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Found 10 results

  1. I created an SSTO which works fine in Kerbin atmosphere, has plenty of fuel to get into orbit, however, when trying to circularise the orbit and using the nuclear engines in orbit, the SSTO keeps on pitching up, even when all control surfaces are turned off. Any help please? The SSTO has a mass of 56.3k kg, 4900 units of liquid fuel and 880 units of oxidiser, with 4 rapier engines and 2 nuclear.
  2. In a plane the Centre of mass is just ahead of the centre of pressure, so it is stable. When elevator movement is given, it does go nose up but it doesnot climb. Instead in it tries to come down. How to make it climb. P.s Rhodes34 airfoil if used inclined at 8deg Basically I want to know what affects the rate of climb and vertical velocity
  3. Hey all, so I've been trying to build a mars tranfer vehicle somewhat in the vein of Hermes (from The Martian). For me, it's an 80 ton, crewed, ion propelled spacecraft. Unfortunately, when I got it assembled and fueled in orbit, I discovered that my mod install had reduced the thrust of the engines from 2 kN to 0.25 N which is 8000 times less thrust, and KER told me a 10 m/s burn would take 4 hours and change (8 engines). I am obviously going to have to rethink my plan, but that's actually not my main point of interest. \ All this got me wondering, how would a real world ion rocket leave earth orbit for an interplanetary transfer? I am very experienced with using multiple perigee kicks to make low thrust escapes, but the thrust of real life ions is SO low that this isn't possible. Even if I halved the mass of my rocket to 40t and tripled the number of engines, it'd still be more than half an hour for 10 m/s. At that rate, it'd take more than 300 kicks to reach escape velocity. I know that all real world ion spacecraft to date have been lauched into heliocentric orbits using chemical rockets, so I'm not sure it's actually possible to use such a low thrust system for earth escape. There are however, several hypothetical vehicles, both fictional and real concept designs, that do appear to exclusively use ion propulsion once in orbit. Does anyone know what kind of trajectory would be used? The only one I can think of is a very long spiral up to very high orbit, and from there on to deep space. However, I imagine this would eat up an absurd amount of dV, so it doesn't seem like a good option for anything except maybe a solar sail vehicle. Ion drives in stock are time consuming, but you can basically treat them the same way you would small chemical rocket engines like the LV-1. With realistic ion drives though, I don't have the first clue how to use them. Thoughts? Ideas?
  4. Nevermind this, I saw a thing called Firespitter. I know the engine and engine fx modules already exist but what do I put in my plugin code to make a part produce thrust? I'm trying to figure out how the stock engine module works but I'm having issues with that because I can't see the source for it. I at least know it increments/decrements a vector based on throttle and fuel input somehow and the api documentation at the wiki isn't showing the somehow.
  5. Don't you hate it when you have too much fuel/oxidizer laying around? Which you could change the mixture ratio that your engines use (like the J-2 did in real life)? Want no more. Introducing: EMRController With this mod, you can configure your engines to use different oxidizer/fuel mixtures, and have the ISP and thrust adjust accordingly. You can even set up your engine to run in "Closed Loop" mode, emptying your tanks at the end of a burn. This mod does not contain any configurations, but if you use Realism Overhaul, you'll see that the J-2 does have configurations that work with this mod. Download: Github View the Source cfg changes powered by sarbian & ialdabaoth's ModuleManager plugin. Changelog:
  6. Hi, I am currently modding the J404 Engine to fit it to my SU27 replica (might release as part mod eventually). I noticed something weird when I was editting the engine curves and trying them out ingame and this is true for Stock KSP engines aswell. The static thrust of the J404 is 130kN, @ Mach 2.5 it is supposed to be 219.5kN okay that is as advertised when you try it out. However when I look at the curves the thrustmultiplicator of the J404 at mach 2.5 is 3.5. 219/130 is a mere 1.8-ish of the thrust that the curve says. I thought the atmospheric curves play a role in this and might explain the vastly lower thrust, but nope even with a constant atmospheric curve the engine still is not producing the amount of thrust. What variable am I missing? What else is playing into the calculation of the thrust? I really don't want to make totally ridiculous thrust curves and have multiplicators like 6 or higher in there. (I hope this is the correct subforum to ask this)
  7. with a v simple craft using the MK1 cockpit. after going eva I realised that the craft was spinning. (when it wasn't before hitting the EVA button) so i got back inside and stopped the spin with some SAS. then the moment i hit EVA and my kerbal is holding the ladder the craft is spinning again. so i checked the map and notice that my PE and my AP are going down together at about 20meters a second. I've tested this out with a few similar craft but with no luck recreating it. but this one craft always does it. https://dl.dropboxusercontent.com/u/92121741/broken 1.craft this craft is all stock parts but the install does have mods this is the Ckan file. https://dl.dropboxusercontent.com/u/92121741/ckan list2.ckan Edit, I've been unable to recreate the problem with a brand new craft but if I use craft that was having the problem to begin with its always there even when I reorganise the parts of the lander and remake it with new bits it still spins. I also saved it under a different name and change the root part.
  8. I'm fairly new to the game and play on Xbox. I saw a video where someone set the max thrust of his solid rocket booster so that he had a thrust to weight ratio to his liking. When he left clicked on the booster to lower its thrust, there was a pop up that showed (among other things) his TRW. He was on a PC. Is there a way to view your TRW while you build your project on the Xbox version? Clicking on a booster only displays the Thrust Limiter and amount of solid fuel.
  9. Greetings all. This is going to sound stupid but, is there anywhere else that can cause thrust to show backwards in the game? I know its correct in Unity, I exported it and another part with the same thrustTransform rotation and the other one works fine. Any ideas? I might have been refrencing the wrong .mu. Any mod is free to delete this.
  10. Hi all, I've got a bit of an odd question regarding engine thrust. I'm designing an asteroid "puller" to bring in a Class E. I have my nuclear engines out on 4 radially-symmetrical nacelles, which were angled at about 45 degrees to try to clear the asteroid for unimpeded thrust. On my first attempt, the angle was not sufficient, and I had some of the engines (but not all) obstructed by the asteroid, leading to more asteroid-spinning and less asteroid-moving. So to address this, I tried to increase the angle of the engines (i.e., make them closer to perpendicular to the main axis of the ship). I tested out the new design on the launchpad, with gravity hacked and with just the core ship, not the orbital-launch rig. Results were not good- I was barely getting any thrust! In other words, it seems there's a thrust penalty for having your engines angled. I've looked on the forums for info on this and not seen much, but one person suggested the end-thrust is a function of the cosine of the engine angle. My question, I guess, is why. My (probably wrong) understanding was that, if you have two symmetrically balanced engines, as long as there was SOME angle in one direction, they would put full thrust forward regardless of the angle. Those engines' energy has got to go somewhere, and I presume it's not being lost to deformation or heating of the ship in between. If not, the only place the energy could go was forward. The analogy that comes to mind is: squeeze a wet bar of soap between your hands, it will shoot out straight up or in some direction. Not because you pushed it in that specific, but because it's got nowhere else to go when you apply a squeezing force. Can anyone explain what's causing the observed thrust loss? Is there just extra heat generation? Is the specific impulse of the engine affected somehow? Is it just something else? (By the way, if major engine angling is not the answer, I will probably fix my rig by either extending the "tail" so the ship is further in front of the asteroid, or putting the engines out on longer pylons). Thanks for any info you might have!