Vessel BepiColombo

[gattispilot]

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?

 

[Urwumpe]

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.

 

[gattispilot]

So the max thrust should be .23/2

 

[Urwumpe]

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.

 

[gattispilot]

Ok. So i will make it so only 2 fire and isp of .2

 

[Urwumpe]

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/uploads/23_EPICWorkshop2017_QinetiQ_EPIC_Madrid-2017.pdf

 

[gattispilot]

So have only 2 engines fires.

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;

 

[Urwumpe]

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.

 

[gattispilot]

So here is the MPO

It has reaction wheels and rcs and thrust. I need to see what those amount are.

 

[Jeremyxxx]

The Mercury Planetary orbiter is coming together!

 

[Jeremyxxx]

The Mercury Magnetospheric Orbiter is next.

 

[gattispilot]

I need to fix the width of the panels.

I have the 2 main vessels docked and the shield attached.

 

[Jeremyxxx]

looking good!

 

[gattispilot]

Thanks. Working on the MMO. I am redoing the body. But I have seen 2 versions. One with solar panels the entire length of the body and one not the length. Any ideas?

 

[Jeremyxxx]

I would love to see the cancelled Mercury Lander as a bonus scene.

 

[gattispilot]

What did it look like?

So this is what I have for the MMO.

I suppose the thing in the center should be sun tracking?


So do we have the launch vessel?

 

[Jeremyxxx]

as for the Mercury Lander, it looks like this:

https://www.esa.int/spaceinimages/Images/2001/11/BepiColombo_s_lander

 

[gattispilot]

So this is what I have for the MMO:

I looked at the fact sheet and it mentioned in the shield the launch part for the mmo.

So I will make a rotating attachment point. But at what rotational speed? And then I guess it would release and spin away?

 

[Urwumpe]

I suppose the thing in the center should be sun tracking?

Earth-tracking. Its a communication antenna.



Also, it will spin at 15 RPM.



http://sci.esa.int/bepicolombo/49481-spacecraft/

 

[gattispilot]

Thanks.

So I suppose an attachment ment point that rotates and the MMO is attached. This point rotates to 15 rpm. And then press a key and release? I guess with some z force to move it away from the shield?

Not sure how the code of that earth tracking would be. Maybe similar to sun tracking?