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Author Topic: Kerbal Space Program: Now Hiring Optimistic Astronauts for Dangerous Munission  (Read 1491251 times)

Putnam

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I take it you never use ion engines?
Not successfully!

NERVAs can result in them too.
Please don't acronym. If you do, the abbr key is nice.

Nuclear

GreatWyrmGold

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I figured that out by checking the Wikipedia article. (If I hadn't I would have said so.)
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BigD145

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I try not to make heavy nuclear pushers and if I do it's orange tanks with 6+ nuclear each. Long burns suck so much.
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GreatWyrmGold

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On that note...I decided to try making an interstellar ion craft.

First, the landing iony part.


By the way, I fully support the development of a radially-mounted ion engine.

Next, a rocket to get it into orbit.



And finally, a cute little booster to hopefully help that stage out.



(Because the big white ones are a bit overused.)

The Ion Interplanetary I, or III, is being piloted by one Donlan Kerman. Looking at it on the launch pad...it's smaller than many of my rockets, but I've been told I overengineer, so that's not a bad thing.
It launches well.



Not ten seconds in, the boosters start to overheat, the bars climbing at almost the same rate as the solid-fuel gauges rise. The rocket tilts a bit west (why do they always do that?)
A bit under six thousand meters and thirty seconds, I eject that first stage and go onto the liquid fuel rocket. I promptly correct my courst with a combination of reaction wheel and thrust vectoring, then begin a nice little gravity turn.

Rocket fuel runs out all of a sudden at a bit under 40 kilometers, with the apoapsis a bit under 50. Well, only one solution, really.



Man, those things might not have much thrust, but they sure look cool.

Sadly, drag is slowing me down and lowering my apoapsis faster than my little engine that evidently can't (in a gravity well) can do the opposite. Oh well...



Those look pretty cool.



Aw.



A picture before splashdown, showing all slow-down systems being nominal.



A picture after splashdown, showing all systems...um...un-nominal.


Huh.

Well, I don't have time to design the IIII right now, but when I do, some notes.

1. Bigger rocket booster.
2. Radial-decoupling solid boosters. (More/Bigger?)
3. Parachutes. More parachutes.
4. Also more ion engines.
5. We're gonna need a bigger lander-can (to put all this crap on).
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GreatWyrmGold

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Ion engines aren't used for landing. Ever. They are only used for probes, really. They produce so little thrust that they'd only be able to land on minmus if they were propelling nothing but themselves.

Stick to nukular/landing engines for landing.
The ion engine wasn't intended to slow the landing. The parachute was.
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MaximumZero

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What were you going to use to land on whatever you were going to land on aside from Kerbin? Can't use parachutes on moons. No atmosphere to slow you down.
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Holy crap, why did I not start watching One Punch Man earlier? This is the best thing.
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10ebbor10

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Yeah, besides, on any planet with atmosphere the ion engine is going to speed you up, rather than slow you down. (Extra gravitational acceleration due to additional mass)
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LoSboccacc

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Yeah, besides, on any planet with atmosphere the ion engine is going to speed you up, rather than slow you down. (Extra gravitational acceleration due to additional mass)
Galileo would be ashamed.
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IronTomato

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The big rocket is starting to get better. It doesn't fall apart anymore, but the first atomic engine stage doesn't have enough raw power to retain altitude for long enough to achieve orbit...

At least it flies very nicely before then.
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PTTG??

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Yeah, besides, on any planet with atmosphere the ion engine is going to speed you up, rather than slow you down. (Extra gravitational acceleration due to additional mass)
Galileo would be ashamed.

No, no. Air resistance changes things. In a vacuum then density doesn't really matter.
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Descan

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Yeah. Pretty sure Eve and Duna are big enough that any change in the space-crafts mass is over-ridden by the HUGE HONKING PIECE OF ROCK PULLING IT TO IT'S DOOM.

...
*ahem* Carry on.
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GreatWyrmGold

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What were you going to use to land on whatever you were going to land on aside from Kerbin? Can't use parachutes on moons. No atmosphere to slow you down.
Parachute. (I was going to go for Eve.)

Yeah, besides, on any planet with atmosphere the ion engine is going to speed you up, rather than slow you down. (Extra gravitational acceleration due to additional mass)
Galileo would be ashamed.
Extra mass means extra force. The ion engine does not get stronger with higher gravity. Hence, the (net) acceleration is higher.
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GreatWyrmGold

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That wasn't part of the plan, no. But better Eve than a little spacecraft stranded in the middle of nowhere!
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10ebbor10

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Yeah, besides, on any planet with atmosphere the ion engine is going to speed you up, rather than slow you down. (Extra gravitational acceleration due to additional mass)
Galileo would be ashamed.

No, no. Air resistance changes things. In a vacuum then density doesn't really matter.
Yup, I was going for air resistance. Ion engines have rather high density, and low drag.
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LoSboccacc

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Except you wrote extra gravitational eccelleration.

I know drag, but what's more is the gravitational force, accelleration being constant.
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