New Release Interplanetary Modular Spacecraft RC9

[wingnut]

The ISP in the IMS config files is given in m/s, isn't it?

Is there a way to recalculate it in s so that I can calculate my required wet mass from the dry mass?

If I use the ISP from the IMS config files I get a mass ratio which is smaller than 1, e. g.:

Required Delta-V: 20,000 m/s
ISP: 8,000 m/s
Empty mass: 149,100 kg

Mass ratio = ln(20,000 / 8,000) = 0.92

Edit:
Alright, I read the wikipedia article on the specific impulse again and noticed that the factor for the unit conversion of the ISP from m/s to s is 9.8066

Consequently my corrected example from above is:
Required Delta-V: 20,000 m/s
ISP: 8,000 m/s / 9.8066 = 815.77 s
Empty mass: 149,100 kg

Mass ratio = ln(20,000 / 815.77) = 3.199

 

[jedidia]

If I use the ISP from the IMS config files I get a mass ratio which is smaller than 1, e. g.:

[ame="http://en.wikipedia.org/wiki/Mass_ratio"]You DO NEED m/s to calculate mass ratio (i.e. the exhaust velocity)![/ame]

Mass ratio being smaller than one isn't tragic, it simply means that the overall mass of propellant is less than your dry mass. With a good ISP and reasonable DV expectations, this isn't a rare occurance.

What map is this?

static map<string, SolarArrayConfig> solarArrayConfigs in PowerSystems.h (of course the same also applies to communication systems, but if I figure out why one of the is suddenly empty at ExitModule(), I'll also know why the other is).

I wonder why D3D9 would handle that particular process so much more efficiently than D3D7 did. All it is is basically overlaying yellow boxes onto the screen...

DX does not come with a built in font engine. I suspect that the inline client draws the labels using WinGDI, as it did to draw the panels before Orbiter 2010.

Jedidia, is there anything that you can reccomend for my issues with D3D9? I would also like to get it running with my IMS vessels.

Do you expierience the same problem with other scenarios too (also in Sol)? if yes, try to find out the minimum configuration in which it doesn't happen (if it even happens only with a CM, I've got somewhat of a problem on my hands).
If no, try to find out what causes it in this specific scenario (well, it's basically the same procedure).
Deactivate absolutely any and all other modules for these tests! Plugins (except for D3D9 client, of course), even other vessel modules, everything!

 

[wingnut]

You DO NEED m/s to calculate mass ratio (i.e. the exhaust velocity)!

This means I have to use the 8,000 m/s from my first example?

And then I multiply dry mass with the mass ratio and the result is the propellant mass I need?

 

[jedidia]

Uhm no. I'm a bit rusty. Give me a sec...

---------- Post added at 11:08 AM ---------- Previous post was at 10:56 AM ----------

Right. Spotted your problem.

I didn't quite realise it at the beginning, because I didn't read your post thouroughly enough. There is an inverse definition of mass ratio where it alsways is smaller than 1, so M1/MR = M0. But this is not the case here.

Your problem is quite simply this:

Mass ratio = ln(20,000 / 8,000) = 0.92

The mass ratio isn't the natural logarithm of DV/Ve. It's the inverse natural logarithm.

---------- Post added at 11:39 AM ---------- Previous post was at 11:08 AM ----------

Right. static on the global level does not mean the same as on the function level. I keep forgetting :facepalm:

 

[wingnut]

I see, so in fact the mass ratio would be

e^(20,000 / 8,000) = 12.18

Thus the required propellant mass would be (149,100 kg * 12.18) - 149,100 kg = 1,759,380 kg

 

[jedidia]

Jup, seems about right... DV's a female dog.

Memory leaks gone. there was no deallocation of the tracking animations whatsoever (they were'nt stored together with the other animations). So that's one less problem. Now let's fix the PMI and make auto-attach only kick in after integration, and see if RC4 has less mysterious, irreproducable crashes than RC3...

 

[Dantassii]

Icebreaker analogy

Now let's fix the PMI and make auto-attach only kick in after integration, and see if RC4 has less mysterious, irreproducable crashes than RC3...

I've found a good analogy to finding software bugs. They love to hide. But resolving them is very much like the way that icebreakers work when they are working on sheet ice. They can usually see their destination, a clear patch of water, some distance away, with a HUGE sheet of ice between where they are and where they want to go. So they back up a good distance (about 2-3 KM) then accelerate up to flank speed and ram into the ice, breaking some of it as they come to a complete stop. Exactly how much they break each time they ram the ice is random, and how much closer they get to their destination is also random. But the only thing to do is back up again.. and run into the ice at full speed. Sometimes they get lucky and the entire ice sheet splits in 2 and they get a clear run to their destination. But most times they have to ram, and ram, and ram, and ... lots of times... and finally they get to where they are going.

