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DDE

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Everything posted by DDE

  1. DDE
    TBH none of the above is to any degree official. They’ll still run a formal comission that will rubber-stamp Lavochkin’s admission of guilt five years from now. Or they’ll designate the programmer a Ukrainian spy. Can’t tell with our guys.
  2. DDE
    At this point, I really wonder why Sogaz and Ingosstrakh aren’t more involved with the manufacturers. How hard would it be to get TS-CI clearance to get inspectors onto the factory floor?
  3. DDE
    Lavochkin now says someone literally forgot to program the nav system for Vostochny... despite Fregat already flying out of two locations on a regular basis. http://www.russianspaceweb.com/meteor-m2-1.html#culprit So... yeah.
  4. DDE
    I've always wondered if it's possible to create a nuclear railgun shell that doesn't require a chemical implosion assembly. I don't doubt californium exists, I just doubt this was ever went into such an advanced stage.
  5. DDE
    What about pumping nanoscale metal dust, specifically reclaimed Lunar regolith aluminium, in liquid oxygen? Heterogenous monopropellant, what could possibly go wrong!?
  6. DDE
    Highly tabloidal, possible derivative of an April 1st PopMech article. The radioactive decay issue should have been too obvious to even start going. No, this part is the most impossible one. The smaller the nuke/thermonuke, the higher the radiation/blast ratio; that includes both fallout (larger bombs are more efficient at reacting their fuel) and the neutron emission - micronukes like the Davy Crockett are inherently neutron bombs. So, no, it’d be decidedly unsafe to throw.
  7. DDE
    You’re preaching to the converted. Even though there are nutters who experiment with mercury propellants in an attempt to get obscene mass ratios.
  8. DDE
    ...and, as a rule, oxidizers are heavier than NTR propellants. Which is what I meant. In pure theory. IIRC as a chemical monopropellant mono-H has ISP in the 2500 sec region.
  9. DDE
    NK’s ambassador boasted to the Russian press that the warhead is supposed to be ‘superheavy’. Very specific, I know.
  10. DDE
    On top of that: SCNTR chamber temperatures are lower than many chemical motors. It has to win at ISP primarily by not having oxidizer... although the massive increase in propellant density found in my LANTR designs has been an interestig effect. Hell, I can get more ISP from a craft of the same size - which, given how huge LH2 tanks can get, is not insignificant.
  11. DDE
    All sources have largely written off the launch. *sigh*... https://m.lenta.ru/news/2017/11/28/lezutnanebo/ “Launch Failure Blamed on Inadequate Consecration by Bishop” GYYYYYYYAH IVAN WHERE IS MY CHAINSWORD!?
  12. DDE
    Anonymous source: someone botched the vector for the first Fregat burn, Meteor currently exploring the bottom of the Atlantic: http://www.interfax.ru/russia/589367
  13. DDE
    The longer the halflife, the less radioactive the isotope is and hence the lower its specific power. You’d need a hilariously big pile of the relatively short-lived artificial U-233, never mind U-235, to produce meaningful voltage.
  14. DDE
    Roscosmos ground control failed to find the tug-payload stack in target orbit. https://www.roscosmos.ru/24385/
  15. DDE
    No comms with, or status on, the primary payload. https://www.rbc.ru/society/28/11/2017/5a1d23689a7947321acca71f
  16. DDE
    A quick glance through the apex of reliability, Wikipedia, suggests the events too place over the timeframe of tens of minutes. From what I heard full nuclear plant shutdown/start-up requires up to a day.
  17. DDE
    Or you can have triple the ISP and cause the spent fuel to reach solar escape velocity, or, the opposite, drop into the sun. Just use an open-cycle gas-core.
  18. DDE
    Shouldn’t a simple rocket-assisted retrograde core dump early in flight already send it way off course?
  19. DDE
    It's already found its way into both Time of the First and Salyut 7 films. https://meduza.io/shapito/2017/04/05/vremya-pervyh-start-voshoda-2
  20. DDE
    Cargo Soyuz nosecones always seeemed hilariously oversized to me.
  21. DDE
    Observe the falttie Shapeshifting Lampshade in all its glory!
  22. DDE
    Apparently that, and structural loads, yes.
  23. DDE
  24. DDE
    @Geschosskopf @Grand Ship Builder As some people point out, if it promises you hoverboards, it's probably gonna crash and burn. And ARCA started as a hoverboard company.
  25. DDE
    No, I suspect they actually meant dumping the reactor, or a major chunk thereof. Early NERVAs were rated for one burn anyway, hence multiple NERVA stages in some designs. In hours to days. These things take quite a while to throttle; that's why its likely any atomic rocket will have a Chief Engineer between the pilot and the actual reactor controls.
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