raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Galileo. We currently target 1.5.1, 1.6.1, 1.7.x, 1.8.1, and 1.9.1. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly… | <egg> also 4e16 m * 2^-52 is uncomfortably large
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<discord-> R​urouniDonut. — ah man
<discord-> R​urouniDonut. — planning a venus flyby and return to Earth is tough
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<discord-> R​urouniDonut. — At first inbound
<discord-> R​urouniDonut. — But then I tried outbound
<discord-> R​urouniDonut. — But it was hard to get pe close to Venus and to Earth
<discord-> R​urouniDonut. — I think I need to be more in plane with it
<discord-> R​urouniDonut. — When my pe is close, its at a high inc
<discord-> A​nomaly. — This is a crewed flyby?
<discord-> A​nomaly. — I'm assuming because you need to return.
<discord-> R​urouniDonut. — Yes
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<discord-> k​evin. — @Anomaly is there a link to lrinicpia
<discord-> k​evin. — Principia*
<discord-> D​amien. — @悪魔ケビン Google principia github. The download link is in the readme
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<discord-> p​uma949. — can I somehow contract the affect of orbital perturbation? Can I somehow see the combined gravity vector?
<discord-> A​nomaly. — Could you be a bit more specific? What is it that you want to acheive?
<discord-> A​nomaly. — Could you be a bit more specific? What is it that you want to achieve? (edited)
<discord-> p​uma949. — as you know most orbit are not 100% stable if I want to launch a sattelite into a very specific orbit and keep it there for some time without those oscilations
<discord-> A​nomaly. — Ah, you refer to stationkeeping. KSP cannot support that at all.
<discord-> A​nomaly. — Hey, new Principia is out!
<discord-> D​amien. — @puma949 you can view your projected trajectory to get an idea of its stability. also the orbit analyser tool in principia gives you the raw numbers
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<discord-> p​uma949. — waht does new pricipia add?
<discord-> D​amien. — ```
<discord-> D​amien. —
<discord-> D​amien. — Support for KSP 1.5.x, 1.6.x and 1.7.x has been removed: this version of Principia requires at least KSP 1.8.1.
<discord-> D​amien. —
<discord-> D​amien. — A Rebase button has been added to the flight plan. This button discards past manœuvres, and sets the flight plan initial state to the current state (in terms of mass as well as position and velocity).
<discord-> D​amien. —
<discord-> D​amien. — The navball guidance node has been changed so that, at the end of the burn, the SAS switches to holding attitude, and MechJeb (if used) ceases burn execution and shuts down the engines.
<discord-> D​amien. —
<discord-> D​amien. — A number of features have been added to the orbit analysis window:
<discord-> D​amien. — a warning if any of the following occur over the course of the mission:
<discord-> D​amien. — dropping below the nominal atmosphere height: reentry,
<discord-> D​amien. — dropping below the highest terrain altitude: collision risk,
<discord-> D​amien. — dropping below the lowest terrain altitude or, on a planet with oceans, sea level, whichever one is higher: collision;
<discord-> D​amien. — lowest altitude: the lowest altitude reached over the course of the mission;
<discord-> D​amien. — altitude of mean periapsis: the altitude corresponding to the periapsis distance itself corresponding to the mean semimajor axis and mean eccentricity;
<discord-> D​amien. — altitude of mean apoapsis: the altitude corresponding to the apoapsis distance itself corresponding to the mean semimajor axis and mean eccentricity;
<discord-> D​amien. —
<discord-> D​amien. — The message emitted on Linux and macOS if an error is encountered while loading the Principia DLL has been made more precise.
<discord-> D​amien. — ```
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<discord-> p​uma949. — what are the good moon launch windows from Cape Canaveral ?
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<discord-> S​tandecco. — @egg are you around?
<discord-> S​tandecco. — I was mostly wondering where the effect that you see when launching a rocket straight up from the surface comes from mathematically: if you launch a SR high enough, you'll notice when it comes back down that it's drifted westwards from its launch site. While I understand it intuitively, I don't really see where it comes from in the fictitious forces
<discord-> S​tandecco. — (I'm asking here because principia and reference frames so you know)
<discord-> D​amien. — @Standecco has the craft drifted, or has the earth moved under it?
<discord-> e​gg. — Coriolis
<discord-> S​tandecco. — thought about that too, but wouldn't coriolis be cancelled when coming back down?
<discord-> D​amien. — why would it?
