Napier & Son was the most successful British manufacturer of aircraft engines in the 1920s and 30s with their 12-cylinder Napier Lion powering 163 different types of aircraft between 1918 and 1935. Over that 17 year period the Lion grew from 450 to 1350 horsepower and was, for awhile, the most powerful aircraft, boat, and car engine in the world, holding world speed records in all three venues at the same time. And then the Napier Lion was suddenly gone — a lesson from which Microsoft’s Steve Ballmer could benefit if he and his company don’t repeat it.

Napier perfected their Lion engine over those 17 years, improving it in every way until it was the […]