On Jun 19, 2020, at 12:34 PM, Jon Finley <jd@...> wrote:

Yes indeed, that is a radiator.  Here's a photo of the ducting for it that was in the tailcone.

Now that I'm looking at this stuff again, I'm starting to understand why people looked at me kinda strange, shook their head, and walked away!! :-)

Jon Finley
Somewhere in the Southwest flying an RV-4 <314JF_RadiatorDuct.jpg>