Each program experienced many failed attempts, but luckily these were unmanned missions and no Kerbals were harmed in the process. xD, Bah, that's not an excuse! In this case just try to make sure to burn in such a way that your periapsis remains close to this point. It represents the point at which you'd apply thrust if you had a sort of Platonically ideal engine that applied all the dV you wanted instantaneously. You want to get this angle right in order to escape the sphere of influence of your origin parallel to its own orbital prograde or retrograde heading. PreciseNode for Kerbal Space Program. (The planner's time value can't be exactly right because it's assuming a perfectly-circular, perfectly-equatorial orbit, and reality isn't that perfect. :). This app helps you set course for the different celestial bodies featured in Kerbal Space Program. The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. I'm not saying they don't matter, but rather that the optimal ejection maneuver node placement can be found without checking the angle value. I could probably do like.. 2 days and it would be fine, but I like to play it safe, and I overengineer everything slightly to give me a bit more fuel than required anyway. For my craft it is 7.51 degrees earlier, not 6 degrees. The new international Kerbal Space Program formed in the aftermath of the Kerbollo 13rescue, set out to answer long-standing questions of the universe for the rest of all Kerbalkind, and exploration of the Kerbol system began in earnest. Proceed with caution. (With one ship you could get closer to the window but I like to play it safe - and usually send a bunch at a time. A space-navigational aide for Kerbal Space Program.. See all the transfers that you could choose from your current location at a glance, including the time till the burn and delta V, and turn them into maneuvers with one click. The ejection angle is the angle, at which you want to start your transfer burn in your origin planet's or moon's orbit. Its small size and gravity well (comparable to The Mun). You see, I got gun-shy when my three-hundred hour career glitched permanently, and I suspected mod conflicts. Adjust the maneuver's time value up or down a bit until the ejection angle shown in Precise Node matches the one in the planner. Be sure to burn before your ejection angle, usually ~6 degrees earlier should help. For this reason, Nate Simpson, Creative Director of KSP 2 informed the community last week about the decision of releasing KSP 2 in 2022 instead of fall 2021. Straddling the burn time is a good enough approximation that even for longer (say ~1 minute burn from LKO) burns, you're still close enough that you only need the tiniest of correction burns mid-transfer to straighten things out. To be honest I dont know what the hell 'ion-propulsion' Means xD. Better than 0.1% deltav accuracy. Each orbit has some basic properties which characterize them. Ish. This will save you a lot or trial/error/quickload. Astrogator. I think. Provides a more precise widget for maneuver node editing. For a given craft, orbit altitude, and target planet, the above only needs to be done once. 3. I've been able to eye-ball Duna intercepts. Orbital inclination measures the tilt of an object's orbit around a celestial body. As for telling you the ejection angle required to reach a planet, try this. They set their sights and aimed their many boosters to Mun, Minmus, Eve and Duna. It ain't precise, but it gets the job done without stressing about ejection angles too much. Ejection angle chart: Once you have time warped til the phase angle is right, launched, and achieved ~100km parking orbit around Kerbin, wait till your ship is at the correct angle relative to pro/retrograde before you burn. Ensure the burn is enough to roughly meet the target orbit. Let's play/Tutorial series in Kerbal Space program, v0.90.0. Additionally, some information on the planet´s Atmosphere is included. Not quite as efficient, but less of a hassle :P. I'm not an orbital mechanics expert, but I think you do not really need to bother with ejection angles. Now do the burn again factoring in the error. Don't quote me on that. Because when you leave kerbjn SOI you still have some of its orbital velocity, to reach other planets efficiently you need to add or subtract your burn dV to this velocity. Alternis Kerbol, a KSP mod by NovaSilisko. 