American AI is usually American Airlines, and usually appears because of a baggage fee paid at the airport, or a purchase made during a flight. posted 09/11/2012 Helpful (4)
Electric motors are in general, a lot more efficient that internal combustion engines. An average combustion engine has about 18â20%. A formula one engine, has about 50% of an efficiency.
1 For equivalent performance stepping motors are cheaper. 2  Stepping motors are brushless motors so have longer lifetimes. 3  Being digital motors they can be positioned accurately without hunting or overshoot.  Drive modules are not linear amplifiers which means less heat sinks, higher efficiency, greater reliability.