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Old 11-02-2018, 10:23 AM   #16
gattispilot
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So this is what I have so far:
https://drive.google.com/open?id=1ld...27O9YF8OJ4REYI

So keys are:
1 deploy panels
2 lock solar tracking
5 selects how many ion engines.
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Old 11-02-2018, 07:39 PM   #17
Jeremyxxx
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I have found an image of the proposed Mercury Lander that was to be included in the BepiColombo mission but was cut from the mission. I have thought of adding the lander as a bonus.

https://www.esa.int/spaceinimages/Im...lombo_s_lander
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Old 11-02-2018, 08:36 PM   #18
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About the thrust of the MTM, See here the T6 is the engine used:

https://www.qinetiq.com/what-we-do/s...ric-propulsion

The maximum thrust is limited to 290 mN though when using two thrusters, because of power limits.
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Old 11-02-2018, 09:10 PM   #19
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I have RCS set at 10:
Code:
const double MAXRCSTH = 10;
and main thrust:
Code:
	th_main[0] = CreateThruster(_V(0, 0, .3), _V(0, 0, 1), 352 / 4, tank3, ISP);
	th_main[1] = CreateThruster(_V(0, 0, .3), _V(0, 0, 1), 352 / 4, tank3, ISP);
	th_main[2] = CreateThruster(_V(0, 0, .3), _V(0, 0, 1), 352 / 4, tank3, ISP);
	th_main[3] = CreateThruster(_V(0, 0, .3), _V(0, 0, 1), 352 / 4, tank3, ISP);
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Old 11-02-2018, 09:37 PM   #20
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I know SI units are not common in the USA, but its Millinewton: 1/1000th of a Newton.

The maximum thrust of one engine in Orbiter would be 0.23. And that for quite a long time. Specific impulse should be about 43000 Ns/kg.
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Old 11-02-2018, 09:58 PM   #21
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Code:
const double FUELMASS = 1400;
SetEmptyMass(1100);
So what would be the max thrust if all 4 ion thrusters were fired?
So isp is in m/s right?
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Old 11-02-2018, 10:01 PM   #22
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Quote:
Originally Posted by gattispilot View Post
 
Code:
const double FUELMASS = 1400;
SetEmptyMass(1100);
So what would be the max thrust if all 4 ion thrusters were fired?
So isp is in m/s right?

Yes. And you can't fire all four at once. Simply, because there is not enough electricity in the spacecraft.


Two engines at once is the limit and that then with reduced maximum thrust for both.
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Old 11-02-2018, 10:07 PM   #23
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So the max thrust should be .23/2
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Old 11-02-2018, 10:27 PM   #24
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Quote:
Originally Posted by gattispilot View Post
 So the max thrust should be .23/2

Well, if you are using two engines, it should be 0.29/2 = 0.145


0.23 is the maximum thrust of one engine.


0.2 is the thrust with the optimal specific impulse.
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Old 11-02-2018, 10:51 PM   #25
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Ok. So i will make it so only 2 fire and isp of .2
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Old 11-02-2018, 11:51 PM   #26
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Quote:
Originally Posted by gattispilot View Post
 Ok. So i will make it so only 2 fire and isp of .2

No - ISP is 43000 m/s at 200 mN thrust for one engine. But as said: If the MTM uses two engines, the electrical power is only enough for 290 mN thrust in total for both engines: 145 mN for one engine.

---------- Post added at 00:51 ---------- Previous post was at 00:11 ----------

In this PDF, you can find a performance plot of a T6 thruster, on page 6:

http://epic-src.eu/wp-content/upload...adrid-2017.pdf
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Old 11-03-2018, 12:22 AM   #27
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So have only 2 engines fires.
Code:
th_main[0] = CreateThruster(_V(0, 0, .3), _V(0, 0, 1), .29 / 2, tank3, ISP);
	th_main[1] = CreateThruster(_V(0, 0, .3), _V(0, 0, 1), .29 / 2, tank3, ISP);

const double ISP = 43000;
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Old 11-03-2018, 07:54 AM   #28
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Yes - and that is switched during the mission to reduce tear and wear. Those new engines are much better than previous generations, but still they allow less on-off-cycles than a classic RCS thruster for example.
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Old 11-04-2018, 12:45 PM   #29
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So here is the MPO


It has reaction wheels and rcs and thrust. I need to see what those amount are.
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Old 11-05-2018, 03:32 PM   #30
Jeremyxxx
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The Mercury Planetary orbiter is coming together!
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