4. The page tells me when I need to burn, so I fast forward to let's say 5-10 days before the window and get to work. Powered by Invision Community. But the best way is to use Transfer Window Planner because it not only nails down the timing, but also the ∆v required for the ejection burn, and gives you an idea of how long your transfer window will last. Ion propulsion is just plain nifty.). Having launched reliable global communications, weather observations and top-secret intel, the Kerbicans and Kerbeits began planning for less material pursuits. θ or theta should reach zero or around 0.04 on the ground, then launch. It does not make sense that ANY craft size/engine combo should start the burn at a specific place. I did a report on ion-propulsion drives when I was in grade four. It was mostly my fault, because I had deleted all my saves, but still, I decided to see If I couldn't … Think Of It Simply, The Closer Your Periapses Is To A Planet/Moon, The Faster You Will Go And Therefore You Will Gain Enough Speed To Break That Objects SOI. You still have to mash your brain a little when it comes to figuring-out what your current ejection angle is though; just think of it as an angle relative to Kerbin's (or whatever celestial body you're orbiting) orbit around Kerbol, not your own orbit around Kerbin. 3. Set origin, set destination and you'll access important information on Planetary Phase angles, Ejection angles and Ejection burns. Set your node somewhere on the orbit, add some prograde delta-v to exit kerbin SOI and more, zoom out until you see your interplanetary course. Oh yeah, since that deflection from burn time is relative to your angular velocity, if you want to get more precise, you can always just lower your angular velocity by raising your orbit. Just kick enough delta-v at about the right place in the orbit and then tweak your destination after you've left your source planet's influence. When you're ready, time warp to the launch window with your ship in lko, Create a maneuver node anywhere along your LKO path, Manually enter the required ejection dV (which you can get from sites like this), as prograde dV for burn, Move your maneuver node around your LKO path until you get an encounter with your desired target destination (this may require further adjustments of prograde ejection dV). 2. Is there a mod for more accurate maneuver nodes that displays your ejection angle? Its atmospheric composition is thick enough to support aerobraking, yet also thin eno… After the burn is complete I then put in a new maneuver node let's say 10 minutes ahead of my craft, then I TAB until I get to Duna, and I play with that maneuver node until my Duna Periapsis is as close to the planet as I want. Like I said I do it 5-10 days before the window because I usually send a whole bunch of things at once. Not bad! This helped me to get to all the planets!! (Uh, actually a speech, and my poor classmates were terminally bored, but I didn't really care. I have used https://alexmoon.github.io/ksp/#/Kerbin/100/Eve/300/false/optimal/false/9/248 to calculate the launch date, but I am unsure of when to start my ejection burn.Olex has nice graphics on the same basic tool (https://ksp.olex.biz/), but I don't get much wiser because the text is confusing: "The ejection angle is the angle, at which you want to start your transfer burn in your origin planet's or moon's orbit.". Regex wrote this plugin to fulfill a singular request he had since he started seriously playing this game: the ability to see the ejection angle of a maneuver node. This campaign will introduce y… Then I put in a maneuver node anywhere around Kerbin and bump it up to a value close to the delta v needed. Acknowledgements. If I could learn how to find my ejection angle, and learn how to change it, then I would be a happy kerbonaut. It's very easy to use! I'm struggling with transferring efficiently. So now use an onscreen protractor to measure how much. How do I know what ejection angle I'm at, and how do I change it? You should now do the burn earlier at 158.91 degrees instead. With the Kerbal Alarm Clock you can create alarms for the following situations: Raw time alarms – created for either a specific date/time or a specific period in the future;; Manuever node – create an alarm based on the next maneuver node on the current ships flight path.This node will be stored and can be restored when you come back to the ship. ©2020 Take-Two Interactive Software, Inc. I'm running 1.12 so any mods suggested would have to be compatalbe with that version. Probes were designed and launched to the inner planets, and plans made for a Grand Tour of the outer planets at some point thereafter. and then look at how much delta V I need to get an intercept with the planet. Good Luck!! This has nothing to do with ejection angles; it's the Oberth Effect. http://kerbalspaceprogram.com, Looks like you're using new Reddit on an old browser. From left to right, make the numbers reach 0. Make fine adjustments to node dV or ejection angle as necessary to minimize required dV. The Mun's highest points reach a maximum altitude of more than 7061 m near the south pole at 152.33° W and 82.52° S. This altitude permits 10× warp, allowing crashes with terrain while being in a seemingly stable orbit. ... Edit: By remedy, i mean I've tried tinkering with the ejection force of the radial decouplers and with the value set to high it literally detonates the booster (or fuel tank) that is attached to it and to low it barely pushes anything away while in the atmosphere. My KSP career will now take