Science Fiction
Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Latest By
Category:
Armor
Artificial
Intelligence
Biology
Clothing
Communication
Computers
Culture
Data Storage
Displays
Engineering
Entertainment
Food
Input Devices
Lifestyle
Living Space
Manufacturing
Material
Media
Medical
Miscellaneous
Robotics
Security
Space Tech
Spacecraft
Surveillance
Transportation
Travel
Vehicle
Virtual
Person
Warfare
Weapon
Work
"At its best, SF is the medium in which our miserable certainty that tomorrow will be different from today in ways we can't predict, can be transmuted to a sense of excitement and anticipation, occasionally evolving into awe."
- John Brunner
 |
| Skew-Flip Turnover | ||
| Used halfway to the destination by torch ships to slow for one's destination. |
Heinlein is the first one to describe it as a "skew-flip", but he's not the first one to describe the maneuver.
| But right now ! think we had better hang on. We ought to be at half way point in a few minutes and a skew-flip is disconcerting even if you are strapped down.
I had read about skew-flip turnovers, but only as a theoretical maneuver; I had never heard of a ship that could do one. If this was a ship. The floor felt as solid as concrete and as motionless. I dont see anything to hang on to. |
| Technovelgy from Have Space Suit - Will Travel,
by Robert Heinlein. Published by Scribners in 1958 Additional resources -
|
The novel was published in pieces in F & SF; here's a bit more from the second installment:
Was Pluto in opposition? Or quadrature? Or conjunction? Nobody looks at Pluto so why remember where it is on the ecliptic? Oh, well, the average distance was 30 A.U.s that would give a close-enough answer.
Half that distance, in feet, is: 1/2 ื 30 ื 93,000,000 ื 5280. Eight gravities is: 8 ื 32.2 ft./sec./sec. speed increases by 258 feet per second every second up to skew-flip and decreases just as fast thereafter.
So 1/2 ื 30 ื 93,000,000 ื 5280 = 1/2 ื 8 ื 32.2 x t2 and you wind up with the time for half the trip, in seconds. Double that for full trip. Divide by 3600 to get hours; divide by 24 and you have days. On a slide rule such a problem takes forty seconds, most of it to get your decimal point correct. It's as easy as computing sales tax.
Compare to negative acceleration from Skylark of Space (1928) by E.E. 'Doc' Smith and turnover from Off the Beam (1944) by George O. Smith.
It's a two-piece problem; accelerate for half time (and half distance); do a skew-flip and decelerate the other half time (and distance). You can't use the whole distance in the equation, as "time" appears as a square it's a parabolic.
Comment/Join this discussion ( 0 ) | RSS/XML | Blog This |
Additional
resources:
More Ideas
and Technology from Have Space Suit - Will Travel
More Ideas
and Technology by Robert Heinlein
Tech news articles related to Have Space Suit - Will Travel
Tech news articles related to works by Robert Heinlein
| SETI Suggests Prospecting The Solar System Without Landing |
| Cislunar Space And The Space Lanes of Golden Age Science Fiction |
| NASA Moonbase Update |
| The Solar Oberth Slingshot |
Want to Contribute an
Item?
It's easy:
Get the name of the item, a
quote, the book's name and the author's name, and Add
it here.
| <Previous | Next> |
|
|
|
Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Science Fiction Invention Timeline, or see what's New.
|
Science Fiction
Timeline
1600-1899
1900-1939
1940's 1950's
1960's 1970's
1980's 1990's
2000's 2010's
'Space-sickness is one of the most unpleasant sensations that a human being can experience. Not all are subject to it...'
'...I saw a nice black heavy-looking cloud sailing by just now, and I can get the electrical machine out in five minutes to draw it down.'
'From a distance it could resolve the cosmic rays reflected from various substances.'
'The answer to the dumb student's prayer.'
'He had travelled the space-lanes of the solar system for the greater part of his life...'
'The dinner was excellent. It was completely vegetarian grown in specially prepared gardens in this Moon base...'
'Telepaths had their sensitiveness enlarged to an immense range by the pin-sets, which were telepathic amplifiers adapted to the mammal mind.'
'It was a relief to enter one of the comfortable autos, whisper a direction down the tube, and just know that you would be taken to your destination in the quickest, safest, and cheapest manner.'
'But he didn't get very far with it before another noise in his ear radio scattered his thoughts. George winced...'