<discord-> S​tandecco. — same v at any point in the trajectory, but opposite sense
<discord-> D​amien. — if you teleported an object from the launch site, to a point in space above it then back to earth in straight line, it would have drifted westward by the distance the earth travelled in its rotation during the time it was off the ground
<discord-> D​amien. — probably not that simplistically but about that much
<discord-> S​tandecco. — Yes i got that part, I know what happens intuitively
<discord-> D​amien. — the amount of drift probably depends on the latitude of the launchsite and the trajectory you take
<discord-> S​tandecco. — To not drift the craft would have to maintain the same angular speed as earth's surface, but since it's getting further from the center of earth it would have to speed up a bit, and that's why it gets behind a bit
<discord-> D​amien. — if your trajectory takes you closer to the equator the drift would be larger, and the reverse if going towards the poles
<discord-> e​gg. — You pick up westward speed in ecef during ascent from Coriolis, greatest at apogee. It goes back down but is always positive westward
<discord-> e​gg. — So you land West.
<discord-> e​gg. — Coriolis.
<discord-> S​tandecco. — Oooooh, right
<discord-> S​tandecco. — It goes from 0 to max to 0
<discord-> S​tandecco. — But integrating you get westwards drift
<discord-> e​gg. — Same as braking does not bring you back to your starting point
<discord-> S​tandecco. — Of course, you're completely right
<discord-> B​utcher. — In theory at the poles you could land back at your starting location.
<discord-> D​amien. — spacex doesn't want you to know this weird trick
<discord-> e​gg. — But you would annoy the penguins so don't
<discord-> e​gg. — Also the Principia polar elephant
<discord-> l​pg. — does it matter which pole the elephant is at?
<discord-> S​tandecco. — of course, which penguins would he talk to if he were in the north pole?
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<discord-> B​uilderbast. — Isnt coriolis just that if you go higher in a circular motion the horizontal velocity stays the same, but your angular velocity decreases
<discord-> B​uilderbast. — Since you need to cover more distance the higher you go to cover the same angle
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<discord-> p​uma949. — does principia calculate the orbits and save them of all the debris?>
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<discord-> D​amien. — Yes
<discord-> D​amien. — Potatoroids too so get rid of those to reduce load
<discord-> p​uma949. — it seems weird, trying to preveng "hacking" by calculating for debris but making the save kinda unplayable after some time
<discord-> p​uma949. — oops I reinstalled for a .ckan and now I have both persistant rotation and principia, I think I will fix it before launching a craft
<discord-> D​amien. — I'm not sure if history is saved for roids and debris but their trajectories are calculated
<discord-> p​uma949. — ramoving 3 craft with 1000days history (the first craft of my space program) reduced save size by about 40%(80MB)
<discord-> e​gg. — > trying to preveng "hacking" by calculating for debris
<discord-> e​gg. — Not sure what you think we are trying to do but you sound confused. We are not trying to prevent anything, we just compute the motion of things, that is what Principia is for. We also store the history, the main rationale here is that it looks good on Reach’s videos. We are working on dealing with the effect on savefile size.
<discord-> p​uma949. — The mod is great, I ment that if debris would have been exluded there could have been a ""station keeping" bug, kinda like kerbalism doesnt use power for probes that are marked as debris
<discord-> e​gg. — ... I guess? This seems like a slightly convoluted line of reasoning, debris are not excluded because they exist, and everything that exists has to obey the laws of physics
<discord-> p​uma949. — that is a great reasoning, the only issue is that computer calcutation may be expensive in differnet ways, CPU/ file size. but Im sure there are good solution without loosing the main reasoning behind the creation of Principia
<discord-> e​gg. — file size is a different question from computational cost, that comes from keeping the history; arguably the history of debris is not that useful, but this just comes from the fact that there we make no distinction between vessels.
<discord-> p​uma949. — just as some pointed the big file size results in random freezes for a second or two every time the game is doing a save
<discord-> e​gg. — And I have pointed out, we are aware of this, there is an issue that tracks it (https://github.com/mockingbirdnest/Principia/issues/2400), and we are working on it. This will take several months. I recommend patience and getting rid of old useless vessels.
<discord-> p​uma949. — thanks for the great work and for all the detail in a great physics simulator
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<discord-> p​uma949. — there is still a weird iteraction between principia(at least Galileo) and mechjeb
<discord-> p​uma949. — I will check it again with Galilei and see if its only SmartA.S.S or SAS as well
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<discord-> p​uma949. — looks like RСS issue didnt replicate this time 🙂
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<discord-> s​cimas. — Loving the rebase in flight plan, and the usefulness of body centered parent aligned frame is the best thing I learned recently.
<discord-> s​cimas. — Could we have a "delete flight plan" button at all times in the flight planner? Deleting maneuovers seems to cause a lot of recomputation or re-rendering of the trajectory. And if the trajectory happens to wrap around tightly around a body, this causes a lot of lag / freezes for long flight plans.
<discord-> R​urouniDonut. — Principia uses multiple cores right?
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<discord-> D​amien. — I believe so
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<discord-> B​utcher. — Yes
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