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A_Mysterious_Stranger

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  1. A_Mysterious_Stranger

    Directed Energy Weapons Repository

    Oh sure. That's also why it's like a wiki: as a starting point for research it's great because it can consolidate alot of information into an easy-to-access place. It's just the time needed to sift through it to determine how much of it may or may not be accurate that can be problematic. Some of the info can be a bit dated tho. Some of the Schilling stuff the energy sidearms page you linked to uses is also decades old Usenet posts lol. If you're interested in more of Luke's recent stuff you should look up his game stuff. He improved some of his ideas from the Laser Death Ray site: here's his home page you can access Vergeworlds and his GURPS house rules there. As an attempt to be more informative I'll also post some info for the Solid State Heat Capacity Laser. It's still CW I believe as opposed to pulse lasers (repetitive or otherwise) but it's interesting because it seems to be the closest we've gotten so far to a true 'Luke Campbell' style laser (It's close to his newer 'pulse laser' idea though, which you'll find mentioned on his Vergeworlds/GURPs rules) https://lasers.llnl.gov/science/photon-science/directed-energy/sshcl https://e-reports-ext.llnl.gov/pdf/245418.pdf https://e-reports-ext.llnl.gov/pdf/241387.pdf https://www.researchgate.net/publication/244988141_Solid-State_Laser_High-Energy_Laser https://str.llnl.gov/str/April06/pdfs/04_06.2.pdf
  2. A_Mysterious_Stranger

    Directed Energy Weapons Repository

    Yeah, I thought about Atomic Rockets but was unsure if that would be okay to post. It's a good site but it's like a wiki. It's a dumping ground for diverse opinions culled from across the internet with little or no peer review. So you have to take it with a grain of salt. The arguments about what qualifies as 'realistic' science fiction suffer from the same problem of trying to predict the future of warfare: We suck at reading future with accuracy, and many people color the matter with their preconceived ideas. If we mention AR, I can mention Luke Campbell's 'How to Build a Laser Death Ray' site. He's one of the most prolific guys on laser weapons (including laser small arms). Much of the work has been for personal (game-related) reasons, but it's been very interesting to read his work and I consider him to be as good as the sources I linked to above because of the depth of research he's done.
  3. So, yeah. I wasn't sure where to put this but @Sturgeon was kind enough to suggest it go in the Ballistics Science forum (months ago, I've been busy with stuff) so this is where it sits. It's not exactly 'ballistics' per se, but its still science-related and relevant and interesting because it's really, really hard to find some good technical documents that isn't science fiction nerd speculation. You can actually find a surprising amount of that stuff on dtic, and I've always had a fascination since I was a kid with the old SDI program (borrowed tons of library books about lasers and particle beams too.) There are, however, a couple really good ones I've discovered, although both are really old. There are lots of other more specialized and 'misc' documents on dtic which I may or may not post in the future depending on time or interest. The first (and more recent) is a book called 'The Effects of Directed Energy Weapons' by Philip E. Nielsen: The Effects of Directed Energy Weapons Oddly it still seems to be in circulation according to Amazon (odd given its up for free on DTIC) which makes you wonder how legit that is but.. eh. The other one is much older (80s, meaning its SDI era) but it's also interesting and detailed because it originated with an AP study group on DEWs as part of the larger SDI effort I believe. And it's quite interesting because it shares similar ideas with EDEW above: Report to the American Physical Soceity of the study group on science and technology of directed energy weapons. So yeah, the biggest and best sources for such I've run across. If I find any more (or if anyone else finds them) they can post them here too in preparation for World War 3 or the Martian Invasion. The last one is more laser-focused, but still about DEWs (it's actually the source that lead me to my second source) and also comes from DTIC: Directed Energy Weapons on the Battlefield: A New Vision for 2025
  4. A_Mysterious_Stranger

