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About Alchemist

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  1. Alchemist

    Duna Outpost Mission Architecture Challenge

    TAC-LS comes prepacked with community resourse pack, which seems to be shared by a multitude of mods. So yes, there are such resources defined in the atmospheres, but in TAC-LS itself I've only found some filter to get oxygen on Laythe. But various planet base or ISRU mods may have such extractors. Planetary Base System has just such part that can scoop several resources if those are present in the atmosphere, some other mods may have the same just in different shape.
  2. Alchemist

    Duna Outpost Mission Architecture Challenge

    So trying out some mods for the challenge. TAC-LS because why to fake life support if you can just use the working stuff, PBS for some advanced LS functionality (and the base parts are quite the good stuff), KAS/KIS to be able to transfer supplies between vehicles... I think I like this base for 4 crew. It even has a lab (apart from the shape it's same as the stock one), so the first expedition will have quite some research to do all around the planet. Life support sustainability: water seems to be fully recirculated if you don't spend it in converters, oxygen regeneration from CO2 is not 100% self-sufficient, but when you can pump some extra CO2 from the air - no problems with that. The only resupply needed is food, and I stuffed there more than enough to last until next window. For the future expansion it could also be possible to add a module capable of growing food (mining water and some ore required). As shown by some "simulations", the base can survive the landing on Duna from near-Hohmann transfer (although doing it faster will end up losing the mobility part) and incidentally the wheels are OK with chute-only landing. Still need to complete launcher second stage and investigate the payload capacity, but there may be quite the option to take the satellites on the first launch as well (there's too much empty space under the belly when you wrap this base in a fairing). Some other planning elements: Space bus - Definitely an ISRU-equpped vessel. Should also double as crew transfer vehicle and refueler for any orbital operations. As a bonus, being able to refuel itself means the ability to do make suborbital hops, making any location accessible from any orbit and vice-versa. Bonus feature: if originally launched not on window, can be used to mine some fuel from Minmus for the next group of interplanetary ships Backup plan - If we really go for a mobile base, especially considering long-term stay in high latitudes (like if mining water in polar regions for the greenhouses), the best option for a rescue vehicle(s) is to be parked in polar orbit from which any surface location is accessible within a few hours. of course, that still leaves the question of how such vehicle should ascent in the case of evacuating the crew from polar area if the station/interplanetary ship is in low inclination orbit - need to have the DeltaV for such maneuver. I'll probably deploy multiple (as the base grows) such ships, each capable of recovering 4 crew (speaking of which - if the late-stage base can be split into several mostly independent rovers, most likely emergency situations would require only partial evacuation) Duna Space Station - yeah, the question of likely high-latitude operations leaves a huge question of where to place the station - polar orbit makes huge issues with interplanetary transfers, equatorial orbit has issues with high latitudes. Probably equatorial orbit is better overall. Deep space transit Hmmm.... a huge supply stockpile in the LKO station? Yeah, that's one way it can be actually useful and one reason to dock the interplanetary craft to it! And I think I'm totally making the transit craft in the shape of a Mk3 shuttle. Perfect option for aerobraking - both in terms of melting temperature and for aligning orbit plane with the station. And about the "free" crew shuttle I have a total overkill issue. I have an almost free to operate (yes, 100% reusable, just strap the orbiter back on the launcher and fill the fuel) crew shuttle, but it has capacity of 36 Kerbals to Mun orbit and back. Yes, that's where I'm taking the first stage from.
  3. Alchemist

