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02 Pursuit motorcycle runs on compressed air
A vehicle that runs on air. It sounds like a fantastic idea, but energy is still needed to compress the air and the losses that go hand-in-hand with converting energy still have to be taken into account, just as in fossil fuel-based propulsion systems. Pros and cons aside, we still haven't seen air powered transport make an impact in the race to find economic, environmentally-friendly ways to get from A to B. Industrial Design student Dean Benstead thinks that compressed air does have a role to play in the future transport mix, and he's designed a working air-powered motorcycle prototype with a view to exploring the viability of the platform.
Benstead's "02 Pursuit" motorcycle is based on the geometry of a current-spec 250 cc motocross bike and uses running gear from a WR250F and Engineair's DiPietro air engine as its power plant.

In its current form it can hit speeds in excess of 62 mph (100 km/h) and, given that the first prototype was developed with a focus on design rather than engineering, Benstead believes that performance can be improved with further development.
"The concept evolved from research to sketches to computer modeling before the chassis and bodywork was built and fabrication at local manufacturer, Rinlatech Engineering, began," says Benstead.
"I wanted to explore the viability of compressed air as an alternative fuel, and my childhood experiences riding dirt bikes led me to design the motocross bike based around the Engineair engine."

http://www.gizmag.com/compress ... cle/20354/picture/146332/
You'd need a unlikely large amount of pressure to get any useful range on this.

I think that sums up the idea in one sentence

Edit: Compressed air at 300 bar has a specific energy (potential) of around 0.5 MJ/kg. Gasoline has 46 MJ/kg.
Quote from RasmusL :You'd need a unlikely large amount of pressure to get any useful range on this.

I think that sums up the idea in one sentence

Edit: Compressed air at 300 bar has a specific energy (potential) of around 0.5 MJ/kg. Gasoline has 46 MJ/kg.

Not a problem, NASA will put these on Ebay any day now...
Attached images
airtank.jpg
Very funny. Mock if you like but on a tank mounted to the bikes frame it can be ridden 100+ miles.
Quote :According to VitalMX.com, he can ride around for 3 hours at 60kph on a tank of air.

That said these must have been from an efficiency test @ constant speed. So for normal everyday use you could probably expect a 50 mile range. I think compressed air transportation has a future. (even if a silent bike is seen as a bit boring)
The perfect solution for Beijing.
That simply isn't thermodynamically possible. Either he's lying or he has an insane (read: impossible) amount of pressure in there.

FGED GREDG RDFGDR GSFDG