Re: Canadair CL-41R project
According to Pickler/Milberry, there were 28 unbuilt CL-41 variants. Unfortunately no details are listed. However, there are a few hints in designations and powerplants.
Since the Tebuan was a CL-41G-5, obviously at least four other CL-41Gs were planned. Flight reports that a CL-41G model was Canadair's specific proposal for Joint RAAF-RNZAAF trainer. Engine options give futher hints to planned variants.
Initial CL-41 planning was for the AS Viper engine (presumably the ASV.10 since a Viper 5 wouldn't have enough thrust). Among engine options, Flight says that "Production versions, the company state, can be supplied with either the Fairchild J83, General Electric J85, Pratt and Whitney JT-12 or Armstrong Siddeley Viper, and a version of the Rolls-Royce RB.108 has also been proposed."
http://www.flightglobal.com/pdfarchive/view/1958/1958-1-%20-%200262.html
Flight even stated erroneously that the two CL-41 prototypes would fly with Fairchild J83s (speculating that Orenda would build the J83s if that engine was chosen by the RCAF).
Flight mentions other engine options: "Production versions, the company state, can be supplied with either the Fairchild J83, General Electric J85, Pratt and Whitney JT-12 or Armstrong Siddeley Viper, and a version of the Rolls-Royce RB.108 has also been proposed."
http://www.flightglobal.com/pdfarchive/view/1958/1958-1-%20-%200262.html