The hydroplane races at Seafair were not much of a focus for me although I have posted some images of qualifying runs.  However, one of the boats really caught my ear when it was out on the course.  The noise it made led me to think it might be an older boat powered by an old aero engine.  Looking at the images I got of it, that would seem to be the case as the front of the hull seems to be dominated by a large engine.  Don’t know what type it is and maybe some of you are familiar with these boats generally or this boat specifically.  Was it a competitor or was it out as a historic boat as part of the event?