off. Shows transfers for all main reachable spheres of influence, including from parent spheres of influence, not just bodies with the same parent 2. But i have no idea what that stuff means xD, I don't have my masters degree... Im kinda in fith grade? Eventually you'll get to a point where the ratio of the time it takes to make an orbit is huge relative to the amount of remaining burn for the transfer. What I do is use your first link (alexmoon) , put in the destination planet, origin and destination orbit, etc. Kerbin maneuv… Alright, I get the 'Interactive illustrated interplanetary guide and calculator for KSP' and I know how to get the angles. The resulting ejection would vary wildly. Quickload. So lets say you measure about 8 degrees, and this is a Duna burn from 100Kn up, that is stated as 150.91 degrees. Launch Window Planner for Alternis Kerbol has been forked from the Launch Window Planner by alexmoon. Kerbin Time (6h days, 426d years) Earth … Do your ejection burn at the proper angle as-per http://ksp.olex.biz/, using AdamKSP mod to know when to actually do it (note that I have found the mod buggy but still useful). Note that you probably will not be 100% correct still, but whatever error you have now will probably be less than a degree, just guess it for the next attempt... or get the onscreen protractor out again. The difference between fuel-efficiency and time efficiency can be learned by KSP. The Mun also features canyons which can be hundreds of meters deep and a few kilometers long. If the fourth grade thing is true your albert einstien. Make a guess node on the day side of the planet (for going to inner planets) or the night side (for outer planets). Usually to go to outer planets you burn at 90° clockwise so that you'll get more velocity added to your "kerbin velocity" and end in a larger final orbit; viceversa for inner planets you burn at 270° to subtract dV and end in a smaller orbit. If you haven't already, edit your game settings.cfg file so that CONIC_PATCH_LIMIT is at least 3 (4+ preferred, I'd say, but each step requires your computer to do more work), and possibly CONIC_PATCH_DRAW_MODE to 3 (at least that's my preferred mode as it is less taxing on my brain-meats). Add new mid-course maneuver node to further fine tune encounter (i.e. Information Changelog Stats. Its lowest point, below -247 m, is on the northern … Like, if you have an extremely low-thrust situation, like an ion thruster, that might need to burn for an hour, you just need to make a whole bunch of burns, giving you an increasingly more elliptical orbit that eventually hits the target... (the most efficient way), OR just lock your ship prograde and burn to basically maintain a circular orbit, but higher and higher altitude. Among others, I use Kerbal Engineer. I sent a fleet of 8 vessels to Duna using this method with no problems. Staging to be managed using whencommands from the main script. Luckily fuel is cheap on Kerbin, but I am starting to hit the boundary of SRB attachment points. This list contains multiple values which can be calculated using other properties of the list. Ejection angles and launch windows for interplanetary missions can be learned with KSP. A quick and easy guide for getting out of Kerbin orbit and to Duna. Is there a feature in there that would display ejection angles for a burn? This app helps you set course for the different celestial bodies featured in Kerbal Space Program. Kerbal Space Program 2 is a very ambitious project and everyone at Private Division and Intercept Games is committed to delivering the best possible experience to KSP fans. NEW! In practice with ordinary sort of thrust/mass ratios, starting the burn so that you're midway through it at that instant works out OK. This app helps you set course for the different celestial bodies featured in Kerbal Space Program. It's very easy to use! I'm trying to go to other planets, but I'm having trouble with the transfer (like everyone else). The ejection angle shown by the online calculator assumes an instant change in delta-V. It's very easy to use! However, real craft have a burn time, so you need to start earlier. Now... your ejection angle will be wrong, as expected, because your burn was not instant. :), More posts from the KerbalSpaceProgram community, Continue browsing in r/KerbalSpaceProgram, The Kerbal Space Program subreddit. Launch Window & Flyby Planner for Kerbal Space Program. NEW! For all your gaming related, space exploration needs. Like 12 hours to orbit vs. an hour long transfer burn, and now you're back to being able to do it in one shot, at the transfer angle. http://ksp.olex.biz/, Don't worry, I promise it is a safe, virus free site. What I'm not clear on is how to get to that from LKO. Light, efficient space travel coming up!! Stop the burn when your Ap is at the target orbit height as seen in Map View. The proper ejection angle depends on the TWR of the craft. Think of it instead as the point where you want to put your