Where a software developer wants to go is bug-free code. How many bugs are there to fix? unknown. How many patches will it take to get to where you want to go? unknown. But you may get lucky and all the bugs resolve with 1 single patch and suddenly you find yourself in Nirvana.. bug-free code.

Dantassii
HUMONGOUS IMS shipbuilder

 

[jedidia]

RC 4 is up. Fixes a few things, changes autoattach to only kick in after integrations, and hopefully solves some of the mysterious crashes reported by some.

and suddenly you find yourself in Nirvana.. bug-free code.

Well, uhm... :shifty: I'm a religious guy, I believe in God, Judgement day, the second comming and all that... But I do not believe in bug-free code! :lol:

 

[Dantassii]

Well, uhm... :shifty: I'm a religious guy, I believe in God, Judgement day, the second comming and all that... But I do not believe in bug-free code! :lol:

Well, I'm an eternal optimist, as well as a Murphy Magnet. I believe there is such a thing as bug-free code.

I assume RC4 can be copied directly on top of RC3?

Dantassii
HUMONGOUS IMS shipbuilder

 

[jedidia]

I assume RC4 can be copied directly on top of RC3?

If you want backward compatibility, that's the way to go. If not, you're better served by deleting the old config files. But in your case the point is quite moot, I think.

 

[Dantassii]

If you want backward compatibility, that's the way to go. If not, you're better served by deleting the old config files. But in your case the point is quite moot, I think.

I'm getting a 404 error when I try to download RC4....

Dantassii
HUMONGOUS IMS shipbuilder

 

[BruceJohnJennerLawso]

RC 4 is up. Fixes a few things, changes autoattach to only kick in after integrations, and hopefully solves some of the mysterious crashes reported by some.



Well, uhm... :shifty: I'm a religious guy, I believe in God, Judgement day, the second comming and all that... But I do not believe in bug-free code! :lol:

Thanks for the RC4 upload, will DL here.

And Jedidia, you can believe!!!

#include <iostream>
using namespace std;
int main ()
{
cout << "Hello World!";
return 0;
}

Works flawlessly every time :lol:

 

[Dantassii]

404 when I try to download RC4

Is anyone else getting a 404 error when they try to download the RC4 file? I get to the page, click on the download, choose my download program (just like I've done with all the earlier RCs) and then it gets a 404 error as if the file isn't even there.

Dantassii
HUMONGOUS IMS shipbuilder

 

[BruceJohnJennerLawso]

Is anyone else getting a 404 error when they try to download the RC4 file? I get to the page, click on the download, choose my download program (just like I've done with all the earlier RCs) and then it gets a 404 error as if the file isn't even there.

Dantassii
HUMONGOUS IMS shipbuilder

I dont get any 404 messages, but the download doesn't start for me either. Perhaps an issue on the download site?

 

[Dantassii]

Good, I'm not not seeing things.

I dont get any 404 messages, but the download doesn't start for me either. Perhaps an issue on the download site?

Ok, so I'm not not seeing things then. I don't get the 404 message from the web browser, I use a download add-on so I can control the bandwidth my computer uses to download stuff and it tossed the 404 error.

Dantassii
HUMONGOUS IMS shipbuilder

 

[PeterRoss]

Is Ge.tt not working? I can't download RC4, the download fails when starting, but the counter is incrementing anyway. It shows 84 dowloads now, I can't believe IMS became this popular all of a sudden

---------- Post added at 09:40 ---------- Previous post was at 09:40 ----------

Oh, right, just refreshed the thread page... :uhh:

---------- Post added at 14:00 ---------- Previous post was at 09:40 ----------

Errkhey, fixed the config errors like you said, heres the file if anyone wants it:

View attachment 12153

Invalid Attachment specified, says Orbiter-Forum.

 

[BruceJohnJennerLawso]

Invalid Attachment specified, says Orbiter-Forum.

Yeah, I know something screwed up there. Here are the contents of the file, as sent to Donatello:

Name Upsilon Andromedae
alias 50Ups And
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;-------------------------------------

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;-------------------------------------

planetnumber 3 2
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;-------------------------------------
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;-------------------------------------

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;-------------------------------------

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;-------------------------------------
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;-------------------------------------

planetnumber 4 3
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;-------------------------------------

planetnumber 5 1
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;-------------------------------------

planetnumber 5 2
name Ups And f II
type rock
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[jedidia]

Confirming the download issue, no idea what's wrong. The strange thing is that it does show 144 downloads, so the problem doesn't seem constant. However, it doesn't happen for any of my other files, so no idea what's going on there. I did a re-upload and updated the link on the first page, seems to work, at least for me.

 

[PeterRoss]

Just dowloaded it successfully.

 

[wingnut]

I searched the thread but did not find a formula for how IMS calculates the power output of solar panels although the topic has been discussed a couple of times.

How can I calculate the power output of a solar panel at a certain distance from the sun assuming optimal alignment (perpendicular to the sun I suppose)?