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Dale Armstrong built the original Top Fuel dyno that, with several changes, now resides at Bill Miller Engineering (BME) in Carson City, Nevada. The absorber was originally designed for testing huge radial aircraft engines during WWII. The dyno uses a 4:1 step-down gearbox to reduce these 8,000-rpm engines to a maximum 2,000 rpm input into the absorber. BME now uses alcohol engines on the dyno to help develop new components for the Top Fuel Gibson/Miller supercharger.