The Brackested Term is (SL/1.8)*h

The equation can be explained as follows:

The original Equation by Alexander, Langmann, and Jayes (1977) suggested for use in cantering or galloping animals

SL/h = 1.8*(u^2 / g*h)^0.39

(with u = Speed)

In Mammals SL/h is about 2.0 in the transition from walking to trotting and about 2.9 in transition from trotting to galloping.

According to Thulborn & Wade (1984) your use of

(1) V=[gh(SL/1.8h)^2.56]^0.5)

this Version instead of

(2) V = 0.25*g^0.5*SL^1.67*h^-1.17

(were in your case SL/h is 2.53/1.36 is 1.86) shows how important it is to use the the right equation. With Equation (1) the animal is about 30 km/h fast, with equation (2) it's a more moderate speed of 9.27 km/h

More recently there were studies that showed an even wider range of “hip height to foot length” ratios (e.g. This poster: http://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0CDsQFjAD&url=http%3A%2F%2Fphobos.ramapo.edu%2F~erainfor%2Fpubs%2FManzellaECSCposter.pdf&ei=FylIVKSRHImCzAPevYC4Bg&usg=AFQjCNEFpOhqyIPn5jajrLvVZ-g-wxEU5w&bvm=bv.77880786,d.bGQ&cad=rja).

Even more fundamental critique derives from the difference in limb kinematics between dinosaurs and mammals (which were ultimately used by Alexander to derive his equation). (I remember a talk about this by Heinrich Mallison at Symposion about sauropod giantism at the centenary meting of the Paläontologische Gesellschaft in 2012, but all I could find on a fast search in the internet is the direct predecessor of the talk I remember; a talk at the SVP meeting in November 2011: http://dinosaurpalaeo.wordpress.com/2011/11/10/my-svp-talk-fast-forward-dinosaurs-part-1/)

P.S.: I hope I made no typo in the equations

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