In a message dated 1/10/99 3:46:11 AM Mountain Standard Time, tesla-at-pupman-dot-com writes: > From: Mike > K = 0.100976*(H/D) + 0.309630 > If you want K for the entire series including (H/D) less than two, it > becomes a forth order equation. > K = 0.0005x^4 - 0.0097x^3 + 0.0648x^2 - 0.0757x + 0.4723 > I see that I had a brain fart on the second one. "x" should be H/D.