Jump to content

Leganeski

Members
  • Posts

    154
  • Joined

  • Last visited

Community Answers

  1. Leganeski's post in HELP: Not 2.7k dV not enough to capture laythe? was marked as the answer   
    This is probably the most important part. Because Laythe orbits so quickly, it's really important to meet it in exactly the same direction as it is moving around Jool, effectively allowing you to subtract off Laythe's full orbital velocity (3223 m/s) from your velocity around Jool. As it is, you're meeting Laythe about 60 degrees too early, which is always going to waste at least 1500 - 2000 m/s.
    Thankfully, the Laythe encounter problem isn't too hard to fix: you can make a correction maneuver halfway along the route to Jool which moves the entire Jool flyby about an additional two hours into the future. Keep adjusting it until the planned trajectory encounters Laythe just as it is about to reach its closest approach to Jool. This will save a lot of fuel when you reach Laythe, and 2800 m/s should probably be enough to complete the capture.
     
    As others have stated, another relevant thing to get right is the transfer to Jool. Although your transfer isn't terrible, and is likely good enough considering how much extra fuel you packed, encountering Jool in the same direction that it is moving will save even more fuel. If you line up both encounters well, it costs less than 500 m/s to capture at Laythe.
  2. Leganeski's post in HELP: Not 2.7k dV not enough to capture laythe? was marked as the answer   
    This is probably the most important part. Because Laythe orbits so quickly, it's really important to meet it in exactly the same direction as it is moving around Jool, effectively allowing you to subtract off Laythe's full orbital velocity (3223 m/s) from your velocity around Jool. As it is, you're meeting Laythe about 60 degrees too early, which is always going to waste at least 1500 - 2000 m/s.
    Thankfully, the Laythe encounter problem isn't too hard to fix: you can make a correction maneuver halfway along the route to Jool which moves the entire Jool flyby about an additional two hours into the future. Keep adjusting it until the planned trajectory encounters Laythe just as it is about to reach its closest approach to Jool. This will save a lot of fuel when you reach Laythe, and 2800 m/s should probably be enough to complete the capture.
     
    As others have stated, another relevant thing to get right is the transfer to Jool. Although your transfer isn't terrible, and is likely good enough considering how much extra fuel you packed, encountering Jool in the same direction that it is moving will save even more fuel. If you line up both encounters well, it costs less than 500 m/s to capture at Laythe.
  3. Leganeski's post in HELP: Not 2.7k dV not enough to capture laythe? was marked as the answer   
    This is probably the most important part. Because Laythe orbits so quickly, it's really important to meet it in exactly the same direction as it is moving around Jool, effectively allowing you to subtract off Laythe's full orbital velocity (3223 m/s) from your velocity around Jool. As it is, you're meeting Laythe about 60 degrees too early, which is always going to waste at least 1500 - 2000 m/s.
    Thankfully, the Laythe encounter problem isn't too hard to fix: you can make a correction maneuver halfway along the route to Jool which moves the entire Jool flyby about an additional two hours into the future. Keep adjusting it until the planned trajectory encounters Laythe just as it is about to reach its closest approach to Jool. This will save a lot of fuel when you reach Laythe, and 2800 m/s should probably be enough to complete the capture.
     
    As others have stated, another relevant thing to get right is the transfer to Jool. Although your transfer isn't terrible, and is likely good enough considering how much extra fuel you packed, encountering Jool in the same direction that it is moving will save even more fuel. If you line up both encounters well, it costs less than 500 m/s to capture at Laythe.
  4. Leganeski's post in HELP: Not 2.7k dV not enough to capture laythe? was marked as the answer   
    This is probably the most important part. Because Laythe orbits so quickly, it's really important to meet it in exactly the same direction as it is moving around Jool, effectively allowing you to subtract off Laythe's full orbital velocity (3223 m/s) from your velocity around Jool. As it is, you're meeting Laythe about 60 degrees too early, which is always going to waste at least 1500 - 2000 m/s.
    Thankfully, the Laythe encounter problem isn't too hard to fix: you can make a correction maneuver halfway along the route to Jool which moves the entire Jool flyby about an additional two hours into the future. Keep adjusting it until the planned trajectory encounters Laythe just as it is about to reach its closest approach to Jool. This will save a lot of fuel when you reach Laythe, and 2800 m/s should probably be enough to complete the capture.
     
