MDI Air Car

A compressed air car is a compressed air vehicle that uses a motor powered by compressed air. The car can be powered solely by air, or combined (as in a hybrid electric vehicle) with gasoline, diesel, ethanol, or an electric plant with regenerative braking.

MDI Website


…and MDI has endeavoured relentlessly to design, develop and create Clean, Ergonomic and Affordable Vehicles and Power Generators. Taking into consideration only the essential and needful features, MDI has formulated an overall philosophy based on technological innovations which have direct impact on global environment. Consequently, MDI has succeeded in developing cutting edge technologies that promote pollution free environment and are inexpensive to manufacture.


…in which MDI has redefined the concept of manufacturing and marketing of vehicles! MDI inventions have brought about simplification of the products by decreasing the mass and reducing the number of components required, resulting in lower manufacturing costs. Even the marketing of vehicles has been revamped in order to keep the cost down. The vehicles are sold directly at the point of manufacture, cutting out all middlemen. This completely eliminates the carbon footprint by avoiding shipment of vehicles from one country to another, thus protecting the environment for the future generation.


… whether it is in the Transportation field, Energy Management field or in Energy Production field, is designed to simplify everyday life and allow the end-users to relax with deep satisfaction that they are making a significant contribution to save the planet!



Unlike petrol or diesel engines, the MDI technology does not use any form of internal combustion. The engine is also reversible and recompresses air into a built-in carbon fibre storage tank. The lightweight engine offers a pathway towards a freedom from fossil fuel reliance.


   One of the most frequently asked questions is about the safety of the compressed air storage tanks. These tanks hold 90 cubic metres of air compressed to 300 bars. Many people ask whether this system is dangerous in case of an accident and if there is a risk of explosion. The answer is NO. Why? Because these are the same tanks used to carry the liquid gas used by buses for public transport. The tanks enjoy the same technology developed to contain natural gas. They are designed and officially approved to carry an explosive product: methane gas.

   In the case of a major accident, where the tanks are ruptured, they would not explode since they are not metal. Instead they would crack, as they are made of carbon fibre. An elongated crack would appear in the tank, without exploding, and the air would simply escape, producing a loud but harmless noise. Of course, since this technology is licenced to transport an inflammable and explosive gas (Natural gas), it is perfectly capable inoffensive and non-flammable air.

   It is fitting, therefore, that MDI has reached an agreement with the European leader in aerospace technology Airbus Industries for the manufacture of the compressed air storage tanks. With a remote supervision arrangement, Airbus Industries oversees the making of the storage tanks at each MDI factory. The coiled carbon fibre technology used in the construction of the tanks is complex and requires a substantial quality control process which the multinational company, home of the Airbus aircraft, will provide for our vehicles.


   The MDI vehicles will be equipped with a range of modern systems. For example, one mechanism stops the engine when the car is stationary (at traffic lights, junctions etc). Another interesting feature is the pneumatic system which recovers about 13% of the power used.


    The MDI car body is built with fibre and injected foam, as are most of the cars on the market today. This technology has two main advantages: cost and weight. Nowadays the use of sheet steel for car bodies is only because of cost - it is cheaper to serially produce sheet steel bodies than fibre ones. However, fibre is safer (it doesn't cut like steel), is easier to repair (it is glued), doesn't rust etc. MDI is currently looking into using composite flax fibre


   The MDI engine works with both air taken from the atmosphere and air pre-compressed in tanks. Air is compressed by the on-board compressor or at service stations equipped with a high-pressure compressor.

   Before compression, the air must be filtered to get rid of any impurities that could damage the engine. Carbon filters are used to eliminate dirt, dust, humidity and other particles which, unfortunately, are found in the air in our cities.

   This represents a true revolution in automobiles - it is the first time that a car has produced minus pollution, i.e. it eliminates’ and reduces existing pollution rather than emitting dirt and harmful gases. The exhaust pipe on the MDI cars produces clean air, which is cold on exit (between -15º and 0º) and is harmless to human life. With this system the air that comes out of the car is cleaner than the air that went in.


   Based on its experience in aeronautics, MDI has put together highly-resistant, yet light, chasses, aluminium rods glued together. Using rods enables us to build a more shock-resistant chassis than regular chasses. Additionally, the rods are glued in the same way as aircraft, allowing quick assembly and a more secure join than with welding. This system helps to reduce manufacture time.


   Guy Nègre, inventor of the MDI Air Car, acquired the patent for an interesting invention for installing electrics in a vehicle. Using a radio transmission system, each electrical component receives signals with a microcontroller. Thus only one cable is needed for the whole car. So, instead of wiring each component (headlights, dashboard lights, lights inside the car, etc), one cable connects all electrical parts in the car. The most obvious advantages are the ease of installation and repair and the removal of the approximately 22 kg of wires no longer necessary. What’s more, the entire system becomes an anti-theft alarm as soon as the key is removed from the car. 



Back to Top