    Duna Outpost Mission Architecture Challenge

    I seem to have got a sudden urge to try this. So, for the launcher I really want to use this first stage. It separates from payload/next stage in upper atmosphere on suborbital trajectory (parameters are 48 km / 1395 m/s for the original shuttle made for it, but can be a bit different for the cargo config). Then it boosts back and... you see... (Note: the launch sequence is fully kOS-scripted and doesn't lose LoS with KSC) Now the payload capacity is a big question... originally this is used with a crew shuttle that after separation reaches LKO weighting (hey! no such thing in orbit!) having mass of almost 65 tons... and with just the Delta v to reach Mun orbit and get back. Of course, that kinda equals payload + dry second stage. So for this mission profile I still need to design alternative second stage (reusable?) and test the actual payload capacity with it... (additional note: launcher return timing sets certain second stage TWR requirements) Could likely be around 50 tons of pure payload or slightly more. Some thoughts: So, the transfer window at the start of year 10 (with no more mission value to make or lose on new crew) is a good option to wrap a few achievements up (like the emergency takeoff), isn't it? Also this scoring totally gives some incentive to stretch the transfer windows a bit basically, a good list of things for the second window if not to overstress the crew. Now this makes me wonder what's the Delta v cost of overstretching the windows around beginning of year 4 into a quick there-and-back transfer for a return module (if there is such concept for Mars flyby, this kind of transfer profile should be usable for Duna). Although the late launch / longer transfer option soon after first window can be better suited for such package if not launched on time for normal transfer And what about refilling the life support at Kerbin? Without it, running the reusable transfer vehicle doesn't have much point, if you still have to launch LS freighters separately How exactly these ones are supposed to work: does the the third automatically include the previous ones or do they require several vehicles?
  4. To be fair, there is high chance that all Kraken possession cases are traceable to some kind of backdoor-opening exposure. Thompberry's parents - studied an anomalous artifact. Carlenna - not really known (or at least I can't remember a direct explanation), but given her involvement with Parka, could be linked to the same artifact. Parka - it actually took quite a ritual to overwhelm him. Mary-Sue Pleasant - not known, but could had tried in her witchcraft practice to unlock secrets of some thing that turned out to be stronger. Badie and the Professor - direct mental attack by Kraken Empress (possessing a powerful Witch) And then we have Thompberry knocking Saffron out with unexpected additional effects of applying Kraken gravioli tech. And the body then changes the occupant several times. Totally fits the pattern P.S. If there are only 4 Krakens (at least in that faction), one of them taking a new host an then getting destroyed also leaves a huge question of what happened to the previous body... Or if in such case that body (given it is still usable) could act as a backup even in case of mental disintegration in the new host
  5. Now the question is: Siren acoustic powers or Kraken telekinesis? Or Kraken-enhanced Siren blastwave? And by the way, Chibi might have miscalculated a bit when dealing with the Kraken: even with each tentacle having pretty much a brain of its own, there still is the part in the cephalopod's head - making it 9 loosely attached neural entities. So while everybody was fighting the eight tentacles... unfortunately for the Kraken there was someone to take on the central core from within. But anyway there must be a huge difference between having your own body rebuilt into a new shape and awakening (especially after thousand years of crazy madness nightmare) in the body that just recently belonged to somebody else. Speaking of which (not that anybody would object too much, especially her ex) what happened to Saffron's mind? Was it eaten by the Kraken? Or maybe good old Thompberry actually krakened her into a psychic black hole (possibly leaving open back door for the possessor)? Or is there anything left anywhere? Will Sanny get a ghostly companion (and a worthy fellow trickster at that)? ... stay tuned for the next episode of Emiko station...
  6. Alchemist

    Этот Апоцентр...

    Выход на стационарную орбиту над определённой точкой делается так: выходишь на экваториальную орбиту (если стартовать далеко от экватора - запуск на восток на низкую орбиту, наклонение исправим позже) поднимаешь апоцентр на нужную высоту (если с наклонённой орбиты - так чтобы апоцентр был в плоскости экватора, при экваториальном старте можно сразу поднимать апоцентр до стационара) в апоцентре замечаешь, насколько планета должна повернуться, чтобы нужная точка оказалась под этой точкой орбиты и сколько это займёт времени и корректируешь период (поднятием перицентра), чтобы на следующей орбите (или через несколько оборотов) корабль оказался в апоцентре над заданной точкой (если стартовать с наклонной орбитой, коррекция плоскости распределяется между этим разгоном и следующим этапом циркуляризации. оказавшись на следующем витке (или через несколько) на нужной высоте над нужной точкой, остаётся только циркуляризировать орбиту (и полностью исправить наклонение, если было) Примечание: подбором времени старта невозможно изменить позицию относительно поверхности, на которой окажешься, если лететь прямо на стационарную орбиту. Потребуется провести немного времени на промежуточной орбите с правильно подогнанным периодом, чтобы потом выйти на стационарную орбиту над нужной точкой.
  7. Alchemist

    What did you do in KSP today?

