Idea Lunar Prospector, Athena II and Cape Canaveral SLC-46

[Jeremyxxx]

January 7th had marked the 21st anniversary of the launch of NASA's Lunar Prospector spacecraft. as we may need an addon for the spacecraft alongside the Athena II (in Multistage2015) with SLC-46.

---------- Post added at 11:34 PM ---------- Previous post was at 02:53 AM ----------

The Lunar Prospector will be one of the new addons for Orbiter 2016.

 

[Jeremyxxx]

IDK who would do an addon for the Lunar Prospector this time?

 

[PhantomCruiser]

I've got an Anthena 1 and 2 that I'd been working on for multistage. Have to find them though. That computer crashed and I lost a lot of work.

 

[gattispilot]

Well there is good info for mesh making.
http://www.tsgc.utexas.edu/spacecraft/lunar_prospector/diagram.html
https://en.wikipedia.org/wiki/Lunar_Prospector

---------- Post added at 11:13 AM ---------- Previous post was at 05:48 AM ----------

rough model

It looks like that white antenna might retract? So not sure if we have the other stuff. But I should get the animations to work and spin.

 

[Jeremyxxx]

Nice look at the model for the Lunar Prospector!

 

[gattispilot]

So textured it. The thruster seem small but This will be the final model.:

 

[Jeremyxxx]

Nice work on the finished model of the Lunar Prospector!

 

[gattispilot]

Thanks

So I have this. stored:

and then deployed.

So it looks like there were so old Athena2 so maybe I will make one.

Found this paper model of it.:
http://jleslie48.com/jjb01/lunarprospector/

 

[gattispilot]

So I got the Athena2 meshes from here:
[ame="https://www.orbithangar.com/searchid.php?ID=844"]Athena-2ELVbeta05[/ame]

I got stage 1 and 2 in MS2015. and maybe 3rd stage as I don't know how it fits?

But need specs on the mass of the different stages.

 

[PhantomCruiser]

If that's the one I'm thinking of, the Orbit Adjust Module (OAM) is all jacked up. I can't remember what all was wrong with it other than it was messed up.

http://www.spacelaunchreport.com/athena.html
http://www.b14643.de/Spacerockets_2/United_States_2/Athena/Versions/Athena.htm

 

[gattispilot]

Thanks. It looks it has just a third stage and then fairing

---------- Post added 03-06-19 at 07:23 AM ---------- Previous post was 03-05-19 at 09:23 PM ----------

Thanks. I didn't see until today that you had built some Athenas.

So I built the 1st and 22nd stage. with interstages. The one on the Hangar the interstage were built with the stages.
So he has a 3rd stage but no OAM.

good images:
http://www.b14643.de/Spacerockets_2/United_States_2/Athena/Gallery/Athena-II.htm

So it looks like we need a OAM and kickstart.

I think getting meshes wouldn't be too hard. But not sure as far as modules. I suppose kickstart to be 4stage in ms2015.

---------- Post added at 09:19 PM ---------- Previous post was at 07:23 AM ----------

So now a bit confused.
The specs say the OAM is 1.0 height and 2.3 dia. the castor is 2.34dia and 3.5 meter high.

So i wonder if the 1 meter height on the OAM is to the top of the cone for kickstart. I think the top of the 3rd stage might be wrong also?

 

[PhantomCruiser]

I'd initially built the 1st stage with a separate interstage, but too many pictures and refs I'd found had them as one piece, so I built them together as well. The 2nd stage (or 3rd for an Athena 2) using the Orbus 21D I'd made looked pretty much like this https://goo.gl/images/g7P5n9 with a small shoulder in order to accommodate the slightly smaller OAM.

The OAM, that's a goofy little guy. The payload adapter is much taller than the stage I've got a hardcopy of the patent application. It uses 4 small nozzles sticking out the side to provide thrust and steering.

https://historicspacecraft.com/rockets.html

I may see if I can do some forensics on my old hard drive. I had some pretty good reference pictures, and all those meshes. I had their COTS demo built also. Basically an Athena-1 sitting atop a 2.5 segment version of the shuttle SRB. I can't remember how big the fairing was, 3, 4 meters or something.... :shrug:

Here's a good picture, wish I had it to work from years ago.
https://goo.gl/images/gUgwWR

 

[gattispilot]

Thanks. I think I got it.

it looks like the 3rd stage is the oam and castor30.

I try that free patent site but couldn't find the oam.

 

[PhantomCruiser]

Looks good!

 

[gattispilot]

Thanks. I suppose for the purpose of MS2015 the 3rd stage (Castor 30) and OAM should be 1 mesh as far as ms2015, right?
Then the kickstart would be the 4thstage and LP payload
Not sure how the guidance should be set up on this? Like what orbit?

Here is that patent:
http://www.freepatentsonline.com/5816539.pdf

lots of info. I think it will be just a static mess. Animation the thrusters would be a pain.
I thought the slc 46 was on there also but not found it

 

[Urwumpe]

Why animating the thrusters?

 

[gattispilot]

Well I was wrong. I saw there were 4 thruster and I was wrong in think ing that. It has 10. So no need.

I guess for MS2015 I will let it be static. I am assume that the payload adapter must not cover the thrusters on top.So maybe thinking to much.

But it states 6 thrusters for pitch, roll and yaw #108. These are aimed at the outside.
Then 4 of the thrusters are for thrust along the longitudinal axes of the system #109

Nozzles can include downwardly directed axial thrustor nozzles for velocity addition to the launch vehicle.

It looks like they are outside.

I found this handbook with lots of info:
http://pds-geosciences.wustl.edu/missions/lunarp/schandbk.pdf


So I suppose the downward ones are on the outside? though it looks like they would be inside. But then it would fire into the 3rd stage?

 

[4throck]

From your document:
The thrusters are mounted in three pairs.

Pairs A1/A2 forward and A3/A4 aft fire nearly parallel to the spin axis of the spacecraft.
These thrusters are canted 10° from the spin axis of the spacecraft.

Pair T1/T2 fires nearly tangential to the circumference of the spacecraft and are located on its opposite sides.
T1 and T2 are fired for spin-down and spin-up, respectively. T1 and T2 are canted 5° from the tangent to minimize the impingement of the engine exhaust on the spacecraft, but they fire approximately in the same direction

Check page 27 and the diagram on page 28, its all there

 

[gattispilot]

The four axial thrusters are used for major translational burns and reorientation maneuvers.

The two tangential thrusters are used for spin up/down maneuvers.

So as far as guidance goes.
"6.1.3 TLI STAGE STATE VECTORS AT LP SPACECRAFT SEPARATIONThe Athena II launch vehicle was to place the Lunar Prospector – TLI Stage stack into a low Earthparking orbit. The OAM would then spin-up the stack to 3 rpm, orientation the stack for TLI, andrelease the payload at the precise point in space. "

So in ms2015 just need to get a low parking orbit, right? So the final separation from the 3rd stage leaves the OAm. kick start, LP




But I think need the OAm to spin the kickstart, lp, right?

 

[Jeremyxxx]

Hopefully we didn't forget Cape Canaveral SLC-46?