    Gun Science Library

    Some random recoil impulse figures. This stuff is interesting/important if you want to deal with guns from the back end rather than the front end, I find. Fire out of Battery Test results - a discussion of soft recoil/Fire Out of Battery recoil mitigation technologies (In the quest to put bigger guns on lighter frames) It provides a number of Ogorkiewicz ratio figures for various armored vehicles (ratio of tank gun recoil impulse to its mass. Rule of thumb is 900 ns/ton as I recall) Here is the list of 105mm 120mm and the Sheridan's 152mm gun: https://imgur.com/a/MtAyVok Designer's Dilemma - recoil, what to do with it? Covers towed/field artillery rater than sPG: 155mm towed gun figures: https://imgur.com/a/7bCBkzm Also a bit on FCS and tank guns, it includes a few interesting tidbits like recoil force and energy comparisons between 120mm and 140mm guns: DOD: DEVELOPING SCIENCE AND TECHNOLOGIES LIST SECTION 9: GROUND COMBAT SYSTEMS TECHNOLOGY It's about 15 years old by now, but its still interesting.
  5. Here are a couple intresting documents. They represent the preoccupation of one guy named Andre Gsponer with future nuclear weapons. What (to me) sets him apart is a vision of compact nuclear weapons - he terms 'fourth generation' in the 1-100 ton yield that fit a niche between existing 'conventional' and tactical/strategic (higher yield) nuclear weapons. I also like Gsponer because he rivals Friedwart Winterberg for obsession in using super explosives to set off nuclear reactions. Fourth Generation Nuclear Weapons: Military effectiveness and collateral effects The physical principles of thermonuclear explosives, inertial confinement fusion, and the quest for fourth generation nuclear weapons This one has an online version if you dislike PDFs. No abstract but I've summarized the first few sentances covering many of the chapters
  6. A_Mysterious_Stranger

    Random Nuclear Stuff

    I know @LostCosmonaut had a thread about radiation thresholds and others have mentioned Nukemap, but I did run across this which may be of interest during one of my attempts to indulge my obsession with 50s era atomic army silliness (Blame Fallout): Casualty Estimation for Nuclear and Radiological Weapons The focus seems mostly on possible terrorist devices, but it mentions tactical stuff too. It goes without saying it's very NATO centric as well.
  7. A_Mysterious_Stranger

    The Body Armor Thread

    Damn, I'll need to re-learn new nomenclature just to sound clever about body armor and terminal ballistics. Still, I'll be interested in seeing what comes of this.
  8. A_Mysterious_Stranger

    50 bmg protection at 4 pounds?

    Well it's UHMWPE so I don't think it's subject to plugging the way a steel plate would be. It's also a lead core rather than something harder which I think affects penetration.. Also there's ballistic limit - stopping a single round of a single type/weight at a given velocity is great, but how repeatable is that fact? Can it stop such a round 50% of the time (v50) or almost every time (V0)? There's also the backface deformation (hard to judge but at least 25-30mm?). And a 4lb plate hit by a 750 grain round moving at 2400 fps is going to impart considerable energy and momentum to the body which isn't likely to be any kinder (ESPECIALLY with the aforementioned backface deformation.) Reminds me of some of the claims you used to hear about Dragon Skin. There was a similar 'test' done for something called Kryon Terminator some years back which also claimed to stop .50 cal (though it was unclear whether that had any relevance to body armor.) It's entirely possible, but with body armor there's always more to it than 'can it stop X round' (again Dragon Skin.)
  9. A_Mysterious_Stranger

