What was the approximate thermal efficiency of the engine developed by Etienne Lenoir?
Answer
4 percent
The Lenoir engine was characterized by its relative simplicity, which made it reliable enough to sell, but it came at a significant cost to performance. It was notoriously inefficient, successfully converting only a tiny fraction of the fuel's potential energy into actual mechanical work. While this level of efficiency was sufficient for low-power industrial tasks during that era, it clearly demonstrated that the engine design was not yet optimized for heavy-duty or long-distance transport applications.
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