Quote from: Lee Jay on 04/18/2013 10:32 pmDoes anyone "in the know" (Kim? Antonio?) know if this was a leak-down issue (pump off, oil bleeding by a valve) or a control issue (pump on, servo commanded to zero flow, but actually not quite perfectly zeroed)?No, not a leak-down issue. I don't want to get into specifics (I'll leave that for Orbital to explain, if they choose), but the issue won't recur.
Does anyone "in the know" (Kim? Antonio?) know if this was a leak-down issue (pump off, oil bleeding by a valve) or a control issue (pump on, servo commanded to zero flow, but actually not quite perfectly zeroed)?
"Orbital Sciences' Antares rocket will not launch today. A premature separation of one of the tethers holding the rocket in place on the pad caused the abort." I know Antares has a low Thrust to Weight ratio, but that's ridiculous...
The second one, from the said journalist's web site:"Orbital Sciences' Antares rocket will not launch today. A premature separation of one of the tethers holding the rocket in place on the pad caused the abort." I know Antares has a low Thrust to Weight ratio, but that's ridiculous...
... the guys in our office were praiseful of Orbital's handling of Wednesday's events ...
what does it mean to simulate mass? (vs, you kind of either have it or you don't).
....attempts to simulate the mass properties - again, not just total mass, but moments of inertia.
Not to be any smart alec, but I was just wondering, looking at the nice photos in the article, what does it mean to simulate mass? (vs, you kind of either have it or you don't). "Payload simulator" or "Cygnus simulator" I could relate to. Just wondering if there was any technical history or meaning behind the term "mass simulator", which I presume is not to be interpreted literally. Thanks.
This is help the spacecraft to maintain its mass properties.
Quote from: Jim on 04/19/2013 07:12 amThis is help the spacecraft to maintain its mass properties. Do such simulators also contain liquids if necessary?
Quote from: mmeijeri on 04/19/2013 07:16 amQuote from: Jim on 04/19/2013 07:12 amThis is help the spacecraft to maintain its mass properties. Do such simulators also contain liquids if necessary?I have never heard of liquid mass simulators except for those intended experiments on the early Saturn Is.....
Orbital:Today's weather briefing result - looks good for Sat. Antares launch attempt. T-0 time still 5:00 p.m. Window from 5:00 to 7:00 p.m.New launch day thread late tonight or early tomorrow (depending on where you are in the world )