Comments by "Helium Road" (@RCAvhstape) on "Curious Droid"
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IIRC the orbiter's tile heat shield system was the biggest expense in terms of time between flights. All those tiles had to be inspected, many replaced, and it was painstaking manual labor that cost a lot of time and money. The main engines were expensive to maintain, too, but they had a rotating pool of engines to swap out after each flight; while some were being torn down and refurb'd there were good ones available off the shelf, so the engines did not cause as many headaches as the heat shield. There were also a lot of other, smaller things that added up; swapping the windshield glass after every flight, for example, or even the tires after every landing. These things were technically good for many flights but NASA was trying to eliminate as many sources of accidents as was practical, and compared to O-ring redesign or debris shedding, these little things were easy to do.
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@SephirothRyu I'm sorry, but people have this sci fi movie idea of how VTOL jets are supposed to work, that taking off vertically all the time is expected, but it's not. Fact is, any VTOL jet that has wings can take off a lot heavier with a forward roll than it can straight vertical, because wings generate lift. The F-35 isn't expected to take off vertical, and the Harrier rarely does it except at air shows. These jets main strength is short field operations, and being able to use smaller flight decks at sea. The US Navy has a fleet of full size carriers, but it also has about twice as many amphibs, that, thanks to USMC squadrons, also operate fixed wing aircraft. And anyone who doubts the effectiveness and usefulness of the Harrier can just ask the Marines, who have used them extensively in heavy combat since the 1980s. A Harrier is the difference between conducting landing ops with just helicopters and conducting ops with solid fast mover support. The F-35 has some big shoes to fill for the USMC.
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Electronics used on spacecraft are usually several years behind what you can get here on Earth, because they need to be tested extensively for years in vacuum, temperature, and radiation environments, as well as cycled on/off, vibrational testing, etc., before you trust it to not fail on your super-expensive space mission, which you'll only get one shot at. Add to that the fact that JWST was delayed for many years so components like the main computer were designed and spec'd out a long time ago, and there's huge risk in altering the design once construction has begun. Even if you do make changes, they must go through a series of engineering review boards and be signed off by the program leaders, who are all very conservative-minded about taking on new risks, and then it costs a ton of money to implement the changes and retest everything.
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@giovannirodriguesdasilva646 Because the USAF, unlike the US Navy, hates the names of its own planes for some reason. The F-16 Falcon is called a "Viper", the A-10 Thunderbolt is called a "Warthog", and so on. To be fair, some of the official names of their aircraft are stupid and god only knows what Pentagon idiots chose them. The B-1 Lancer, for example. Or the B-2 Spirit. Seriously. The Navy and Marines, on the other hand get planes that mostly come with cool enough names to keep. Tomcat, Hornet, Harrier, etc.
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I know some people won't like this, but I kind of hope a meteor comes along and blankets the sites with a nice coat of ejecta powder, so we can quit acting like the sites are so sacred nobody may ever be allowed to disturb them. Nobody preserved the spot on the beech where Columbus first stepped off his boat, and nobody knows where the first human set foot on North America from the Bering Strait, and it doesn't matter. Trying to preserve every footprint on every Apollo landing site is a fool's task, especially the later sites like Apollo 17 where they drove miles from the ship on the rover. Armstrong's footprint? Sure, coat it with some kind of cement and put a marker stone next to it. Get really good detailed photos of everything, then move the equipment to a museum somewhere indoors, maybe underground on the first moon colony, where it can be protected. Put stone markers on all the sites, and then quit worrying about trying to disturb a single grain of dirt for crying out loud. Luna is a world we should be allowed to walk on and live on, not some kind of holy ground we have to treat like walking on eggshells for the rest of human history.
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There is a school of thought that land-based ICBMs are more of a liability than an asset, because in a full blown attack they have only about 30 minutes to get off the ground before they are destroyed in their silos. This puts enormous "use it or lose it" pressure on the president, who, by the time he is awakened and told what is happening, might have only a few minutes to decide to launch a retaliatory strike or not. If it's a false alarm and he launches, the world dies. If it's the real thing and he doesn't, then the enemy's first strike gambit wins. As long as missile subs are at sea and bombers are airborne, the president (or whoever is in charge if he is taken out) still has a way to ride out the first strike and take some time to decide how to respond. Thus, some people, including a former US Defense Secretary, think focusing on sea and air based weapons that can survive a first strike is a better idea.
