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Elington

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Posts posted by Elington

  1. Hi @ShotgunNinja,

    Thanks again for Kerbalism, wouldn't play KSP without it!

    I just wanted to report that unless I'm mistaken it may be introducing some frame rate stuttering (I compared the game with and without it installed). This is not a degradation of the peak frame rate but rather a slight pause every few seconds. IMHO this could be due to the Garbage Collector having to reclaim too many short-lived objects (.NET GC performance, the Mono GC is slightly different but the same rules apply I think). I just had a very quick look at your code and I noticed that you seem to use the "+" operator on strings for instance. This is a source of a lot of such objects (strings are immutable and each "+" operator actually generates a single use new one) and may be related to this little issue? 

    Just my two cents :)

    Cheers, David

  2. That's spaceflight for you; a bit more fuel will do wonders and it's a big part of the reason why you can't simply clamp a player's achievements to tech tree advances. You need some sort of other limiter, like life support, to make those in-between steps more important.

    Simple rules for interplanetary flights and working with the stock game (sorry I can't find the thread where I first saw these discussed):


    1. manned ships must carry at least 3 kerbals
    2. manned ships must carry 1 hitchiker module per 3 kerbals and per mission year rounded up (must be brought back to Kerbin)

    I generally rely on alexmoon's launch window planner to estimate the duration of the mission.

    Believe me this leads rather brutally to extra DV and ship complexity, and which increases with the distance flown! :D

  3. Probably a false positive but Chrome is reporting the .zip download as malicious. Let's all be careful out there.

    Hi Pecan,

    For the record the PC used to build that thing is protected by a genuine and up-to-date KAV 14.0.0.4651 (current build). And I always check the files explicitely before release. Anyway you're definitely right that every one should always be very careful!

    Cheers,

    David

  4. Hi,

    If that can help I worked on this app when facing the same question: Ascent Komputron - rocket simulator, ascent optimization, aerobraking

    It can simulate and optimize the trajectory of a rocket model taking into account thrust, gravity and drag (stock, not "FAR"). If the vessel can make it to orbit you get a reading of the total spent DeltaV together with the drag, gravity and steering losses.

    Cheers,

    David

  5. These techniques are perfectly realistic within the game physics.

    Real life rockets are not meeting any aesthetics criteria with anything but their paint. Everything else on them is made to achieve maximum effectiveness in real physics.

    Asparagus staging is the same approach applied to KSP physics. Effective KSP rockets look different from real life rockets, because physics are different.

    Perfectly stated IMHO.

  6. Hi All,

    Kerbal Petroleum and the Ascent Komputronics Society are happy to present the "KST Nabukodonosor" supertanker!

    KST Nabukodonosor "B"- large docking port

    Payload specs:

    Total mass: 533.3t

    Available fuel on orbit: 448t (= 14 jumbo-64 tanks)

    Monopropellant: 2250L (about 1/3 spent during the ascent)

    Payload.jpg

    Orbital maneuvering configuration (discarding the last launcher stage fuel reserve):

    Payload + 1 jumbo-64 tank + 1 Mainsail engine => available DeltaV 185 m/s

    Manoeuvre.jpg

    Launcher specs

    A. Structure

    974 parts

    3870t takeoff mass (dry mass = 1150t)

    Asparagus layout, in jettisoning order:

    - 4 stages of 6 lateral boosters each (4 x 6 x [2 x jumbos-64 + 1 x Mainsail]),

    - 2 stages of 6 main lift elements each (2 x 6 x [2 x jumbos-64 + 1 x Mainsail]),

    - 1 central stage of 6 main lift elements (1 x 6 x [2 x jumbos-64 + 1 x Mainsail])

    Structure.jpg

    B.Performance (Ascent Komputron design and analysis)

    TWR: average 1.75, min 1.4

    Fuel reserve at 100 km circular LKO: 60t (among which 32t from the orbit maneuvering stage) for a total of about 335m/s of DeltaV (with no loss of payload)

    AK.jpg

    C.Test Flight

    Flight Plan (Ascent Komputron's optimizer result)

    FP.jpg

    Boosters jettisoning sequence

    BoostersJettisoning.jpg

    BoostersJettisoned.jpg

    End of injection phase

    FinInjection.jpg

    Final orbital data: 508.8t of fuel = payload fuel + 60.8t reserve

    Orbit.jpg

    Thank you for reading :)

    David

    Ascent Komputron topic: http://forum.kerbalspaceprogram.com/threads/59899-NET-AscentKomputron-rocket-design-%28reads-craft%29-ascent-optimization-aerobraking

  7. A simulator for a simulator...ok then.
    Well for real-life IC design (microelectronics chips) you need a System simulator, a Schematic-level simulator, and a "back-annotated schematic" i.e. Layout-level simulator, all simulating the same electronic circuit at different levels of abstraction... so don't you dare complain at level 2! :D

    Edit: working on the Ascent Komputron, I do support the idea of course, but I understand some players don't want this :)

  8. A way to test designs at far flung places without having to take the time to get there. Great for testing a design out in career mode without having to spend the money (once it is in the game).

    Hi DJRWolf,

    I don't want to interfere and IMHO all playing styles are good provided they give fun to the player! :)

    However I'm jumping in because your concern is exactly what drove me to work on this:

    http://ascentkomputron.blogspot.fr/

    Forum:

    NET-App-Ascent-Komputron-rocket-design-tool-and-ascent-trajectory-optimization

    I can't say it will solve all the test cases you mentioned but at least it got me to Eve's surface and back right on the first design trial. I'm currently working on a .craft import feature to make the design description much easier (should be ready within a week).

    Please don't hesitate if you have any feedback and suggestions,

    Happy flying,

    David

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