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Messages - ApolloGirl

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General Discussion / barbecue roll
« on: December 17, 2017, 07:00:23 PM »
The Passive Thermal Control maneuver, aka the barbecue roll, is a maneuver used by the Apollo spacecraft on its coast to the Moon. The CSM rotates along its x-axis (along the length of the body) of about one revolution per 10 minutes or slower. The in order to disperse heat from the Sun and heat up the spacecraft evenly.  

Active torquing was required to maintain the desired attitude because the moment of inertia principal axes were not precisely aligned with the spacecraft axes. This was accomplished by using the rotational hand controller to create a pure torque about the roll axis, instead of using the active attitude control mode.

This maneuver was first successfully tested in Apollo 7.
In Apollo 13, the crew performed a barbecue roll before powering down the spacecraft to avoid further thermal damage to the ship. 

General Discussion / Saturn V fuel vapor
« on: December 14, 2017, 08:10:08 AM »
Ever wondered was that steam coming out of the side of the Saturn V rocket is? If you look closely, you'll see vapor steaming out of the top of the fuel tanks hours prior to launch.

All the three stages of the Saturn V use liquid oxygen (LOX) as oxidizer. The LOX is kept liquid at about -183 degrees Celsius. To main this temperature it continuously boils off and is replenished through the fill and drain line between loading and prepressurization.

General Discussion / Early Access roadmap ahead
« on: December 11, 2017, 09:48:29 AM »
As many of you already know Space Simulator is coming soon to Steam Early Access. We plan to roll out the game in various stages through Early Access. 

Initial launch will include a detailed Apollo 8 mission. This includes launch, translunar injection, lunar orbits and return to Earth.

In the following months we plan to finish work on the Lunar Module to release Apollo 9, which was the first mission with the LM, then Apollo 10 and 11, etc. in successive months. 

Once all the Apollo missions are in place we'll start implementing the Steam Space Shuttle missions. This will likely be 6-12 months down the track from now.

Of course, if time permits we will enable VR to make this a truly immersive experience.

General Discussion / apollo 8 earthrise
« on: December 11, 2017, 09:32:26 AM »
Many of us know that famous earthrise image showing a profound contrast between the gray of the Moon and blue of the Earth and the dark of space.

Although entrenched in the popular imagination, this image was in fact not the first photograph ever to be taken of the Earth by a human. 

The first ever picture taken of the Earth rising from the Moon was taken a minute before the above iconic image, but in black and white.

As Apollo 8 circled the Moon for the fourth time, LM pilot Bill Anders spots the Earth coming over the Moon's western horizon through window 5. Interestingly, the crew saw the horizon of the Moon running down vertically. The gap between the Earth and the horizon is much smaller than in the later pictures. 

Facing us is the Atlantic Ocean with the terminator running between South America and Western Africa.

Soon realizing the opportunity at hand, Anders quickly geared up a color roll to take that famous image through the rendezvous window.

General Discussion / Re: Skylab,mobile question
« on: December 03, 2017, 05:58:32 AM »
Skylab is scheduled for next mobile update. Steam Early Access is to feature detailed Apollo 8 mission - launch, TLI, lunar orbit and return.

General Discussion / IMU, REFSMMAT and P52
« on: November 29, 2017, 06:49:53 PM »
A very brief intro of these essential concepts of the Apollo Guidance and Navigation system.
The attitude (orientation) of the Apollo spacecraft was measured by the inertial measurement unit (IMU). The IMU was a set of three nested gimbals that supported a platform at the center. The three gimbals separated the platform from the spacecraft so that the orientation of the platform remained the same while the spacecraft moved around it. The spacecraft's attitude could be calculated relative to the platform's orientation.

The IMU measurements only make sense if we know which way the platform was oriented in space. Here is where the REFSMMAT comes in. A REFSMMAT (reference to a stable member matrix) is a way to express orientationis. It is a set of numbers that describe the orientation of the IMU platform. Since the spacecraft moves substantially with respect to the Earth and Moon, an inertial reference is used. The REFSMMAT is defined with respect to the stars. 

