Airport Test, US Launch

    By Mike Spinelli Posted on 11.6.2008 15 Comments

    The idea of using compressed air to propel a passenger car has been kicking around tech circles for years. Now, Luxembourg's Motor Development International SA (MDI) may have the first viable angle to launching a first wave of air cars: airport transportation. Behold the AirPod, a four-wheel, multipassenger minicar set to be built in Nice, France. It's one of the brainchildren of Guy Nègre, a former aeronautics and Formula One engineer who's been messing around with compressed-air technology in passenger cars for nearly two decades.

    11.23.2008 at 09:46pm - Comment by CharlieA

    MDI may say this isn't vaporware, but they have a track record of making promises of mass production that aren't met. First the introduced the e.Volution in 2000, saying it was going into production in France in 2000 and South Africa in 2002. Then they announced air powered taxis to be mass produced in Mexico in 2003. None of this happened, and the e.Volution quietly disappeard. In its place was a series of CAT cars, such as the MiniCat. It was announed as going into production in 2005. Nothing happened. Then in early 2007 they announced that Tata Motors had licensed the MDI design and would build 6,000 cars in summer 2008. But in summer 2008 Tata said that the design and technology were nascent and not ready for production in the near future. So now we have yet another version of the air car announced. And they say THIS one isn't vaporware. Meanwhile, no auto magazines have ever gotten to test one of their cars. The only test data ever published was some old stuff on MDIs website where their prototype could only manage 7.22km (less than 5 miles) before running out of air. They then did an analysis where they hypothesized improvement after improvement after improvement and claimed that these paper improvement would increase range by a factor of 30 to about 120miles. Since 2000 they have used these sort of numbers for the range, without ever having publically shown that they can actually do it. Vaporware is a charitable term for these non-existent cars.



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