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ARS

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Everything posted by ARS

  1. AFAIK, most Russian warships that doesn't use gas-turbine or nuclear propulsion used Mazut as fuel. In the west, this is commonly called "waste oil" and in petrochemical term, Mazut is much like the equivalent of Number 6 Oil (Bunker C), and is part of the products left over after gasoline and lighter components are evaporated from the crude oil. Mazut is considered as "dirty oil", you're supposed to process Mazut with FCC or RFCC process to eventually produce the final product: diesel fuel, although it can still be used as fuel by itself, primarily in large boilers or power generators, since it has a high energy value. The drawback is the thick black smoke it produces (like Admiral Kuznetsov's infamous trails of heavy black smoke)
  2. So... I've noticed that on early version of steam locomotives, the chimney is tall and big (like the classic funnel-shape chimney) compared with the actual boiler. But then as the steam locomotive gets bigger, the boiler seems gets huge while the chimney gets smaller. Is there a reason for this? Because in theory: bigger boiler = more steam= more exhaust
  3. I wonder how the stabilization would deal with the boat swaying on water
  4. The days of battleship era was near its end when naval aviation becomes practical and carriers become viable weapons of war, with the main selling point being able to strike battleship far beyond its gun range. After the war, although there's still some battleships around, the doctrine then shifted more from naval gunnery to guided missiles, thus, the battleship era was totally ended when guided missile technology has matured enough to place it on nearly all types of surface vessels, from the smallest to the biggest. Now, I saw some interesting discussion on mobile warship game, basically it boils down to this: Proponents of battleships argue that the main reason the battleship era ended was because the range of engagement gets farther and farther, far beyond their main gun range (the main selling point of a battleship). If the range disadvantage was removed, the battleship couldstand a chance to win if the modern warship is forced on close quarter combat. The battleship's heavy armor will allow it to withstand some missile hits while the main gun could blow the modern warship apart (which is much less armored than WW2 era battlehip) Now, what I find interesting is that the notion that battleship main gun being able to blow a modern warship apart. Now what I want to as is, if the 2 ships encountered each other, and then: 1. The battleship fired a salvo of main gun shells (let's take 9 shells, the most common number of main guns on most battleships) 2. The modern warship (let's say a destroyer), just stand still, not doing anything, except trying to intercept the 9 shells with modern CIWS Does modern CIWS is sophisticated enough to track and destroy an object like incoming battleship shells? If it is, then yeah, the battleship has no hope at all against modern warship
  5. Is it possible to make geostationary orbit on polar region (either north or south)? Or if it's impossible, is there any satellite network design that achieve basically the same result? (continuous survey of the same landscape on polar region) How many satellites (at the bare minimum) required to achieve it?
  6. How SRB being more expensive than liquid fuel rockets when SRB is relatively simpler in design? (no kind of complicated plumbing, valves, fuel lines, cryogenic fuel tanks, etc.)
  7. Does this statement correct? "The solid-fuel rocket provides massive thrust at cheaper price than liquid-fuel rocket, at the cost of its inability to be throttled and turned off once ignited and short operating time. With high thrust to weight ratio, a strap-on solid rocket booster is always a good choice to be added for an extra thrust during the liftoff" Mainly on this part: "...a strap-on solid rocket booster is always a good choice to be added for an extra thrust..." Since SRB usually have high TWR (more than enough to lift it's own mass to pretty high altitude before running out of fuel), strapping them on larger rocket seems like a good idea for "free" extra thrust (strictly speaking from physics standpoint, ignoring cost or other mechanical complexity). However, is there any situation (payload profile, weather condition, a certain point in rocket's total mass. In a sensibly-designed rocket of course) that makes adding a strap-on SRB no longer provides any benefit and instead being detrimental to the mission?
  8. A circle with infinite radius is a line, close to infinity means slightly curved line
  9. Ah I see, so that's before the era of guided missiles when people start to distinguish between the guided/ unguided distinction
  10. Isn't that applies on every rockets and missiles? I thought the missile definition generally means it's guided, while a rocket is the 'less guided' (or unguided) term. People called the V2 as 'rocket' even though by definition it's a cruise 'missile'
  11. Considering the operational parameters, design and operating principle, does V2 considered as a missile or a rocket?
  12. Just like how deforestation affect the change on Earth's climate, could (over)-reforestation (I don't know the term, but essentially too much trees on the planet) push the Oxygen level on Earth's atmosphere to a deadly concentration?
