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T. Rex Quicker Than David Beckham

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… we all knew it: David isn’t that fast. He is just sexy…

T. rex may have struggled to chase down speeding vehicles as the movie Jurassic Park would have us believe but the world’s most fearsome carnivore was certainly no slouch, new research out suggests


Still image from a movie comparing each animal’s speed and running style. (Credit: Image courtesy of University of Manchester)

The University of Manchester study used a powerful supercomputer to calculate the running speeds of five meat-eating dinosaurs that varied in size from a 3kg Compsognathus to a six-tonne Tyrannosaurus.

The study — believed to be the most accurate ever produced — puts the T. rex at speeds of up to 18mph, fractionally quicker than a sportsman such as a professional soccer player.

The bipedal Compsognathus, by comparison, could reach speeds of almost 40mph — that’s 5mph faster than the computer’s estimate for the fastest living animal on two legs, the ostrich.

The team — headed by biomechanics expert Bill Sellers and palaeontologist Phil Manning — say the accuracy of their results is due to the computer’s ability to use data relating directly to each dinosaur.

“Previous research has relied on data from extant bipedal models to provide clues as to how fast dinosaurs could run,” said Dr Sellers, who is based in Manchester’s Faculty of Life Sciences.

“Such calculations can accurately predict the top speed of a six-tonne chicken but dinosaurs are not built like chickens and nor do they run like them.

“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.”

Despite its powerful memory and 256 processors the computer still 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 the optimum gait and posture.

The first data to be fed into the computer were those of a 70kg human with the muscle and bone structure of a professional sportsman. The computer accurately predicted a top running speed of just under the 8 metres per second of T. rex.

Musculoskeletal details of a 30kg South American emu and a 65kg ostrich were fed into the program next and top running speeds of 13m/s (about 30mph) and 15m/s (35mph) were calculated respectively.

The process was then repeated using the musculoskeletal data of five bipedal meat-eating dinosaurs — a 3kg Compsognathus, a 20kg Velociraptor, a 430kg Dilophosaurus, a 1.4 tonne Allosaurus and the 6 tonne Tyrannosaurus.

“The figures we have produced are the best estimate to date as to how fast these prehistoric animals could run,” said collaborator Dr Manning, a lecturer in palaeontology in the School of Earth, Atmospheric and Environmental Sciences.

“Since the movie Jurassic Park, scientists have questioned the speed of these dinosaurs and some have wondered whether Tyrannosaurus could have run at all.

“Our research, which used the minimum leg-muscle mass T. rex required for movement, suggests that while not incredibly fast, this carnivore was certainly capable of running and would have little difficulty in chasing down footballer David Beckham for instance.”

 

Proceedings of The Royal Society B

ISSN: 0962-8452 (Paper) 1471-2954 (Online)

DOI 10.1098/rspb.2007.0846

 

Estimating dinosaur maximum running speeds using evolutionary robotics

William Irvin Sellers1, Phillip Lars Manning2

1Lecturer in Integrative Vertebrate Biology, Faculty of Life Sciences, University of Manchester, Jackson’s Mill, PO Box 88, Sackville Street, Manchester M60 1QD, UK
2Lecturer in Palaeontology, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK

Abstract

Maximum running speed is an important locomotor parameter for many animals—predators as well as prey—and is thus of interest to palaeobiologists wishing to reconstruct the behavioural ecology of extinct species. A variety of approaches have been tried in the past including anatomical comparisons, bone scaling and strength, safety factors and ground reaction force analyses. However, these approaches are all indirect and an alternative approach is to create a musculoskeletal model of the animal and see how fast it can run. The major advantage of this approach is that all assumptions about the animal’s morphology and physiology are directly addressed, whereas the exact same assumptions are hidden in the indirect approaches. In this paper, we present simple musculoskeletal models of three extant and five extinct bipedal species. The models predict top speed in the extant species with reasonably good agreement with accepted values, so we conclude that the values presented for the five extinct species are reasonable predictions given the modelling assumptions made. Improved musculoskeletal models and better estimates of soft tissue parameters will produce more accurate values. Limited sensitivity analysis is performed on key muscle parameters but there is considerable scope for extending this in the future.

Written by huehueteotl

August 24, 2007 at 11:11 am

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