    No, the one with 4 jet engines is OK-GLI - airframe test aircraft. It was never meant to be a space-worthy orbiter, just a full-sized model for testing approach and landing. And 2 extra jets on the sides were needed just so it can take off and gain some altitude on its own (not by dropping from a larger aircraft). The actual jets were not powerful enough, since they were meant just for extending the gliding range Well, the only reason the jets on the top weren't there on the actual flight of Buran (they actually were uninstalled from the orbiter!) was exactly because they weren't fully approved for reentry by that point Those are orbital maneuvering engines. The ascent engines are on Energia.
  8. Yeah, something as complex and expensive as Hubble is probably the only kind of payload that is worth being serviced by a Shuttle. And that's pretty much the problem of too much versatility combined with high capacity - you just barely ever get a job that is worth all of that (at least unless it is some emergency "screw efficiency, let's quickly adjust an existing vessel for this"). Pretty much the same story happened to TKS - it just turned out to be better turned into station modules than used as supply craft Another funny thing is, the question of station supply just got stuck with Soyuz & Progress on one side - which are really a bit too small for anything larger than Salyut - and the Shuttle on the other side - which is basically half the size of the station, a bit overkill for just regular supply and crew rotation runs, isn't it? (well, unless somebody actually finds reason and funding for that Mir-2 idea with multiple 100 ton modules - for that Buran would probably be an appropriate supply craft). At least nowadays there are Dragon and ATV as more appropriate-sized supply vessels. Well, my mentality is more soviet (even if USSR fell apart before I was old enough to remember anything... not fully sure why I picked that up or what to do with it in the modern world), so I'm more inclined to the other side, except it is much more exciting to look through scraps of Buran-era projects (or even earlier, but guess who had the nasty habit of burying old ideas each time when starting anew), than what actually has been happening ever since. To name a few Buran-era developments that would really be a huge improvement for actual space infrastructure: Zarya spacecraft - launched by Zenit rocket and featuring a reusable capsule pretty much twice larger that Soyuz descent module. Not exactly shuttle-related, but supposed to act as both crew transport for Mir (and at least with somewhat decent capacity for returning experimental packages, unlike Soyuz) and crew rescue option for Buran (in case reentry becomes unsafe). Also they really considered propulsive landing (reminds of something, doesn't it?) MAKS mini-shuttle - highly reusable (still features single-use ET), air-launched (speaking of stealing satellites...) and featuring tri-propellant engines (Kerosene/LH2/LOx for maximum thrust and lower ET volume on initial ascent, continuing in LH2/LOx mode after kerosene used up). How many times have they been talking about reviving this project? Energia-2 - a fully reusable launcher done right (kind of slapping Buran's wings and heat protection on second stage of Energia). Basically, with no crew capacity and thus no need to keep it perfectly man-rated, it should be much cheaper to operate that STS while having a bit more payload capacity (but no capacity for payload recovery). Options for first stage vary from using normal Energia boosters as initial variant (those are reusable, but you'll need to pick them up from where they land), to having boosters with deployable wings and small jets to fly back to base, to even replacing them with one winged booster similar in size to second stage (just fueled with Kerosene instead of hydrogen) attached to it belly-to-belly. Some variety of spacecraft sharing key technologies would probably been much more interesting (and more feasible as well) option than trying to stretch a single design onto all the applications
  9. Alchemist

    [1.4.1] kOS v1.1.5.2 : kOS Scriptable Autopilot System

    This IF will be done once and then it waits for the apoapsis to reach the desired value you need a proper cycle until ((shipPitch <= 1)or(apoapsis > 85000)) { WAIT 0.2. SET shipPitch to shipPitch-0.2. } WAIT UNTIL apoapsis > 85000.
  10. Alchemist

