doubleu-anker:
What a great shame the manufacturers and authorities are unable to come up with a realistic test to see how an a/c performs at Vr+ with contaminated wings.
The information and the knowledge regarding this aircraft is widely available. I posted the link to the Canadian TSB's report on the Air Canada CRJ accident at Fredericton, New Brunswick because it addresses this question, in part, in Appendix C of the report and is entitled:
Appendix C -
Computed Versus Expected CL-Alpha Curve
I will not reproduce the graph here as it is under copyright protection but the report is freely available to all at the link provided.