    Railguns

    huh I've always meant to post something in this thread but never got around to it. Anyhow, to start I've read that one simple way to visualize how a railgun would work is the Jacob's Ladder: https://www.youtube.com/watch?v=bKD1wsBOo2M Kinda silly I know, but I couldn't resist. Howstuffworks has an explanation as well that I thought was good and may be useful for others: https://science.howstuffworks.com/rail-gun.htm Obviously the armature is a crucial component to railguns (I think of it as combining propellant and sabot though I'm not sure how accurate that is.). But like a sabot, it represents parasitic mass that you want to minimize and other factors. There are approximately four kinds of armatures I am aware of: solid, hybrid, transitioning, and plasma each with their own tradeoffs. A good description of Armatures can be found here along with the impact of various armatures on railgun performance: Efficiency Scaling for Railgun Armatures
  10. Been delayed with stuff but I've wanted to post this. Actually I'm surprised I've never seen anything in detail about this before, because it's an interesting topic. (IF there IS a topic on this I apologize and it can be merged there.) ETC tech is something you probably hear about if you hang out on tank, military or gun forums. Especially if Railguns or coilguns are mentioned. Or 'next step' in gun design like 140-152mm guns. There's lots of information out there if you look and you discover just how diverse it can be. I'm sure most people are aware that Wikipedia has a article on ETC tech and as far as Wiki articles go it's decent. But the person who worked on it in the past also wrote an article on ETC for the Nationstates draft room. It's old but still good. So despite the origins it's still useful (the writer was also a member on Tanknet IIRC. Take that as you will.) In Jane's Technology of Tanks, Ogorkiewicz also commented about ETC: Ogorkiewicz also discusses the concept in Tanks: 100 years of evolution: One realization from this is ET/ETC technology is quite diverse and can be confusing. One of the better sources covering that concerned Rheinmetall research into a German 120-140mm (courtesy of Wayback because the original source fell to link rot): Link to image of Rheinmetall ETC classifcations On the amateur experime which discusses ET/ETC stuff in detail too. If you prefer the more 'hype' side of things, ETC was also tied to the Future Combat Systems - a link some people may recognize: As you can see, ETC is evolutionary not revolutionary like EM guns. It takes existing technology and builds on it: You can settle for improving propellant ignition (minimizing electrical cost) or add electricity to boost performance (up to the 'pure' ETC idea) You can also utilize the technology on Liquid propellant and possibly even Light Gas guns - it stacks quite nicely with other ideas. You can even use it with a bigger caliber. This is part of the ETC charm. Further information on ETC stuff can be found here: AN END-TO-END MODEL OF AN ELECTROTHERMAL CHEMICAL GUN Electro-Thermal Chemical Gun Technology Study Both of these are articles I like, but there's more stuff: Electrothermal-Chemical (ETC) Technology Weaponization Issues Electrothermal-Chemical Gun Systems Utilizing Novel Electric Solid Propellants And of course DTIC is a wealth of ETC stuff: (direct pdf links): Overview on the German R&D Programs on ETC Gun Technologies for Main Battletank Weaponization ELECTROTHERMAL-CHEMICAL PROPULSION AND PERFORMANCE LIMITS FOR THE 120-MM, M256 CANNON And some dtic links to ETC stuff that requires download: Electrothermal-Chemical (ETC) Propulsion with High Loading Density Charges. Ballistic Analysis of Electrothermal-Chemical (ETC) Propellant. Trade-Offs in Performance Enhancement of Solid-Propellant (SP) Electrothermal-Chemical Guns. Sturgeon's House user sevich also posted a link to a useful ETC document off ditc here
  11. A_Mysterious_Stranger

    Help me understand tank suspension

    Well there's different kinds of suspension that have evolved since WW1 and they offer different tradeoffs (although some have been superseded) such as cost, simplicity/reliability, effectiveness, etc. but I also think there may be an element of semantics to it (how people define such things, which is where the sources you use and quality of that source) probably applies. Also there's going to be more issues than just 'speed' to consider in your suspension choice. For example on page 319 of Jane's: It would seem tradeoffs and design (complexity, protection, weight, internal space) are drivers over 'good' or 'bad' decisions as how it is implemented (possibly getting back to the 'semantics' again?) Speed will matter too since that affects comfort/safety/stability of the crew and vehicle vibration and such matters as Collimatrix described (the better a suspension can cancel out the bouncing/shaking of rough terrain, the faster you could in theory go.) but it's still going to be about tradeoffs in the end (including speed.) Also, the suspension itself is just part of a larger system (Wheels for example, which is also discussed in Janes) which can also play a role and probably shouldn't be ignored. Differences in engineering and metallurgy (especially over time) probably affect things too. Sorry if that isn't answering what you're specifically asking I'm trying to guess at it from your words and where in Janes you're alluding (unless you mean the Damping section?) Edit (again after many): Maybe this is what you're referring to from 13.4 in Jane's? https://imgur.com/a/Et56F
  12. A_Mysterious_Stranger

