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UDMH is a Spaceflight Simulator roleplay, meant to be fairly realistic. Each RP member assumes the role of a real or fictional space agency. The RP starts in 2025 (in-game time), where each agency starts with orbital launches before moving into more and more ambitious mission envelopes. This...

Lemniscate Biscuit and I were trying to figure out what percentages you'd need to fill tanks in SFS to match real world LOX/LH2 densities, and we came across something interesting. Given a density of 350 kg/m³, the fuel percentage to match what the mass a tank of hydrolox should be is a linear...

The Säanger spaceplane was a very cool project from West Germany in the 90s. Sadly it was abandoned as most cool space things are. It's named after the German scientist Eugen Sänger who came up with a similar concept of a 2 stage suborbital bomber called the Silbervogel (Silver Bird) that would...

NASA released their 2026 budget proposal recently, and long story short it's slashing a tonne of science missions, including CHANDRA probably and MSR for sure. This is obviously bad news, because it severely restricts what we learn about space. It's pretty much up to ESA to pick up the slack...

I've been having an issue for the past couple months where two of my engines are causing the issues that are usually caused by an empty reference in a flame holder, but my flame holders are fine. There's also a funny window that pops up when I close the game (attached). To me (based on the...

I was working in the lab, late on night When my eyes beheld an eery sight The YF-23 from its slab did rise And suddenly, to my suprise... It had a lovechild with the F-22 and the F/A-XX. Welcome to the world, McDonnel Douglas/Northrop-Grumman/BAE Systems beauty without name that I'm personally...

Recently I've been taking a break from SFS, having played it way too much, and finally got into KSP for real. Thinned my modlist from 200 heavy hitters performance wise to only 120, got volumetric clouds, everything a good, sane, law-abiding KSP player should do (looking at you RP-1 players)...

This is for my projects, builds and the occasional cool concept I stumble across while scouring the NTRS database.

Well, I decided to have a look at the SFS forums on Wayback machine. Pretty interesting, and I ended up nostalgic for something I never experienced. Anyway, the earliest snapshot was back on May 18th, 2019. Mooncrasher was editing save files and exploring the universe And that abruptly...

I was recently researching Principia, and I was wondering how difficult it would be to make a Principia style mod that added N-body physics to SFS. Would the 2D nature of the game impede it? Obviously I would have to somehow gut the current physics engine and make a new one, but is it...

Advanced Engines Pack Mars Transfer Vehicle by zTallsRobot This pack contains some engines well suited for interplanetary and interstellar journeys. All engines are based closely off of real designs and concepts, and I'm always happy to hear suggestions for new engines/improvements. All the...

I've noticed even in a vacuum with torque disabled and no SAS, a spinning object will slow down. Is this unavoidable or a setting? Or is something going on with my specific game?

Whenever I try to install a texture pack, it doesn't work. I put the folder in the directory, but the textures don't show up. Can anyone recommend anything?

I'm just gonna post my orbiter stuff here

What is the mass of earth in realistic? I want to calculate an orbital period.

No one seems to do this one... For mine, I ruled out replaceable parachutes instantly (too much work), as well as propulsive landing (needs too much fuel, not enough time for the second stage to get to orbit), and went with airbrakes: Near the top of each stage are grid fin looking solar...

Build grid: Launchpad: Booster seperation: Second stage ignition: 20t to LEO: Second stage still has enough fuel to go to high earth orbit.

Can anyone recommend some orbital mechanics textbooks, preferably not too heavy on the calculus? I hear I may need them for KSP.

First: I can't find anything on how to make planet packs in 1.5. Is it the same as 1.4? Second: Are there any other levels of planet editing besides the team totan one? If so, what do they require?

Should I get KSP 1 or 2? KSP 1 is on sale right now, but KSP 2 looks like it adds quite a bit.

The Thrust 4 is a Delta IV Heavy-like vehicle that was designed to take 50t to orbit in realistic. Have fun! Thrust 4

I'm brand new to modding, but I'm going to make a custom.engines pack with a vast assortment of interplanetary/interstellar engines. I'll be using this thread to post updates and take SOME requests, not all (who knows, though). So far, I have this list of engines: (N2O4's electricity pack will...

I want to make some custom engines that haven't really been explored yet, but I need the tools first. I downloaded unity and made an account, but I can't figure out how to mesh it with the modding toolkit. I am dreadfully new to this (everything) so can anyone help me?

I recently started playing realistic and wondered if there was anything I should know about getting into orbit (LEO of course)

Let me play among the stars (Payload): And let me see what spring is like (Shuttle stack): On Jupiter or Mars (Launchpad): In other words... engine ignition and roll: Booster detach: Core stage 2nd burn - LEO injection: Core Stage detach, Orbiter engines ignite to finish burn: LEO...