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Post by boomertiro on Sept 28, 2016 1:08:49 GMT
That's it, that's my issue. Trying to get passed the mission Uranian Cargo Run and I am once again cursing my reliance on KSP skills that do not at all translate to this more realistic but also time skipping turn based style space travel. I think I need a hohman transfer mainly due to my limited delta V and the distance and speed of the two locations as well.
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Post by boomertiro on Sept 28, 2016 18:28:54 GMT
Ok I got it. I could still do it better but I got it.
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acatalepsy
Junior Member
Not Currently In Space
Posts: 97 
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Post by acatalepsy on Sept 28, 2016 18:54:45 GMT
The main thing this game is missing is the ability to "slide" a specific maneuver around on the track. Often you know how you want to thrust (3 km/s retrograde) but not where (or when; the same thing in orbital mechanics). This makes doing transfer orbits frustrating; ideally it will be in a future version, but for now doing that kind of transfer requires a bit of guesswork and iteration.
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Post by lelden on Sept 28, 2016 20:12:16 GMT
Hohman transfers usually happen at the apoapsis and periapsis of an orbit. (It depends if you have enough thrust for the burn to be near instantaneous I think.) Going from low to high, you burn tangentially, increasing your velocity until your orbit just barely touches your target orbit, and orbit to that point and do a second burn to make your orbit match your target's. Going high to low is the same except you're doing burns to decrease your velocity.
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Post by cardshark on Sept 28, 2016 21:41:52 GMT
The main thing this game is missing is the ability to "slide" a specific maneuver around on the track. Often you know how you want to thrust (3 km/s retrograde) but not where (or when; the same thing in orbital mechanics). This makes doing transfer orbits frustrating; ideally it will be in a future version, but for now doing that kind of transfer requires a bit of guesswork and iteration. If I understand what you mean, it can be perfomed perfectly by making the target your frame of reference. It becomes fixed within that frame and it become merely a game of moving the green and red sliders to get an intercept, no matter how wonky the trajectory looks it will make all sense again when getting back to the central moon/planet/sun as your frame of reference. |
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acatalepsy
Junior Member
Not Currently In Space
Posts: 97
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Post by acatalepsy on Sept 28, 2016 21:53:25 GMT
If I understand what you mean, it can be perfomed perfectly by making the target your frame of reference. It becomes fixed within that frame and it become merely a game of moving the green and red sliders to get an intercept, no matter how wonky the trajectory looks it will make all sense again when getting back to the central moon/planet/sun as your frame of reference. You don't understand what I mean. Doing that will guarantee an intercept, but not a minimum dV intercept/capture. That can only be done when the target body and starting location are aligned (which will happen on a periodic basis). This game, unlike KSP, does not make it easy to find when this alignment occurs, so it requires some guesswork. |
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Post by boomertiro on Sept 29, 2016 5:02:50 GMT
Yeah getting better at this, but I definitely miss the ability to slide the maneuver back and forth along the orbit to more finely adjust when it happens for maximum efficiency. Also, not controlling the craft directly and having to give orders I hope are followed how I mean also presents quirks not present in KSP. These two issues combined were my main holdup to the Uranian mission, so the mission was poorly timed and highly inefficient, when I know it's possible to do the same thing without spending most of my Delta-V. I know there is a highly efficient way to do it involving braking, lowering my periapsis to the right point for escape burn, burn at periapsis for the entire transfer OR catching another body for a gravity assist and the transfer. And yet getting that to happen in CoaDE is very different from getting that to happen in KSP.
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Post by boomertiro on Oct 1, 2016 5:19:09 GMT
Ok, wow, no... getting from the Belt to Mars is somehow difficult!? With nuclear engines? The mission Homecoming is just being a bag of dicks right now. With a tight time limit waiting for Mars to line up does not seem to be a thing I can do. What am I missing, if anything?
So yeah, I still suck at Hohmann transfers. At least on CoaDE for the time being. Any help would be appreciated.
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Post by quarkster on Oct 1, 2016 5:28:42 GMT
How much delta-v does your fleet have? You want to burn retrograde and radially away from the sun. It's not hard to get a fast intercept with doable delta-v that way. Bring a tanker.
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Post by boomertiro on Oct 1, 2016 6:15:32 GMT
...radially AWAY from the sun? I'll try it, mind explaining the mechanics behind why?
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Post by quarkster on Oct 1, 2016 13:34:23 GMT
The radial burn increases your eccentricity and rotates your argument of perigee forward, which is what you need in this case. You would do a radial inward burn for a retrograde argument rotation.
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