With regard to OMS assist, I thought I read some where that the OMS engine could only work in the vaccum(spel) of space, or am I getting RCS thusters and OMS engine mixed up?
Quote from: Jorge on 06/15/2009 04:29 pmQuote from: elmarko on 06/15/2009 03:48 pmI guess what I'm wondering is what gives the greater benefit, loading those OMS tanks with fuel and then burning them, or not filling the amount that would be burned.I assume from your answer that it's the former.That is correct, and that is why OMS assist is done.IIRC, the OMS tanks have to be filled completely (or as close to full as possible) because there is no sensor gage to tell you how much prop is in them. They have to fill OMS tanks completely to know with a high degree of certainty how much prop is in them at launch. Then, you burn what you don't need for the miss during ascent -- OMS assists -- and use calculations once on orbit to approximate how much OMS prop is left in the tanks after each firing of the OMS engines. Am I remember incorrectly?
Quote from: elmarko on 06/15/2009 03:48 pmI guess what I'm wondering is what gives the greater benefit, loading those OMS tanks with fuel and then burning them, or not filling the amount that would be burned.I assume from your answer that it's the former.That is correct, and that is why OMS assist is done.
I guess what I'm wondering is what gives the greater benefit, loading those OMS tanks with fuel and then burning them, or not filling the amount that would be burned.I assume from your answer that it's the former.
Quote from: Antares on 06/14/2009 03:47 amThey're all helium, no? The Air Liquide GN2 line is kept at 6-7 ksi. No real need for a plenum.It's been a while since I was out there, but my foggy memory is that the tanks contain, not just helium, but also nitrogen and breathing air (for SCAPE operations and possibly crew cabin supply). But I could be wrong (happened once or twice before)......
They're all helium, no? The Air Liquide GN2 line is kept at 6-7 ksi. No real need for a plenum.
Quote from: someone on 06/12/2009 08:52 pmBanjul, also no longer used, is Yundum International Airport. NASA built a dedicated building at each of those locations.STS-125 was told "negative Moron, select Banjul." Wouldn't that imply it's still used?
Banjul, also no longer used, is Yundum International Airport. NASA built a dedicated building at each of those locations.
Can the shuttle launch in rain (not thunderstorms)?
Can the shuttle launch in rain (not thunderstorms)? And does it go through mach 5 before 60,000 ft or above it?
Quote from: usn_skwerl on 06/17/2009 12:31 amCan the shuttle launch in rain (not thunderstorms)? And does it go through mach 5 before 60,000 ft or above it?rain on tiles is like water on sugar cubes
I wasn't sure about rain during launch, due to the weatherproofing on the tiles. Thanks gentlemen.
Hi folks:I am sitting sitting here in Vancouver, Canada watching launch prep for STS-127 -hope she goes- and some questions came to mind.1) How do they chill the lines for tanking (I didn't think you could put anything in the lines prior to tanking as they go to the LH2, LOX tanks)?2) Why does the GUPC vent line come off at ignition and not when the "beanie cap" comes off as I assume both tanks need to be repressurized?3) What is the difference between fast fill and slow fill?4) Why are the LH2 tank and LOX tank filled at different times?