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The Fairchild (Ranger) page that provides information on the XV-920 and XH-1850 is now on the AEHS web site (near the bottom). I wish there was more, but this seems to be just about everything that is available.
No, I was not aware of that, but am glad you mentioned it. It turns out I had images of that engine, which are now on the Fairchild (Ranger) page.kmccutcheon,
Thank you very much for the Ranger information. You probably know that an XH-1850-2 is in the NASM collection, so it made it at least to the prototype stage.