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Old 08-06-2017, 08:37 PM   #1
ncc1701d
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Default looking for public resource that tells the burn times

Anybody know of a public resource available that tells the burn times for thrusters for different unmanned space missions past or present? example would be the date and time a thruster fires for spacecraft to slow to enter an orbit around a planet.
thank you
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Old 08-06-2017, 08:55 PM   #2
Urwumpe
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The only thing I remember that comes close to this is the NTRS ... but no specific report that has it all in one file. You would need to search for a specific mission or program.
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Old 08-06-2017, 09:41 PM   #3
ncc1701d
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what does NTRS stand for?
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Old 08-06-2017, 09:48 PM   #4
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Quote:
Originally Posted by ncc1701d View Post
 what does NTRS stand for?
NASA Technical Reports Server

https://ntrs.nasa.gov/

The best place to waste time and bandwidth...
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Old 08-06-2017, 10:46 PM   #5
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Thanks for that, didn't know it was available.
Did a search on Skylon, and got this:

https://ntrs.nasa.gov/search.jsp?R=2...atchallpartial

https://ntrs.nasa.gov/archive/nasa/c...0150015818.pdf

Don't understand it, but don't like this bit:

Quote:
A remarkable change in nacelle plume geometry via iso-stagnation enthalpy is observed in Figure 16, when the freestream Mach number is increased from M∞ = 6.673 to 12.189. At M∞ = 12.189 and the altitude of 65.16 km, the nacelle plumes engulf the Skylon aft fuselage. The normalized temperatures at M∞ = 12.189 are significantly higher than those observed at M∞ = 3.508 [Figs. 16(b) and 13]. Figure 17 presents perspective views of the thermal environment around the aft fuselage and in a plane downstream of a Skylon nacelle. At M∞ ≥ 12.189, there are regions where the static temperature is roughly 8-16 times that of the freestream temperature. Where the SABRE plume shock wave hits the fuselage there is a static temperature spike. Subsequently, the static temperature again increases, as hot gases from engines pass over the aft fuselage [Figs. 17(c)-17 (d)]. As seen in Fig. 18, two plume shock waves, one from each SABRE, intersect at the vehicle symmetry plane. In front of the vertical tail, there is a bow shock wave. This shock wave also elevates static temperatures on the fuselage around the base of the vertical tail.
Cart3D

N.

Last edited by Notebook; 08-06-2017 at 11:27 PM.
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Old 08-07-2017, 12:01 AM   #6
boogabooga
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You could try the Eyes on the Solar System program:
https://eyes.nasa.gov/

Supposedly it uses real telemetry data. I checked and it animated the thruster firing for MAVEN. But, you will have to do a little work to get the information out.

Also, Wikipedia might have some dates and times of critical events.

---------- Post added at 08:01 PM ---------- Previous post was at 07:54 PM ----------

Quote:
Originally Posted by Notebook View Post
 Thanks for that, didn't know it was available.
Did a search on Skylon, and got this:

https://ntrs.nasa.gov/search.jsp?R=2...atchallpartial

https://ntrs.nasa.gov/archive/nasa/c...0150015818.pdf

Don't understand it, but don't like this bit:


N.
They (Reaction Engines) didn't think the engine placement out all the way.

Last edited by boogabooga; 08-07-2017 at 12:04 AM.
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Old 08-07-2017, 12:28 AM   #7
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Must admit I always had hopes for Reaction Engines to get the Sabre engine viable, not the Skylon. That always looked too expensive and ambitious. It would never get any support from the UK government.

N.
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Old 08-07-2017, 01:09 AM   #8
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????

What would you do with the engine without its vehicle?
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Old 08-07-2017, 06:51 AM   #9
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Sell it! Licence it for manufacture.

That's a worst case scenario. I'd love to see Skylon work, but the UK has a poor history regarding spaceflight. Already threw away a decent launcher:

http://www.spaceuk.org/bstreak/bstreak.htm

and gave up on satellite manufacture:

https://en.wikipedia.org/wiki/Prospero_%28satellite%29

N.

Last edited by Notebook; 08-07-2017 at 06:55 AM.
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