What is Sf: Definition and 42 Discussions

The SIAI-Marchetti SF.260 (now Leonardo SF-260) is an Italian light aircraft which has been commonly marketed as a military trainer and aerobatics aircraft.
The SF.260 was designed by Italian aircraft designer Stelio Frati, while production work originally performed by Milan-based aviation manufacturer Aviamilano. On 15 July 1964, the first prototype performed its maiden flight (then designated F.260). Shortly thereafter, responsibility for production was transferred to SIAI Marchetti, who had purchased the rights to the design; manufacturing continued to be performed by this firm until the company was bought by Aermacchi in 1997.
The SF.260 has been largely sold to military customers as a trainer and light combat aircraft. In addition, there have been limited civil sales to private operators; during the late 1960s, the type was marketed in the United States under the name Waco Meteor. Armed military versions, sold as the SF.260W Warrior, proved to be popular with smaller air forces, which could arm the type for use in the close air support role. Both piston-powered and turboprop-powered models have been developed.

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  1. DennisN

    3 Body Problem (upcoming TV series)

    I just saw this trailer and got a bit excited :smile:. It is an upcoming tv series based on a novel I had never heard about, and I have no idea about the plot. But there is some Contact feeling in it, and it also seems there is a voiceover of Carl Sagan in the trailer. According to the trailer...
  2. Dr Wu

    Some SF Thoughts on Videotelephony?

    Having read a fair bit of SF down the years, and now pondering the likely future direction(s) of the smartphone, I do wonder about the practicalities of the oft-cited videophone. Yes, the advantages are clear in domestic settings; that's to say using fixed screens on to which relay video images...
  3. G

    Exploring Military SF: Realistic Energy Shields

    I am writing a military SF, and wonder, what could be the most realistic things, that are close to the old SF concept of energy shields. So far, i wrote that a small mecha uses a handheld plasma shield against an incoming missile. Like explosive reactive armor, it meant to shatter the...
  4. BWV

    What Are the Top Sci-Fi Books of the 21st Century?

    Trolling for more reading material, my list: Alastair Reynolds: Pushing Ice, House of Suns Neal Stephenson: Seveneves Peter Hamilton: Commonwealth Saga Cixin Liu: Three Body Problem
  5. DennisN

    Video: SF ships/structures size comparison

    Here's a nice video which is a size comparion of a great number of fictional structures from science fiction novels, movies and games. The video is called "FICTIONAL STARSHIPS Size COMPARISON" but it includes some structures I personally wouldn't call starships, but anyway... Enjoy...
  6. G

    SF code cracking vs real mathematics

    After i read about RSA encoding, it looks like as if one need an alternate history universe to justify that in the not so far (cyberpunk) future the coded message of an important person involved in shady business can be cracked in reasonable time, let alone during a single night. I read that...
  7. G

    Exploring the Plausibility of SF Energy Shield Alternatives

    What could be the things closest to a SF energy shield? Even the strongest known materials couldn't stop shrapnels hit with 100 km/s. On the other hand, whipple shields are pretty efficient against high speed/low mass threats, the first armor plating disperse the micrometeor, then the second...
  8. DennisN

    VOTE PF Favorite Movies Poll 2 - SF, Fantasy, Comedy & Western

    Hi, and welcome to the Physics Forums favorite movies poll 2! (the first poll is here) Rules and notes: Please vote here for your 5 favorite movies in the categories Science Fiction, Fantasy, Comedy & Western. Please note that this is a multiple votes poll, and that your votes should reflect...
  9. Y

    Anyone in the SF Bay Area into audiophile and/or building amps etc.?

    Hi I live in the Santa Clara bay area in the Silicon Valley, I want to see anyone here that are living close by that are into high end audiophile stuffs particular designing and building audio electronics. It's hard to find anyone that is into this, it would be nice to find people to share this...
  10. BWV

    Is is just me, or is FTL dead in SF?

    Grew up reading Larry Niven and a host of other legit SF writers that all incorporated some form of FTL travel in their books, then Alistair Reynolds came along and wrote even more interesting interstellar SF without any violations of relativity, now that seems to be a trend. Anyone know of...
  11. Howie BL

    Need help crafting a cataclysm (for SF novel)

    Hello I'm in the process of writing a novel and there is one specific event that I need help nailing down. The story is very much fantasy / science fiction, so reality is no barrier, however I want to stay as true as possible to laws of physics. Skipping background details, imagine a mini...
  12. C

    Programs SF Bay Area night/part time undergrad physics programs?

