![]() We also need (which I am working on) non-probe-core satellites that can transmit science but not be controlled, and which would be very light indeed. 64^3 (it's the cube rule: mass is cube of volume), which is darn close to 1/3. Now it transpires that pods, at least, in KSP, are quite close to the mass they "should be", as are the probes we build (they're maybe heavier, actually). ![]() Now it just so happens that a flat multiplier of 6x works pretty well here, yielding TWRs of 30 (about right for a tiny vacuum engine) to 60 (upper stage) to 102 (lower stage) to 150 (Merlin 1D, best TWR ever).Ĭonversely, that means dividing engine mass by 6.įinally, payload. If the tanks were just tanks, as Starwaster calculates, rather than 2 tanks + outer skin + misc structural mass, then it does seem reasonable the ratios would be off by a factor of 10, not ~5.Įngines in KSP have TWRs in the range of 5 (the LV-1) to 10 (LV-909, Poodle) to 14-17 (LV-Ts, Skipper) to 20 (48-7S) to 25 (Mainsail). Note that the volume ratio is about 1/4.7 stock (stock is 0.000625, or 1/1600), and the mass ratio is about 1/4.5 stock (stock is 0.11111, or 1/9). Its dry mass is slightly lower to account for a 0.4t decoupler. The fake Titan I uses the 64% rescales (real:KSP), and a rescale of 1/3 on engine mass (close to. In addition, it's nice because it has not much in the way of thrust plates or heavy interstages or guidance, and it's easy to see on a cutaway that the fuel tanks take up most of the internal volume of the stage.ĭiam Height MassğmassĞhgtĞmassĞnum Volĝry Mass Mass/KSPVol Mratio (dry:dry+fuel) I figure as one of the first missiles, and not a tank-is-skin job like the Atlas (that to this day has one of the best dry:wet ratios ever), it's a good minimum baseline. So, let's talk about the Titan I (the kerolox version) and its first stage. I then did some basic guesstimates when considering that KSP tanks are not actually tanks, they're stages with tanks inside. (Note that in stock KSP, tank mass ratio is 0.1111) I was responding to Starwaster, who found that for the actual tank (not the whole stage structure, the tank) for RP-1 on the S-IC, dry mass was approx 11 tons and there was approx 622 tons of RP-1 in it. To resume the discussion from StretchyTanks thread, here's what I have so far: mass for given thrust) and third, payload mass. First, fuel tank dry mass second, engine TWR (i.e. If we accept 64% scaling, which seems reasonable so as to not overload PhysX, and which most modders who add real-life parts ascribe to, then we also need to scale masses of payload if we're using KIDS, as otherwise our rockets will be utterly ungainly and way-worse-performing than real life. So, between KIDS, MFS, DRE, FAR, RT, we're getting closer. This is to combine separate discussions in the KIDS thread, the StretchyTanks thread, the usual chatter in Modular Fuels, etc. For the mods based on this, see the Realism Overhaul thread and the Real Solar System thread in Addon Releases
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