    [1.4.1] kOS v1.1.5.2 : kOS Scriptable Autopilot System

    You better not redeclare the same locks in a cycle - they are getting constantly reevaluated all the time anyway. This would be enough: lock targetPitch to 88.963-1.03287 * alt:radar^0.409511. set targetDirection to 90. lock steering to heading(targetDirection, targetPitch). wait until Apoapsis > 75000.
  11. And those were just the kind of missions - large-scale orbital repair and payload recovery - that shuttles of this class are perfect for. Because, let's be honest, most other things STS was used for are either perfectly doable with smaller rockets (at least NASA Shuttle could pull off the argument of having the orbiter as mostly reusable second stage... which still ended up not that cost-efficient; Buran had no such thing, so unless you absolutely need the orbiter you are better slapping 100 tons of payload right on the side of Energia or if you need to launch only 20-30 tons use Proton or Energia-M) or can be designed to be doable without a shuttle unless you specifically put your stake on using the Shuttle (docking a module to the station? TKS-based modules have no problem docking themselves) On the other side, it is a huge shame that it all came to both space programs crashing down to the point of barely having resources to keep existing things going. Where are all the Mun Moon bases, Mars expeditions, just more optimized vehicles for Earth orbit operations? (OK, at least now SpaceX is doing something real on the last part) Even ISS was mostly made from parts each side was developing for their own station Has humanity really lost the interest in space exploration? (Well, apart from Elon Musk) Great, now I'm thinking of some kind of techno-hippies demanding "Make SCIENCE not weapons!"
  12. It's quite ironic how such stories tend to repeat. Just a decade after that there were some plans to bring Salyut 7 after it has been decommissioned back to Earth (presumably, just the station core; there also was a TKS docked to it as a module). Unfortunately, by the time Buran launched for the first (and, as it turned out, the last) time, the station practically ran out of fuel for orbit corrections and soon after that (while the further flights for Buran just weren't happening) fell into the atmosphere... Recovering a station module - could be a good idea for another test mission?
  13. Given that there turned out to be enough runway, I adjusted the distance at which the launcher turns back accordingly Safety committee? Where on Kerbin did you find that? and how would they classify extending physics range for an object moving fast on ground? (well, without that the launcher would freeze the moment it touched the runway if beyond several hundreds meters of active craft) You just hadn't seen how it goes haywire if you go in too steep. At least this time the turn went smooth, but it still shows certain issues, like much higher drag than expected. Also it plunged on the runway with 10 m/s vertical velocity when it should have done it gently and also overshot the start of the runway quite a bit (scratch this one - found a mistake in the code, but now it tends to undershoot). Anyway, this shuttle has a decent lift but terrible pitch authority (it barely pulls 15 degrees AoA with airbrakes deployed), I guess some autopilot elements just don't like such performance especially at low speeds (not to mention PID loops not liking too sharp turns altogether). I think for this ship it is better to use somewhat gentler approach and with jets enabled to maintain proper airspeed - that's the reason for those engines being there in the first place. Need to see how this landing script handles something with more shuttle-like aerodynamics... Other than this shuttle's winged booster coming home after the nominal launch? Well, let me think of something... Yes, turns out Buran's RTLS abort sequence (for 1 engine loss) is quite similar to that of Space Shuttle. Which also shows some interesting insights: looks like reaching up all the way to space is not exactly about aerodynamics requirements for the maneuver (with possible trajectories ranging pretty much twice in terms of maximum altitude and distance), it is more of the burning almost through the entire LH2/LOX tank (which, to think of it, makes the procedure maximally uniform with latest point for RTLS abort which is exactly about just enough fuel to turn around and fly back). of course, loss of a central stage engine would be less of an issue for Buran, since there there are 4 of those engines unlike 3 SSMEs on the Shuttle. So for Buran the windows for RTLS and orbital abort modes even slightly overlap, and gliding to some other airstrip along ascent trajectory would only be used in case some bigger malfunction causes loss of the entire rocket. another thing to cause RTLS would be malfunction of a booster engine. With 1 booster non-operational and diametrically opposite one shut down (more for structural stress not controllability reasons, also this shutdown won't happen until a certain altitude) Energia would lose almost half the thrust at this early stage of flight (BTW, the boosters had valves to flush the LOx at the nominal usage rate in case of engine shutdown), which would end up in Buran flying not that far or high as in case of second stage engine loss. (at least the liquid fueled boosters give more chance to fix the situation than in case of those SRBs malfunctioning) in both of those cases the actual maneuver would start only after booster separation. Also, the abort program includes OMS burn at the start of RTLS, both to reduce the orbiter mass and likely to help with pitch turn. the separation starts with pitching down while starting OMS, then shutting down the rocket's engines, and quickly pitching up (with use of RCS) straight after separation. OMS continue to run for a while to adjust trajectory and burn fuel. (another note: the program also mentions dumping orbiter's LOX before landing - if still too heavy?) Yeah, sounds interesting...
  14. Alchemist

    What did you do in KSP today?

    Experimenting with shuttle-style unpowered landing... on autopilot