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Modeling Gravity

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Basics of Modeling Gravity

In 1952, Collier's Magazine explored the possibility of long term space colonies living in rotating habitats. How

close are space colonies today, forty years later? The Russians have survived in space for one (1) year without any

gravity, why do we need a rotating craft? Many studies have established that zero "G" allows bone decalcification,

muscle deterioration and a number of other physical detriments that must be chemically and

physically corrected. After one or two years of Zero "G", we will send our astronauts to a hostile environment with

a 100 pound or more life support system on their backs and expect them to function at peak performance. If

humans are planing to colonize space we must find suitable methods of replacing the gravitational effects of earth.

Numerous books and articles have established that 0.5 to 1 "G" is sufficient to maintain health, but more testing

has to be done. What trade-off are we facing? The rotation can be about 6 RPM (revolutions per minute) or less.

This is complicated by the Coriolis effect. (see insert equations) (see graph also) (centroidal control?).

Nomenclature and graphs. Centripetal force is the force applied to a body to keep it rotating about a central point.

One example of this is an orbiting object. Centrifugal force is the reaction of the contents of. an object experiencing

a centripetal force. (a centrifugal force acts opposite to a centripetal force). Coriolis effect is a force experienced

by a change in rotational radius without changing velocity. What will it be like? The minimum surface per person is

.... sq.ft.(80 sq.M) per person and the minimum volume is .... cu.ft.(240 cu.M) per person. these numbers can

change .... sq.ft.(157 sq.M) and .... cu.ft.(1740 cu.M) if recycling is added. How Many People are required and how

does this effect the mission? The current non-rotating space craft designs show modules that are slightly bigger

than a bus and smaller than a passenger train. (shape factors, provide table or graphs.). How can I experience it

without actually being there? Space construction is like building a house while standing on a wagon. Try to eat while

hanging upside down, it's a new experience. Gravity is often taken for granted in the world today. Thrust vs. gear

or single habitat. accelerating effects (resultant drawing comparison.). Can anything be done today? (earth bound


Additional reading:.

"Go Forth and Multiply" by Lance Frazer; .

Ad Astra Mag. Jun. 1989.

Space Resources and Space Settlements"

by Gerard K. O'Neill NASA SP-428 1979

"Living Aloft" by Connors, Harrison & Akins;

NASA SP-483 1985

"An Overview of Artificial Gravity" by Ralph W. Stone

jr.; NASA SP-314 1973

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Standard Handbook Of Engineering Calculations, Second Edition

Published by McGraw Hill, Edited by Tyler G. Hicks, P.E., 1972,

ISBN 0-07-028735-X Pages 8.12 to 8.18

Marks' Standard Handbook for Mechanical Engineers, Ninth Edition

Published by McGraw Hill, Edited by Eugene A. Avallone & Theodore Baumeister III, 1987,

ISBN 0-07-004127-X

Section 11.5, Page 11-95 to 11-97, Rockets

Section 11.6 Astronautics,

Introduction To Flight, Third Edition

Published by McGraw Hill, Written by John D. Anderson, Jr., 1989,

Home References History Rockets Craft Planets Orbits Aliens Future Support Time

People Atmosphere HVAC Water Food Waste Power Gravity Biosphere