That's the one Graeme
The Mooney 301 which as a result of the financial state of Mooney never went beyond the prototype stage. Eventually the design underwent a transformation, got a turborprop engine and became the TBM-700. One wonders what might have been had Mooney had the resources and finances to develop it themselves?
Sorry Trevor, Graeme got there first. However he has declared OH so I'm sure he won't mind if I hand control over to you.