<P> K'Airmobiles vehicles were intended to be commercialized from a project developed in France in 2006 - 2007 by a small group of researchers . However, the project has not been able to gather the necessary funds . </P> <P> People should note that, meantime, the team has recognized the physical impossibility to use on - board stored compressed air due to its poor energy capacity and the thermal losses resulting from the expansion of the gas . </P> <P> These days, using the patent pending' K'Air Generator', converted to work as a compressed - gas motor, the project should be launched in 2010, thanks to a North American group of investors, but for the purpose of developing first a green energy power system . </P> <P> In the original Nègre air engine, one piston compresses air from the atmosphere to mix with the stored compressed air (which will cool drastically as it expands). This mixture drives the second piston, providing the actual engine power . MDI's engine works with constant torque, and the only way to change the torque to the wheels is to use a pulley transmission of constant variation, losing some efficiency . When vehicle is stopped, MDI's engine had to be on and working, losing energy . In 2001 - 2004 MDI switched to a design similar to that described in Regusci's patents (see below), which date back to 1990 . </P>

The highest power output of a pneumatic motor occurs when its speed is