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Author Topic: DG-III Flight Test Data (post bugfix)  (Read 16816 times)

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Offline Atom

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Reply #50 - 07 May 2004, 00:08:09
Brrrrrrrrggggghhhhhh, wooweee. That smells bad. Hehe.



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Offline DanSteph

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Reply #51 - 07 May 2004, 02:34:40
Quote
Atom wrote:
I just kamikazed (farted). Hehe. Get it, divine wind. Hehe.


Why do you think Mr "Pilot-Near-incorporation" we all have a spacesuit here... ?

Gentlemen, time to close our helmet, put O2 at max :)

Dan
"maydayy maydayyyyyy forum's going down in dirt , pull up pull up"



Post Edited ( 05-07-04 02:36 )


Offline freespace2dotcom

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Reply #52 - 07 May 2004, 06:06:27
hehe.. good one dan.. I'm currently trying to get to jupiter, kind of an accomplishment if I make it... But I figure it'll be
really interesting how the dg3 reacts to the extreme gravity and how different it'll be trying to "land" there. Granted
you couldn't do it in real life, but the extremes at jupiter should prove interesting. (I'd have just edited a config to get
there, but I want to prove that I can get to another planet besides mars.) ;)



Post Edited ( 05-07-04 06:15 )


Offline freespace2dotcom

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Reply #53 - 07 May 2004, 23:03:26
All right, news update: I made it to jupiter! that means that I'm that much better than those other people that can't!
Anyway, I tested a variation of the "Straight Down" technique, it was quite memorable, I made a snapshot as the
temperatures of my ship caused nuclear fusion to begin on jupiter*, it was funny... Anyway, I'll take back everything
I've said about the g's not killing you before reaching the atmosphere, but I can't let this one pass..  since jupiter is
actually so big, the G's were quite interesting, I noted that because of the acceleration due to gravity, the monitor
was reading about 2 g's during my fall. I noted this to a lesser extent on earth, I mentioned it earlier.
Quote
freespace2dotcom wrote:
At 80Km my vertical speed was 2272m/s and airspeed was at 2296. At this time I was experiencing 0.959 Gs, which
got me curious because technically I was still in a freefall

Now, I happen to know that you wouldn't feel those g's at all, here's a quote from nasa.  

http://www2.jpl.nasa.gov/basics/bsf4-1.html

Quote
"An interesting fact to consider is that even though a spacecraft may double its speed as the result of a gravity assist, it feels no acceleration at all. If you were aboard Voyager 2 when it more than doubled its speed with gravity assists in the outer solar system, you would feel only a continuous sense of falling. No acceleration. This is due to the balanced tradeoff of angular momentum brokered by the planet's -- and the spacecraft's -- gravitation."


I have the config file I saved from my journey, anybody can have it if they wish. You have to do a bit of time
compression, though. Also, A little comment about the death message you get when you burn up.

It says:
Quote
"due to high temperature, your vessel was desintegrated in atmosphere... you are dead !!!"

It would be better if it said:
Quote
"Due to high temperature, your vessel was disintegrated in the atmosphere.. You are dead!!!"

*It really didn't start fusion, but it would have in real life, I'm sure of it.



Post Edited ( 05-07-04 23:12 )


Offline Atom

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Reply #54 - 08 May 2004, 00:29:32
Quote
DanSteph wrote:
Quote
Atom wrote:
I just kamikazed (farted). Hehe. Get it, divine wind. Hehe.

Why do you think Mr "Pilot-Near-incorporation" we all have a spacesuit here... ?

Gentlemen, time to close our helmet, put O2 at max :)

Dan
"maydayy maydayyyyyy forum's going down in dirt , pull up pull up"

It's Mr 'Pilot' actually.



Intel Pentium 4 630 3Ghz|1024mb 400mhz DDR RAM|ASUS P5P800-VM|Nvidia GeForce 6200 256mb|Creative Sound Blaster Pro Value!|Windows XP SP2

Offline freespace2dotcom

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Reply #55 - 08 May 2004, 00:31:58
Come now, I'm trying to be serious here.. You're disrupting the mood....



Offline Atom

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Reply #56 - 08 May 2004, 00:35:00
Sorry, but it's true.



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Offline freespace2dotcom

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Reply #57 - 08 May 2004, 03:05:30
What are we going to do with you...

*sigh*



Offline DanSteph

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Reply #58 - 08 May 2004, 03:22:57
Quote
freespace2dotcom wrote:
At 80Km my vertical speed was 2272m/s and airspeed was at 2296. At this time I was experiencing 0.959 Gs, which
got me curious because technically I was still in a freefall

While Martin don't provide us with any help on this subject
G calculus are based on the delta position of your ship
say each second you move 10m if you move suddenly 15 m -> acceleration
this work somewhat but the odd things is that planet G effect aren't at all
calculated. I don't know any way to calculate this in an easy way...
You can see also that the surface MFD have the same problem.

Anyway as your freefall speed *change* there is an acceleration somewhere.

Dan


Offline freespace2dotcom

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Reply #59 - 08 May 2004, 03:27:38
I won't argue about whether there is a change or not, I'm just reading the nasa's basics, and they say that you
wouldn't *feel* the acceleration because of "the balanced tradeoff of angular momentum brokered by the planet's --
and the spacecraft's -- gravitation."



Offline DanSteph

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Reply #60 - 08 May 2004, 03:32:06
Quote
freespace2dotcom wrote:
brokered by the planet's -- and the spacecraft's -- gravitation."

Yes planet, that's the key, the acceleration of the planet isn't at all taken in account
because I didn't find anyway to calculate this, I tried but I failed to this.

You must deal with vectors and many odd things, I even asked people very confident
in mathematic but no one did find the solution.
The planet G math seem simple but when you come to apply them on
computer simulation and especially this case it's another problem.

Ther must be a solution, that's sure but I don't have it yet :sad:

It would be cool to show 35G or whatewer landed on Jupiter.

Dan


Offline freespace2dotcom

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Reply #61 - 08 May 2004, 03:46:51
Well, fascinating, I'll keep an eye out for that now, but I doubt I'll have any luck...



Offline DanSteph

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Reply #62 - 08 May 2004, 03:51:56
Notice that not only it should work but also it should work *FAST*
a calculus that would lower the framerate more than 1-2 fps
is an absolute no-no.

It aint simple uh ? :)

Dan


Offline freespace2dotcom

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Reply #63 - 08 May 2004, 03:57:00
I see, but that'd be hard for *me* to tell. My cpu could run two instance of orbiter and probably wouldn't show it.



Offline freespace2dotcom

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Reply #64 - 20 May 2004, 14:14:21
Say dan, I was thinking about this, and wouldn't it be possible to just *ignore* g's caused by telling the code to only
register g's when, say, the engines are on, or when you're re-entering? I know there probably isn't anything that
would distinguish acceleration via gravity and those two methods, but I think that it's a start. what do you think?


« Last Edit: 20 May 2004, 14:14:21 by freespace2dotcom »