The IMU drifted out of alignment with the REFSMMAT over time. Periodically, and prior to burns, the platform had to be realigned. This realignment is called a P52. A P52 is performed by sighting two stars with a sextant. The computer compares the star's actual position with where it thinks it should be to calculate the amount the platform has drifted.

General Discussion / the burn PAD
« on: November 29, 2017, 02:06:27 PM »
How burns were actually performed in the Apollo missions?

In preparation for each burn, mission control would calculate the currently trajectory, and the magnitude and direction of the upcoming burn. Mission control then writes down the details of the required burn on a standard grid form called a pre-advisory data (PAD). 

Capcom then reads the values on the PAD to the crew, which then writes down its own copy. The crew then reads it back to mission control to check the values have been copied correctly. Ultimately, the crew punches the numbers on the PAD into the DSKY, which then performs the required burn.

The PAD includes information on when the burn should occur, the amount by which it should change the spacecraft's velocity, and the direction in which the spacecraft should be pointing at the time of the burn.

So far we have sufficed with a throttle lever for firing up the engine. For the Steam version we are stepping up the game to include also simulation of burns performed with PAD numbers. 

General Discussion / steam early access beta testers
« on: November 29, 2017, 01:36:06 PM »
Hi all,

As we approach the early access release date, we'd like to see if anyone's interested in beta testing in the coming weeks. Ideally we'd like to have an existing tester who is already a beta tester for the mobile version., just to keep things simple for now.

Anyone interested PM me for steam key.


Development news / Re: Intersecting the ecliptic plane
« on: November 19, 2017, 07:38:41 AM »
Try turning the ORBITAL INCLINATION off in the config (Config/Realism/ORBITAL INCLINATION).

That'll make all the orbits align on the same plane, as is the case in the video. Center your pov so all the orbits align and all stack together. This way you'll see the two points where your orbit intersects the other orbits. You change normal at those points.

Development news / Re: Problem Following Orbit Planner Tutorial
« on: November 14, 2017, 12:05:28 PM »
Hi artemisalien,

In short, the "Select" button from previous versions has been replaced by the "GO!" button. The "GO" button applies changes made to delta-V, delta-T, Normal and Radial. 

The "COMPUTE" button at the bottom calculates the actual orbit path indicated by the pink path. This is a numerically calculated path that takes into account 3rd body gravity influences. This is the more realistic and accurate representation of the path followed by your spacecraft.

Hope that helps!

General Discussion / Re: 1.0.8 for Android release date
« on: November 13, 2017, 10:07:34 AM »
Space Simulator 1.0.8 for Android is finally live on Google Play
Thank you for your patience!

General Discussion / Re: Going to need TestFlight app on new iPad Pro 10.5
« on: November 05, 2017, 03:05:29 AM »
Awesome! Sure you can preserve your apps. Just download the Testflight app again on your new Pro and sign in with your current iTunes account. You should be able to access the game from both devices.

Development news / Re: 1.0.9 (Mobile)
« on: October 19, 2017, 01:47:58 PM »
HI MichaelEggert, it'd be helpful to see the debug screen. To post just attach with the Insert Image button. It's picture frame with a green plus sign at the bottom right corner.

Development news / Re: 1.0.9 (Mobile)
« on: October 07, 2017, 12:57:12 PM »
@Kmassie92 will keep you updated on next iOS beta when it's ready.

@MichaelEggert Space Simulator will still work on iPad 2. The iPad 2 is still one of our main targeted devices. The only one we're considering future support for is the iPhone 4.

@Marz13 Welcome back to the forum!

General Discussion / Re: 1.0.8 for Android release date
« on: September 09, 2017, 07:41:19 AM »
Of course. I'll let you know when we have something ready.

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