periapsis. The Mun's terrain is rough, grey, and scarred by craters. >_< none of the on screen protracters I found work on mah computer. Then, you can move the maneuver node around and see the effect on your orbit, and you will see that it will change widely, and that there are positions where the same delta-v gets you further away. So, if you're doing a mid-course adjustment anyway, there's not a lot of sense in being too anal about your initial burn. Date format. It is expressed as the angle between a reference plane and the orbital plane or axis of direction of the orbiting object.. For a satellite orbiting the Earth directly above the Equator, the plane of the satellite's orbit is the same as the Earth's equatorial plane, and the satellite's orbital inclination is 0°. This mod is not known to work with the latest version of Kerbal Space Program. AdamKSP is good, I picked a protractor off the the somethingawful forum's KSP thread when the servers were all down. Additionally, some information on the planet´s Atmosphere is included. What's with the sticky Shift key you have? It's a bit less efficient but meh). The amount of deflection you get is essentially relative to the burn time relative to the angular velocity around the body you're orbiting. ; And of course Kerbal Space Program for motivating me to finally learn orbital mechanics. Because when you leave kerbjn SOI you still have some of its orbital velocity, to reach other planets efficiently you need to add or subtract your burn dV to this velocity. Now zoom back in and observe the ejection angle. match plane, set encounter periapsis position, etc). Should I aim for a burn that shoots the vehicle out in the Ejection Angle? Obviously timing, inclination and parking orbit shape change the angle quite widely so a calculator can help you to predict it. The ejection angle is, as you see in your picture the angle between the kerbin prograde direction and the point of your vessel orbit burn point. Provides a library of scripts for 1. launching with atmosphere and in vacuum (ltoa, ltov). Whenever the map view is open and a maneuver node exists for the currently active vessel, the PreciseNode window will show. The ship triangle is where you would place your maneuver node.After you place the maneuver node, input the values for the necessary prograde Δv (and any normal / antinormal Δv required for some interplanetary transfers).After you do the above, your resultant trajectory should fall somewhere in between the gray shaded area as depicted.You will need to make minor adjustments to get the encounter with the planet based on how much your actual Kerbin orbit differs from the orbital altitude you used for the calculation on the site. However, real craft have a burn time, so you need to start earlier. Its low-lying areas tend to be darker in colour. See this KSP forum post for all of the latest information about this modified version of the Launch Window Planner. Do I need to be hitting the angle precisely when I reach escape speed? Prograde is the vertical line coming out the top, retrograde is the line out the bottom. 3. land in vacuum (landv), same script for Mun and Minmus 4. highly accurate maneuver node execution program (exenode). This campaign presents a mission manifest for taking your first baby steps out of Kerbin's SOI with sa… NEW! You're going to generally need a correction burn anyway, since for these big transfers, without using some fancy auto-pilot like mechjeb, it's impossible to be precise enough to exactly get a perfect transfer, and the game itself is probably just not high enough precision to make that work reliably. "The ejection angle is the angle, at which you want to start your transfer burn in your origin planet's or moon's orbit.". It is perhaps the ideal planet for interplanetary voyages for several reasons: 1. See below: This video I made many years ago may interest you, REALLY helpful! For my craft it is 7.51 degrees earlier, not 6 degrees. Set origin, set destination and you'll access important information on Planetary Phase angles, Ejection angles and Ejection burns. ... and also see the ejection angle of the maneuver from the orbited body. Its low orbital eccentricity. After the first one got an intercept with Duna it was easier to do the rest, since I could see where the maneuver node had to more or less go. 5. Phase Angle: -87.95° Departure Burn: 1984.45 m/s prograde. Additionally, some information on the planet´s Atmosphere is included. The ejection angle is, as you see in your picture the angle between the kerbin prograde direction and the point of your vessel orbit burn point. Your alternate choice is to wait until people with more knowledge of programming and orbital mechanics come-up with a solution that allows very easy interplanetary transfers. The KSP calculator site talks about reaching escape velocity at the ejection angle, but if I burned early (before apoaps) to reach the right velocity, wouldn't that then screw up my ejection