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OneCAT drivers lacking an industrial compressor or air bank would need to plug in the car's little electric onboard compressor, which can fill it in four hours. A slow charge like this would be a good bit more efficient, actually, as the storage tanks wouldn't get so hot. Any diver who has spent a lot of time charging up air bottles knows that the faster you do it, the hotter the air gets. As it then cools down to ambient temperature, much of the pressure you thought you had dies away.

So the air car's main advantage over battery vehicles - the quick charging - may not be quite all it seems. The heating effect also means that air compressors waste a lot of the energy you use to drive them, because they get very hot.

Doubts as to the claimed range are enhanced by the fact that MDI has made a major effort of late to enhance the OneCAT's endurance. Unfortunately, it has done so by sacrificing the engine's zero-emissions status. A burner has been added which heats up the air between tanks and engine, boosting the pressure a bit and so ekeing out the supplies. This burner can apparently be fuelled by small amounts of almost any liquid fuel; and when running in this hotter-air mode, Negre claims 800km range on a pressure charge.

All in all, there seems no real reason to think that Negre will really meet this delivery forecast any more than he has met any of his previous ones. Some speculative money from Tata doesn't really seem likely to suddenly whip the air car into shape.

But let's assume it's really true this time, and the hot-air car isn't just a lot of hot air.

"The first buyers will be people who care about the environment," according to Negre.

Well, maybe. Compressed air, like so many alternative-motoring technologies, doesn't solve the issue of generating power without carbon emissions - especially given the need for burner boost. The air car, like an electric or hydrogen vehicle, merely moves the power generation offboard and into a stationary infrastructure.

In France, to be sure, you can use grid power which comes mostly from nuclear generators and thus is nearly carbon-free. But an awful lot of people who see themselves as caring about the environment will have nothing to do with nuclear power.

Away from France or Switzerland, the air car would be essentially a very inefficient fossil-fuelled one; wasting energy unnecessarily in electricity generation/transmission in all likelihood and at the compressor for certain. It would make more sense in terms of carbon emissions to just burn the fossil fuel on board in a conventional small car: you'd use less overall.

So the hot-air car isn't just unlikely to succeed, it also seems fairly pointless in most markets and strictly limited-appeal even in France. But in some future world where grid energy is cheap and clean - and the air car's specs are reality - it might carve a niche. Assuming that hydrogen, fast-charge batteries, or onboard carbon capture don't work out, anyway.®

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