I'm currently reading the wonderful book The Dinosaurs Rediscovered by Michael J. Benton. It contains the formula
$$v = 0.25 * g^{0.5} * SL^{1.67} * h^{-1.17}$$
where $v$ denotes velocity, $SL$ is stride length in $m$, $h$ is hip height in $m$ and $g$ is the gravity of earth. Not being a biologist (in fact not being really familiar with any natural science), I don't quite understand why gravity appears in this formula. I can't imagine this would hold in any meaningful way in circumstances where gravity where different from earth's, so why not simply express the term $0.25 * g^{0.5}$ as $0.78 m^{0.5}/s$, which I assume stems from some fitting of terms to observed speeds given stride length and hip height.