    Does anyone know of any night B.S. Physics programs in the SF Bay Area? I can't switch jobs or stop working full time. I don't have the luxury to go back to school full time, nor extra financial support. I want to go back to school for a completely different career path. I currently have a...
  13. Svein

    Hard Physics SF: The Three-Body problem

    .. and done by a Chinese author: Liu Cixin. Here are some reviews: https://www.goodreads.com/book/show/20518872-the-three-body-problem. So: What do you know about the general three-body problem and would you like a story set in a solar system with three suns?
  14. G

    Any SF that foresaw the present?

    I wondered, whether anyone in the past had written a story, that gave at least a good approximation of our present?
  15. DennisN

    Star Wars Episode VIII – The Last Jedi (upcoming)

    Ok, the next Star Wars, Episode 8, is named "The Last Jedi" and here is a brand new teaser, the first I think. "Star Wars: The Last Jedi. Arriving in your galaxy December 15."
  16. G

    Plasma cannons and other SF weapons

    I think about a far future story with a good amount of battles. Futuristic battletech i can imagine would involve things like deploy nanobot clouds that jam and damage sensors and everything vulnerable, powered battle armors of course, drones, probably some meelee solution for bunker combat...
  17. G

    Reality check on SF action scenes

    People are free to post here their ideas and watched scenes involving SF actions, whether they can be realistic or not.
  18. DennisN

    Is Arrival the Next Sci-Fi Blockbuster or Just Another Hollywood Rehash?

    Thought I'd share this in the SF forum... What interests me regarding this movie is that language seems to be an important theme in the story and that the director also directed Sicario, which I liked. Trailer 1: Trailer 2:
  19. EnumaElish

    Aliens as FTL Humans: Scenario from Sci-Fi Novel

    What do you think of the following scenario*? Aliens are future humans who discovered faster than light travel. They propagated throughout the universe. In so doing they traveled back in time, to our time, or even earlier times. *I read this in a popular space opera novel. It may have been...
  20. EnumaElish

    AI made of light "possibly science" or "pure fiction"?

    At the end of the movie about a robot boy who sleeps a long time under water ("AI"? by Spielberg?), sentient beings seemingly made of light appear. That's what I remember anyway. Is that within the possibilities of known science? Can light particles behave as organized matter in and of...
  21. G

    Everyday Life in SF: Exploring Realistic Possibilities

    I think that many SF books and films focus on big battles, or a great discovery, but care less about, how everyday life could change? In a not so near future, (that is fictional, but meant to be rather hard, realistic) could people have a life similar to ours, with all the recent developments...
  22. C

    The correct usage of self driving cars in SF

    Setting: generic, mildly futuristic, nothing that would put you in awe. I rather want to discuss in general terms how get in near future SF correctly usage of self driving cars right with technologies that should realistically accompany them. And get right any social consequences. Thanks to...
  23. G

    Exploring Hard SF Tactics in Space Combat

    I wonder, could they be employed in hard SF, if yes, how? If one intends to capture a planet (example: Mars with a few cities, capital on south pole) the defenders only doomed if big ships can reach low orbit and burn them with lasers. Big surface lasers can easily outpower even the biggest...
  24. G

    Realistic Space Pirates in Hard SF

    A common trope in pop SF. But can they be realistic in a hard SF, no FTL, no hide in space? I have collected a few counterarguments (C:), and my justifications (A:) to overcome them, but i'd like to see other opinions as well, whether my answers has great flaws or not, maybe advices, good...
  25. C

    How to interstellar travel in a very hard SF universe

    While I enjoy space opera (Star Trek, Star Wars, etc) my favorite fictional genre is the rarer hard science fiction, stories that involve science and engineering which doesn’t yet exist, but, unlike soft SF and fantasy, don’t can be rigorously explained as possible by present-day science, making...
  26. C

    Which mildly futuristic devices got omitted in SF settings?

    I'm curious which simple devices in your opinion: - do not violate any law of physics; ;) - seem easy and inexpensive to fabricate; - would be quite practical; - would not shock you if were being produced in next few decades; - but unfortunately are neglected in SF movies/stories/films/games...
  27. H

    Logistics of Lasers as Weapons in SF

    Hello. I just joined this wonderful community, so excuse me if I'm doing something wrong. I'm new to using forums. Anyway, I had a question. SF usually features 'phasers' as weapons, but from what I hear it doesn't sound too realistic. I thought maybe lasers would be better weapons, say if...
  28. R

    Is Writing a Sci-Fi Novel as Challenging as Becoming a Bestseller?