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To answer your question re. what do I think? It is certainly an exciting idea and would be awesome to get involved in the field as it grows, but there are definite drawbacks, some immediate, and some growing in the future.
For starters, concerning large collectors and transmitters in GEO, the GEO belt is already a crowded space and there are lots of entities competing for various longitudes just for relatively tiny communications satellites, each of which eventually dies and either gets boosted to a graveyard orbit or dies in place and becomes a navigational hazard. This problem will be bigger when you're talking about multiple giant orbiting solar farms.
These large structures will also require maintenance, as the components will all have limited lifespans. They will also create issues for astronomers and any instruments using stars for navigation. The industrialization of local space may cause issues not yet thought of.
Meanwhile, on the ground, the unsightly receiving stations would, if the technology is successful, multiply and pop up everywhere, using up large swaths of previously undeveloped land. Maybe this can be dealt with by building them above buildings, to solve two problems at once: reducing heat islands while generating power. There are currently zoning battles underway in parts of the US over the construction of vast solar farms in the countryside; needless to say getting renewable energy by way of cutting down a forest seems a bit counterintuitive.
Also, although you mentioned the system would create no pollution, I wonder if you considered the heat caused by beaming all that energy onto the earth's surface, all of which will either get burned and converted to heat, or will get wasted before being collected, converted to heat as it strikes the air or ground? Waste heat from cheap, abundant energy is something Arthur C. Clark envisioned in the novel 3001: Final Odyssey, and is something that may be worth thinking about in advance.
All that said, I would love to be one of the engineers working on something like this. Social problems and all, count me in.
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The A-6 is regarded by some as the best naval bomber ever built. All weather, night time capability with a bomb load comparable to a B-17, and the later models had advanced avionics upgrades as well. The only reason the US Navy isn't still using them is because they wanted to save money for the F-35. Northrop Grumman was on the verge of building new ones in the early 2000's. Yes, I know the RN used the Buccaneer, not the A-6, but I was comparing what the RN had in 1982 to what the USN had in 1982. In the early 80s Phantoms were the naval interceptor of choice before the F-14 replaced them. Regarding the Sea Harrier, I am a big fan of the Harrier family of jets; the USMC has used them extensively in combat for decades now, but a force based on Harriers alone is a bit thin. They lack the speed and firepower of a Phantom and the payload and survivability of a Buccaneer or an Intruder. When the USMC uses them, it's within the context of a force that included Tomcats, Hornets, Intruders, etc. And USMC Harriers are optimized for ground attack/close air support. Argentine fighter pilots were at the edge of their range when they went up against Harriers, and the RN pilots used this to their advantage. But with a CATOBAR carrier and Phantoms, the RN could've had more influence over the airspace closer to shore and made life more difficult for the Super Etendard's and other Argentine aircraft.
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The problem with projects like this is it's such a high stakes gamble, it drives up the price, which makes the stakes higher, which drives up the price, which makes the stakes higher, which drives up the price, which makes the stakes higher, which drives up the price, which makes the stakes higher, which drives up the price, which makes the stakes higher, which drives up the price, which makes the stakes higher, which drives up the price, which makes the stakes higher, which drives up the price....anyway, the damn thing better work.
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I think it's a sign that aeronautic technology plateaued around the middle of the last century to some degree, at least when it came to large utility aircraft that don't require stealth and stay subsonic. The C-5, C-130, B-52, Tu-95, these are all large airframes that don't have to do anything particularly fancy other than carry large amounts of stuff long distances and in some cases, drop that stuff. Even modern jetliners all started looking the same as early as the late 70s. As long as they don't stress the airframes too much by pulling hard Gs or flying low level too often, they can avoid metal fatigue for many decades. And because they are big airplanes they are pretty easily upgrade with new avionics and other subsystems. That said, C-130 is still in production and new ones are rolling off the line today, much improved versions at the beginning of their service lives, while the last B-52 was built in the 60s.
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For aggressive exploration of the Solar system, nuclear power is really the only realistic option. And right now, "nuclear" means "fission". If fusion ever becomes practical, that makes it easier, but for right now fission power, be it nuclear thermal or nuclear electric, is what we have to work with. We need to get over the political objections, get to work to make these things as safe and reliable as possible, and start building and flying them. It doesn't have to be NASA or some other government, it can be private/commercial or whatever, but it has to be. If humans are going to get beyond the moon with enough numbers and mass to make it worthwhile, this is the way to go.
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