I found this. They are only predicting Mach 0.82 but still pretty fast for a prop plane:
http://www.popsci.com/popsci/aviatio...cbccdrcrd.html
Quote:
PROPELLER WITH PUNCH
Renaissance Research claims its Dart Racer might someday give the Lear Jet a run for its money. The corporate jet has long been the ultimate status symbol, but Renaissance Research is out to challenge jet-powered primacy. The California-based company is bent on designing the fastest propeller plane in history and, ultimately, on producing an alternative to today's midsize jets.
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