One place to check would be UTC Aircraft Systems; try their public relations office. A second would be New England Air Museum. It's not far from UTC Aircraft Systems' office/plant in Windsor Locks, and many of the volunteers are probably HSD retirees and have contacts within the company. When I worked at Hamilton Standard (I was laid off in 1993, after about 90% of the new-product business for commercial propellers went away), we were still supporting the propellers for the radial-engined DC-3.