Mojave

Will Work For Gas
Moderator
Is she an astronaut?

I haven't decided yet. I haven't quite completed her story arc yet.

Urwumpe

Not funny anymore
Donator
Managed to get hands on an older Spacepilot controller...

Loru

Retired Staff Member
Retired Staff
Donator
Oh goodie, parents is going out for vacation in Poland and I get to come with them :woohoo:

If you'll be staying in Warsaw or near drop me a PM.

jedidia

shoemaker without legs
Managed to get hands on an older Spacepilot controller...

You mean, like, those 3d mouse thingies? Somehow I never quite understood what they do exactly...

Urwumpe

Not funny anymore
Donator
You mean, like, those 3d mouse thingies? Somehow I never quite understood what they do exactly...

I used a first generation one (still with a DLR logo on it) for controlling a robot arm at the university... which was very easy after a few minutes of getting used to it.

Primary use for those controllers is CAD though, like quickly rotating or translating views or objects.

But you can also use it for Orbiter as a very intuitive controller for steering spacecraft in orbit.

ISProgram

SketchUp Orbinaut
Okay, was working on some detailed .msh for the addon I'm making, but ran into an issue. I didn't know how big a feedline would be. I thought up a way to calculate, but I want to know if it has any faults.

Okay, first stage uses RP-1 (.806 g/ml)/LOX (1.141 g/cc).
First stage engine has a Isp of 338 (vacuum) and 309 (sea level) and produces a force of 12400 kN at sea level. So:

Mass flow - 12,400,000/9.81/309 = 4090 kg/s. The engine has a O/F ratio of 1:2.6, so oxidizer flow is 1136 kg/s and fuel flow is 2953 kg/s.

With the given densities of the propellant, this amounts to 3,663,771 cm3/s for RP-1 and 995,617 cm3/s for LOX, using this calculator.

So using this calculator, the RP-1 feedline is 0.69 meters in diameter and the LOX feedline is 0.36 m in diameter.

Any thoughts?

sorindafabico

New member
After five years Orbiter still amazes me. After reading a bit about non-spherical perturbations I made a test and the simulation gave me values close to those calculated.

And after five years I put a ship in a Molniya orbit for the first time =P

Urwumpe

Not funny anymore
Donator
So using this calculator, the RP-1 feedline is 0.69 meters in diameter and the LOX feedline is 0.36 m in diameter.

The calculator feels a bit strange to me, usually you would expect some words like "total pressure" or "viscosity" there to get the necessary diameter including factors like pressure drop.

Especially the LOX feed line appears a bit optimistic in comparison. I need to look for the data at home, but I believe you have about the same mass flow as two SSMEs there, but a much smaller pipe diameter than a single one (but don't nail me on that, I can't remember the exact number, it could also be around 800 kg/s for one SSME, instead of 600 kg/s)

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Donator

orbitingpluto

Orbiteer

What's that in the sky?

It's a Saturn Typo!:lol:

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ISProgram

SketchUp Orbinaut

You can do this in GTA?!

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Anroalh12

Do you know how to create a celbody module?

Urwumpe

Not funny anymore
Donator
Do you know how to create a celbody module?

Sure. for what purpose?

Anroalh12

I'm creating a planet, so I want something that controlls it (a module).

Urwumpe

Not funny anymore
Donator
I'm creating a planet, so I want something that controlls it (a module).

Yes. But what do you want to control with it?

Anroalh12

I want something like the Earth.dll file located in /modules/Celbody but for another planet (my planet).

Sorry for my english, I'm spanish.

Urwumpe

Not funny anymore
Donator
I want something like the Earth.dll file located in /modules/Celbody but for another planet (my planet).

yes, but you have two options there:
Defining an ephemeris module for more accurate planetary orbits than plain Kepler orbits
Defining an atmosphere model

If you need neither, you can just use a configuration file for the start.

Sorry for my english, I'm spanish.

Sorry for my English, I'm German.:tiphat:

Anroalh12

It would be an ephemeris module.