I finally finished the display fixture for the supercharger impellers and installed it in the museum today. I used the impellers as a reason to write some basic information about supercharging for our museum visitors. The impeller display is part of our overall DB-601 engine display. Since the knowledgeable and helpful members of this forum have contributed al lot of information to the 601 display, I thought you you might like to see what all this looks like now. 2 pictures are attached; one of the new impeller display, and one of the whole 601 engine display. Note that, unlike other museums, our visitors can walk right up to and touch a lot of our artifacts, and even pick some of them up, if they so desire. Thanks again to all of you who have helped me.