angle? Right here, dude! All to advance science...or get you your satellite TV. They figured it was time to start exploring beyond Kerbin. Yet another maneuver node editor. ©2020 Take-Two Interactive Software, Inc. If you have a particularly low thrust engine, you might need to do multiple passes. Handles "nested" ejection burns, such as when you need to burn at the right time … Gravity assists work, and can be very useful. Its close proximity to Kerbin. To work out what the ejection angle adjustment is... you will need to use my super special secret trick. Supports transfers to vessel's target, regardless of what it is 3. However, I'd encourage you to at least try to learn the basics of this stuff. So higher thrust gets you closer to the optimal ejection. The low level way is to look at the phase angle from Kerbal Engineer.. A simpler way is to use Kerbal Alarm Clock to tell you when the ejection burn should be.. (Precise Node shows the maneuver's ejection angle at this point.) Thanks for all your helpful comments on how to use maneuvre nodes and To Stop Worrying About the Ejection Angle. That's what you aim for. Ejection angles, shows the ejection parameters in case the orbit escapes from the SOI of the celestial body; Orbit Info, shows the parameters of the planned orbit; Patches Control, allows to change the mode of Patched Conics draw, i.e. Mission parameters. Press question mark to learn the rest of the keyboard shortcuts, https://alexmoon.github.io/ksp/#/Kerbin/100/Eve/300/false/optimal/false/9/248. I saw that site, but my issue is that I don't know what tells me my ejection angle. To be clear, the angle you are measuring here is between your escape trajectory, and the orbital path of the planet. 2. yeah this is what's up. That's a concept a lot of people struggle with, but in KSP you can try it out and see how that works. Then I rotate the maneuver node around Kerbin until I get that intercept. ; Robert Braeunig's excellent Rocket and Space Technology which provided most of the math powering these calculations. I think this is just wrong. It's a good challenge, and it will give you a greater appreciation of the things scientists on the ISS, and at the world's various space agencies, do every day. Calculations are based on instantaneous thrust, and by "straddling" your burn around that singular point, you get a very good approximation of that. Alex Moon for the original Launch Window Planner for Kerbal Space Program; Team Galileo for the JNSQ solar system; OhioBob for Grannus Expansion Pack (and additional help with calculating body/orbit parameters) Launch Window Planner by Alex Moon is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. 2. landing orbit with periapsis 30 degree off the zenith (landnode). Anyone wanna help out with a link? If you were using, say, ion engines with realistic TMR, the assumption that the transfer burn is quick breaks down altogether. Usually I'll be really close but not quite, so I find a good spot for the maneuver node, and then poke at it slightly until the intercept clicks in. 5. orbital maneuvering (aponode, perinode) 6. Kerbal Space Program. Ejection angle you can easily do by eye. The proper ejection angle depends on the TWR of the craft. It is likely your next logical step after landing on the Mun, Minmus, or Eve. 1. Enables landing on the sunny side. Using a protractor to measure the exit angle or whatever is what I used to do and that could be more efficient.. but.. if you want even more efficient just follow my steps, but closer to the recommended transfer window. The discrepancy in the Phase Angle result comes from the issue I mentioned earlier, and -87.95° was the closest we can get to -65.15° while still being lined up with the comet’s apoapsis. So I basically zoom out on the map screen, and just estimate, (sorry I couldnt be more help, it is tricky business). Used and licensed under a CC BY-NC-SA 4.0 license. Will try this next time. Plus. Actually it's easier done than said, try to play with your manouver nodes and look how your orbit prediction change. Ejection Angle: 115.51° from prograde. Duna is Kerbin's second closest neighbor. Set origin, set destination and you'll access important information on Planetary Phase angles, Ejection angles and Ejection burns. Olex's beautiful Interactive illustrated interplanetary guide and calculator which inspired me to create this tool as a web page. 4. * adjusted angle names, etc to make em consistent - to retrograde, to prograde, etc * fixed issues with log spam and map view (Issue #35) * fixed issue with KACAlarms and margins (Issue #38) * Added new Angle Renderer to display phase and ejection angles ```KSP Version: 1.0.5``` The ejection angle shown by the online calculator assumes an instant change in delta-V. Menial data entry by toadicus. Then I do the required burn and that's it, I have a great path to Duna with no other work needed except a burn when I arrive.
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