  13. That makes me wonder, how far you can 'compensate' the hardware below system requirement with other hardware (for instance, the RAM needed is 8, but you only have 4, though the processor is I7 instead of I5 system requirement. Or the GPU is below system requirement, but the RAM and processor is way above the system requirement)
  14. In space, if you use an extremely powerful directional microwave emitter (more than what spacecraft hazard protection designed for), could you actually blow up incoming target (fighters, missiles, ships, etc.) by cooking up their warhead/ ammunition? Or for the short version, could you cause ammo cook-off by using directional microwave? (which in turn, caused magazine detonation)
  15. With such a low-pressure environment, if we're looking for hypersonic realm of speed (from engineering standpoint, strictly about speed, not about it's application on hypersonic ordnance), which altitude is preferrable? Low or high? Since at low altitude, the higher air density makes hypersonic engine (ramjet, scramjet) easier to use since there's plenty of air to feed it, but the aerodynamic heating would be deadly, while at high altitude, the heating might not be as severe as in low altitude, but the thin air might impede the engine's performance
  16. What's the design consideration specific for aircraft operating at extreme altitude? Because one one hand, we have the slow-moving aircraft with near-glider like characteristic such as U-2, but on the other hand, we have a literal speed demon with overkill engines like SR-71 or MiG 25/31 Also, does this statement correct?: "A material with high melting point is stronger in terms of mechanical characteristic than material with low melting point"
  17. Is it possible to make a helicopter carrier accomodate fixed-wing carrier based aircraft by outfitting the ship with catapult (to compensate for shorter runway on deck)? That way they can act like WW2 light carriers, lower number of aircraft onboard but can still do carrier duty
  18. I've seen multiple times on works set in WW2, be it games or movies, that everytime there's a soldier carrying a flamethrower, if a bullet struck a backpack he carries, it usually blows up in a massive fireball, engulfing the user and anyone nearby. Is this true to real-life? Because AFAIK, military grade-flamethrowers does not use gas-based fuel, only liquid (because it sticks better to enemies), and liquid is not compressible, so if a bullet pierced the tank, the contents inside is not under pressure, so there's no sudden expansion that can cause the whole backpack to rupture. And if I remember, military flamethrowers are specifically designed to be slow-burning and hard to ignite to maximize the burn effect and only burns when you want it to burn
  19. While browsing the web,I found some very amusing tank designs, it's either hillarious, absurd or ouright cursed. Here, take a look and find everything wrong with the following tank designs (or for challenge, find the practical use of such design) :
  20. I wanna ask some stuff about Outer Space Treaty: 1. If country A build a moonbase, then country B landed a rocket nearby and also build their own moonbase. Both (technically) didn't violate each other's territory since it was a neutral territory to begin with (and as long as they behave peacefully with each other) 2. Since the OST only specify WMDs and nukes that's prohibited to be placed in orbit, that means regular ballistic weapon (cannons, railguns, autocannons) and non-WMD weapons (missiles) are still allowed right? 3. If a country didn't participate in the OST (non-parties), does it mean they are exempt from the WMD rule? (aka, they can place nukes and WMDs in orbit) 4. What actually constitutes as contaminating space? Does a spent shell casings, discarded booster rockets, defunct satellites and missed railgun shot that continually travels out of solar system count as 'contaminating' it? 5. If we take a sci-fi tech such as phase technology (i.e technology that allows phasing between realspace and phasespace) and place a nuke in phasespace, technically it isn't a violation of OST right? (since the nuke isn't in realspace (actual space))
  21. Suddenly Armageddon's quote makes much more sense now: 'being a driller is more difficult than being an astronaut' (as long as it's in space)
  22. In many sci-fi settings, there's a lot of plot points of mining asteroid or planet to satisfy the demand of precious metals, and just now, I saw an article about 2 high-density ore asteroid that's supposedly could satisfy global demand of precious metal. If we take a real-life logic to this situation, is it worth setting up a space mining operation (orbital operations, spaceflight, the mining, and logistic transport) for ores with jacked up market price just to satisfy economic demand? (assuming that space travel is still limited, like today)
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