By God Turnbull, you're right, there it is....right in the Geringhoff sales brochure on page 5 which was probably done without prejudice, completely composed by Geringhoff with tests done by Geringhoff. The graph clealy shows the increase in speed labelled in mph  on the X axis with a clear increase in hp demand on the Y axis, however with no label....just an increase. Not sure if it's 1 or 10 or 100. I'm guessing it was just an oversight to not put the label on the Y axis. That's the exact information I was looking for. Now I know how much hp it takes to run each brand of head.