[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
RE: New Tyrannosaurus paper
> From: email@example.com [mailto:firstname.lastname@example.org]On Behalf Of
> Demetrios M Vital
> Second question: how does one measure the hip height of a T.rex,
> and how on
> earth does one measure the stride of a T. rex?
Hip height for striding vertebrates is most often calculated as "femur
length + tibiotarsus length + metatarsus length". However, one could also
estimate an "instantaneous hip height" by creating a mount (or virtual
mount), and measure the vertical distance from the center of the acetabulum
to the ground.
As for stride length: see ANY paper or textbook that covers dinosaur
trackways for how these are measured (linear distance from a given footfall
to the next fall of the same foot). One can "back-calculate" stride length
for an animal of a given height moving at a given speed by modifications of
locomotion equations worked out by Alexander, Farlow, and various others.
> Third question: what does Hutchinson's paper imply for T. rex stamina? If
> it was just walking, then couldn't T. rex, or any large theropod, go for
> quite a while?
They do not address stamina here.
> Fourth (and last) question: the "Groucho walk" was seen as a way
> for bipeds
> like T. rex to increase their speed without running, so how do ideas like
> this fit in with the new biomechanical work and Hutchinson's paper?
> Demetrios Vital
> P.S. How come the T. rex didn't trip when it RAN INTO A FALLEN TREE in
> "Jurassic Park?"
Because it was only a digital image, and so had no mass upon which gravity
could react... :-)
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Phone: 301-405-4084 Email: email@example.com
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796