    As others have stated, another relevant thing to get right is the transfer to Jool. Although your transfer isn't terrible, and is likely good enough considering how much extra fuel you packed, encountering Jool in the same direction that it is moving will save even more fuel. If you line up both encounters well, it costs less than 500 m/s to capture at Laythe.
  5. Leganeski's post in Prograde marker not moving was marked as the answer   
    Did you set the navball to orbit mode? If you don't, it will calculate prograde as surface prograde, which doesn't deviate from vertical until after you start turning.
  6. Leganeski's post in Delta-V Requirements for a Vall mission? was marked as the answer   
    Without any gravity assists, the cheapest route is a direct transfer from Kerbin to Vall and back.
    After reaching LKO, the ejection to Jool costs 1920 m/s, and the injection at Vall costs 980 m/s, for a total of 2900 m/s. After landing and rejoining the mothership, the ejection back to Kerbin costs another 980 m/s.
    If you have a more capable lander, you could theoretically save 260 m/s in each direction by parking the mothership in an elliptical Vall orbit, which would reduce the total Δv requirement of the mothership from 3880 m/s to 3360 m/s.
  7. Leganeski's post in How much fuel do I need for a fighter jet? was marked as the answer   
    The Panther in wet mode has an Isp of 4000 s. The exact fuel consumption depends on how long you use the plane for, but I'll take a wild guess and say you might need an average TWR of 0.4 for an hour. In that case, your plane would to be about 30% fuel by mass.
    That's a lot, but in practice, you wouldn't be using wet mode the whole time, which would raise the efficiency a lot, and a fighter jet might not need to be constantly executing maneuvers for an hour straight. If I made a fighter jet, I'd probably stick with dry mode the whole time (Isp: 9000 s), and run it for like twenty minutes before landing back down. Then the plane would only need to be 5% fuel.
    (Note that the number of engines doesn't matter other than letting you fly the plane at a higher TWR if you want.)
  8. Leganeski's post in how do i build a working plane? was marked as the answer   
    This is the only problem that I could see.
    Because the center of lift is so far back, it's constantly trying to tilt the plane downwards. On the ground, this means that the front wheel is supporting most of the weight of the plane, and one wheel isn't enough to maintain stability. In the air, your control surfaces are fighting as hard as they can to counteract the downwards tilt, and are just barely succeeding. When you use them to do something else like turning, they can no longer provide enough pitch torque, and the plane pitches downwards and crashes.
    Still, the fact that you managed to actually achieve level flight after only 10 hours is very impressive! It took me a lot longer than that.
  9. Leganeski's post in Help with FAR Mod please was marked as the answer   
    I'm not sure how exactly FAR works, but this is probably because you're flying really fast through dense air. The dynamic pressure on your plane at the time of the screenshot is about 132 kPa (assuming you're at the equator just before noon, which is what it looks like to me based on Kerbol's reflection in the water). In comparison, a typical rocket launch in real life reaches a maximum dynamic pressure of about 30 kPa, and even that's enough to cause significant structural concerns.
    When you're flying against that much pressure, slight pitch adjustments will cause the wings to start producing a huge amount of lift, and in this case, it's more than they can handle.
    There's a reason why planes don't normally go supersonic until they're high up in the atmosphere.
  10. Leganeski's post in Is it possible to run 2 planet packs at once? was marked as the answer   
    In general, it is possible to use multiple planet packs simultaneously: just install both of them. However, it is possible for two planet packs to have planets that occupy the same space, in which case those particular packs will not be compatible with each other.
    If you're using Kcalbeloh as a secondary system, it is quite far away, at a distance of 251 - 292 Tm away from the central star. No other planet pack that I know of occupies that range of distances, so anything should work fine with it.
    If you're using Kcalbeloh with the homeswitch, you can still add other planet packs as long as they don't also move the homeworld (i.e. GEP or OPM should work, but not Beyond Home). They will orbit Kerbol as usual.
    If you're using Kcalbeloh as a primary system, where Kcalbeloh takes the position of Kerbol, planet packs such as OPM that expect the stock system will not work. Other packs may work as long as all the systems they add stay far enough away from Kcalbeloh to avoid overlapping SOIs. Aralc's SOI extends to a maximum of 1.4879 Tm away from Kcalbeloh, so anything farther away than that should be compatible. For example, GPP Secondary (3.304 - 10.696 Tm) would work, while GEP (0.7 - 3.3 Tm) gets too close.
  11. Leganeski's post in Is it possible to run 2 planet packs at once? was marked as the answer   
    In general, it is possible to use multiple planet packs simultaneously: just install both of them. However, it is possible for two planet packs to have planets that occupy the same space, in which case those particular packs will not be compatible with each other.
    If you're using Kcalbeloh as a secondary system, it is quite far away, at a distance of 251 - 292 Tm away from the central star. No other planet pack that I know of occupies that range of distances, so anything should work fine with it.
    If you're using Kcalbeloh with the homeswitch, you can still add other planet packs as long as they don't also move the homeworld (i.e. GEP or OPM should work, but not Beyond Home). They will orbit Kerbol as usual.
    If you're using Kcalbeloh as a primary system, where Kcalbeloh takes the position of Kerbol, planet packs such as OPM that expect the stock system will not work. Other packs may work as long as all the systems they add stay far enough away from Kcalbeloh to avoid overlapping SOIs. Aralc's SOI extends to a maximum of 1.4879 Tm away from Kcalbeloh, so anything farther away than that should be compatible. For example, GPP Secondary (3.304 - 10.696 Tm) would work, while GEP (0.7 - 3.3 Tm) gets too close.
  12. Leganeski's post in Is it possible to run 2 planet packs at once? was marked as the answer   
    In general, it is possible to use multiple planet packs simultaneously: just install both of them. However, it is possible for two planet packs to have planets that occupy the same space, in which case those particular packs will not be compatible with each other.
    If you're using Kcalbeloh as a secondary system, it is quite far away, at a distance of 251 - 292 Tm away from the central star. No other planet pack that I know of occupies that range of distances, so anything should work fine with it.
    If you're using Kcalbeloh with the homeswitch, you can still add other planet packs as long as they don't also move the homeworld (i.e. GEP or OPM should work, but not Beyond Home). They will orbit Kerbol as usual.
    If you're using Kcalbeloh as a primary system, where Kcalbeloh takes the position of Kerbol, planet packs such as OPM that expect the stock system will not work. Other packs may work as long as all the systems they add stay far enough away from Kcalbeloh to avoid overlapping SOIs. Aralc's SOI extends to a maximum of 1.4879 Tm away from Kcalbeloh, so anything farther away than that should be compatible. For example, GPP Secondary (3.304 - 10.696 Tm) would work, while GEP (0.7 - 3.3 Tm) gets too close.
×
×
  • Create New...