LONDON - The Tyrannosaurus rex would have been able to outrun soccer star David Beckham, according to research published Wednesday by the Royal Society scientific academy.
Experts had argued previously that the 18-foot-tall T. rex's bulk would have meant it was a slow-moving scavenger, but new calculations using a supercomputer suggest the T. rex could run nearly 29 km/h.
Scientists from the University of Manchester calculated the running speeds of five meat-eating dinosaurs that varied in size from a 6.6-pound Compsognathus to the 6.6-ton T. rex.
The fastest of the group was the Compsognathus, which could reach a top speed of 64 km/h-- 8 km/h faster than the estimate for the fastest living animal on two legs, the ostrich, according to the study.
The Velociraptor, a 44-pound killer whose speed was a focus in the action movie "Jurassic Park," could run 39 km/h, the team estimated.
"Our research involved feeding information about the skeletal and muscular structure of the dinosaurs directly into the supercomputer so it could work out how the animals were best able to move," said Bill Sellers, a biomechanics expert who was one of the study's authors.
Previous calculations relied on information from living two-legged creatures to estimate how fast dinosaurs could run, he said. "Such calculations can accurately predict the top speed of a 6-ton chicken, but dinosaurs are not built like chickens and nor do they run like them."
The computer took up to a week to learn the biomechanics of each animal -- starting with the first clumsy steps and developing into a top running speed based on optimum gait and posture, said Sellers, who along with paleontologist Phil Manning led the research team.
The computer accurately predicted a 155-pound human with the muscle and bone structure of a professional athlete could reach a top running speed of 28 km/h, just under the T. rex's estimated top speed of 29 km.h.
To further test the methodology, the computer also calculated that a 66-pound South American emu and a 143-pound ostrich could reach speeds near 48 km/h and 56 km/h, respectively.
Other dinosaurs studied included a 950-pound Dilophosaurus, which the computer said could run 34 km/h, and a 1.5-ton Allosaurus, which was put at 38 km/h.