    Firstly, it's darn hard work, and any notion I had about overtaking Crawford's, Lights Out, have been dealt a painful blow. He became a multimillionaire in the time it takes the photons leaving your monitor to pass the end of your nose. Well, so it's said. I talked at length to Richard...
  29. Janus

    Sign the SF writer stamp series petition

    Here's a petition trying to get the USPS to run a stamp series honoring SF/Horror writers, editors and artists. It sure beats the hell out of another series of flowers...
  30. tom.stoer

    Current status of canonical LQG and SF models

    From time to time I try to get an overview regarding the current status of LQG. Unfortunately there seem to be a lot of interesting ideas and new proposals, but I am missing a summary paper which addresses and summarizes both main achievements and main open issues. What about status of...
  31. R

    Einstein's Field Equations - SF Writer needs general answer

    I am working on a novel that uses 'gates' that for lack of space here let’s just call worm holes (any excuse works for this question). But these gates cannot bridge to each other if located in a region of space that is warped too much. So I'm looking for a proportional answer, not a calculated...
  32. F

    Witness 1000 Digits of Pi in the Sky Over SF

    I think it's the first 1000 digits. wish I could have been there https://www.youtube.com/watch?v=4iALEU1dD1A
  33. S

    Soft SF writer wonders: How might a hot chick conjure a traversable wormhole?

    I'm working on a sci-fi / noir / mystery novel for my thesis, and I've endowed my femme fatale heroine with the ability to conjure traversable wormholes. It's important that she be able to do this without the aid of any machine or finite quantity of exotic matter that she would have to...
  34. marcus

    Smolin:GR=EoS of SF, if he's right isn't that the ballgame? :-D

    Smolin makes the case that GR is the Equation of State of a given region's geometry considered as a thermodynamic system whose microscopic degrees of freedom are those of Spin Foam QG. In short: GR=EoS of SF The paper is here: http://arxiv.org/abs/1205.5529 General relativity as the equation...
  35. tom.stoer

    Constraint Algebra & Gupta-Bleuler in LQG & SF Models | W. Wieland

    There's a new paper dealing with constraint algebra and Gupta-Bleuler quantization in LQG and SF models. http://arxiv.org/abs/1012.1738 Complex Ashtekar variables and reality conditions for Holst's action Authors: Wolfgang Wieland (Submitted on 8 Dec 2010) Abstract: From the Holst action...
  36. S

    SF Writer's Speculative question on Space Combat

    I am a sciencefiction writer who specializes in military science fiction. I have a question dealing with the affects of high speed targeting. Take two ships traveling on a recropical course. Each is seeking to target the other with weapons that can accelerate to close to C. Make one going at...
  37. C

    SF Writer in need of assistance - SPACESHIP FUEL

    Hello all - once again! I am an aspiring SF writer currently in the process of writing a book. I am looking for ideas (go nuts!) for different types of spaceship fuels. The idea is that the fuel has to be something that exists in abundance (preferably naturally occurring), and...
  38. H

    Number of sf to be carried forward

    Homework Statement My problem is with the number of significant figures I have to carry forward in intermediate calculations. I know that if the given data has a minimum of n sf, then the final ans should be to n+1 sf. But then should the intermediate answers be to n+2 sf?? Homework...
  39. D

    A lot, 6000 SF. What is the superficial area in meters?

    For some reason I cannot get this.
  40. EnumaElish

    New SF book with Brasil in the title

    New SF book with "Brasil" in the title... ... written by Ian Mc[can't remember full last name]. Was recently reviewed in the NYT Sunday Book Review (this past weekend). Anybody got a clue?
  41. wolram

    LQG, SF: Kicking Tyres, Adding Sawdust, and More

    Is this all that LQG, SF is, kicking tyres and adding saw dust to differentials, putting some pluss gas in your engine, to keep it running, how about giving the buyer some grantee.
  42. Janus

    The Ultimate SF quiz: THE ANSWERS

    Okay, Its been a week since I posted my SF quiz, and it looks like its run its course. So for all of you who are dying to know, here are the answers. For those of you who still wish to play, go to : https://www.physicsforums.com/showthread.php?t=28103 and then come back here to see...