    Documents Repository: Small Arms

    It's amazing what you can find on DTIC, isn't it?
  13. A_Mysterious_Stranger

    Documents Repository: Small Arms

    And more DTIC oddities: INTERIOR BALLISTICS OF LIQUID PROPELLANT SMALL ARMS LIGHTWEIGHT RIFLE/SUBMACHINE GUN A COMPENDIUM OF BALLISTIC PROPERTIES CF PROJECTILES OF POSSIBLE INTEREST IN SMALL ARMS A TECHNICAL ASSESSMENT OF ELECTROMAGNETIC PROPULSION FOR SMALL CALIBER WEAPONS APPLICATIONS DYNAMIC ANALYSIS OF SHOULDER-FIRED WEAPONS SHOULDER-FIRED WEAPONS WITH HIGH RECOIL ENERGY: QUANTIFYING INJURY AND SHOOTING PERFORMANCE
  14. A_Mysterious_Stranger

    Gun Science Library

    A UNIFIED THEORY OF PENETRATION (U) MECHANICS OF PENETRATION: ANALYSIS AND EXPERIMENT IMPACT DYNAMICS: THEORY AND EXPERIMENT
  15. A_Mysterious_Stranger

    Gun Science Library

    I've noticed there is no repository for ballistic science documents the way there is for the Mechanized or the infantry forums (for example) so I decided to fix this. My first offering is dtic stuff from the past on some weird and novel ways to extend the L/D ratios of spin stabilized projectiles. I originally learned about this from someone I was having a discussion with years back and hunting lead me to one of those discussions about bringing back the battleships on navweaps discussion boards where one of the posters (Zenmastur) laid out his master plan for Battleship resurrection. Which included the aforementioned 'higher than 6:1 L/D ratio spin stabilized projectiles'. It took awhile to hunt down but I eventually found some of the original documents that focused on novel projectile shapes (for a large improvement) and non-conical boat tails (for a much smaller improvement) Obviously this went nowhere insofar as I am aware, and I suspect they had drawbacks nobody addressed (like most do) but it's an interesting thing to look at anyhow. Much of this is the work of one Anders S. Platou, who seems to be as prolific as the RAVEN guy. AN IMPROVED PROJECTILE BOATTAIL AN IMPROVED PROJECTILE BOATTAIL. PART II. Improving the Flight Performance of Projectiles MUZZLE-BLAST-INDUCED TRAJECTORY PERTURBATION OF NONCONICAL AND CONICAL BOATTAIL PROJECTILES THE EFFECT OF VARIOUS BOATTAIL SHAPES ON BASE PRESSURE AND OTHER AERODYNAMIC CHARACTERISTICS OF A 7-CALIBER LONG BODY OF REVOLUTION AT M = 1.70 YAWSONDE FLIGHTS OF 155MM NON-CONICAL BOATTAIL PROJECTILES AND THE 155MM M549 PROJECTILE AT TONOPAH TEST RANGE-OCTOBER 1977 YAWSONDE FLIGHTS OF 155MM NON-CONICAL BOATTAIL PROJECTILE-B CONFIGURATIONS AT TONOPAH TEST RANGE--MARCH 1978 AEROBALLISTICS OF 9ORKSCRE1 PROJECTILES (12 page document) AEROBALLISTICS OF CORKSCREW PROJECTILES (36 page document)
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