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Your imagination has been captured by the roaring rockets from Heinlein's SPACE CADET or the Polaris from TOM CORBETT, SPACE CADET. But are such rockets possible? How does one go about defining the performance of these atomic-powered cruisers?
This document gives some hints and equations that will allow back-of-the-envelope calculations on such matters. Though horribly simplistic, they are far better than just making up your figures.
This site was mainly intended for science fiction authors who wanted a little scientific accuracy (Matthew Lineberger is the first SF author who wrote a novel inspired by this website). But anybody who is interested can play with the toys contained within, designing their own Planet Rangers Rocketships. It is assumed that the reader has enough knowledge to know the difference between a star and a planet, high school mathematics, and enough skill to use a pocket calculator. Computer spreadsheet and computer programming skills are a plus, spreadsheets in particular will make your life much easier.
The engine and the
torchship pages explain how easily do some of the calculations
using Nomograms. PDF versions of the nomograms can be downloaded from those pages, or
printed versions can be purchased from
While this site originally focused on rocketry equations, as you can see it has grown to encompass other topics of interest to SF authors and game designers.
And don't miss the sister website on the topic of making 3D star charts.
These pages are updated sporadically as I stumble over new information. Reload early and often. There is a rough list of the latest changes in the What's New section.
About the title image: the image was created by the author, using the astonishingly powerful open-source program Blender. The author crafted the mesh using blueprints of the Polaris from the Spaceship Handbook. The NERVA solid-core nuclear thermal rocket was created using reference images of NASA mock-ups. The green equations are from other pages in this website. The background image of Earth is courtesy of NASA. There is a larger version of the image here.
For dramatic effect I made the exhaust a blaze of blue. In reality, a hot hydrogen blast is invisible.
Author and webmaster: