|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Orion Max Q abort test
Apparently the Boeing Starliner is the only manned capsule not being
required to do a full up Max Q abort test. I just saw that the test for Orion is scheduled for TODAY. The test isn't using an SLS (which, honestly, wouldn't seem to be a requirement) but will launch on old ICBM solid motors to get the capsule up to Max Q speed and altitude, at which point the LM abort system will fire to demonstrate its performance in that aerodynamic regime. -- "The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." --George Bernard Shaw |
#2
|
|||
|
|||
Orion Max Q abort test
On 7/2/2019 7:51 AM, Fred J. McCall wrote:
Apparently the Boeing Starliner is the only manned capsule not being required to do a full up Max Q abort test. I just saw that the test for Orion is scheduled for TODAY. The test isn't using an SLS (which, honestly, wouldn't seem to be a requirement) but will launch on old ICBM solid motors to get the capsule up to Max Q speed and altitude, at which point the LM abort system will fire to demonstrate its performance in that aerodynamic regime. Fred is this happening at the Cape? Dave |
#3
|
|||
|
|||
Orion Max Q abort test
On 7/2/2019 9:02 AM, David Spain wrote:
On 7/2/2019 7:51 AM, Fred J. McCall wrote: Apparently the Boeing Starliner is the only manned capsule not being required to do a full up Max Q abort test.Â* I just saw that the test for Orion is scheduled for TODAY.Â* The test isn't using an SLS (which, honestly, wouldn't seem to be a requirement) but will launch on old ICBM solid motors to get the capsule up to Max Q speed and altitude, at which point the LM abort system will fire to demonstrate its performance in that aerodynamic regime. Fred is this happening at the Cape? Dave Answered my own question. Yes it was at the Cape, LC-46 and yes it already took place at 7am EDT (1100 UTC) this morning. You needed to be an early(ier) bird for this one. Details available on the NASAspaceflight.com website he https://www.nasaspaceflight.com/2019...t-test-launch/ According to the article they used a modified Peacekeeper missile using the SR-118 solid motor. According to Wikipedia this is the first stage motor from the old MX system. A 500,000 lbf (2.2 MN thrust) Thiokol SR 118. https://en.wikipedia.org/wiki/LGM-118_Peacekeeper Dave |
#4
|
|||
|
|||
Orion Max Q abort test
After having skimmed the article, it'd be more fair to characterize this
test as a test of the SLS/Orion Launch Abort System (LAS) minus the Orion capsule. Test recorders were placed abort a "test vehicle" designed to duplicate the Orion capsule on the outside but minus anything on the inside except for data recorders which are to be ejected during post abort free fall. The test article has no parachutes and was designed to free fall into the ocean and not be recoverable only the data recorders. The objective of the test is to characterize the performance of the LAS under load conditions similar to what would be experienced by SLS/Orion at near MAX Q. IMHO: I'd characterize it as kind of a piece-wise method of testing rather than an "all-up" scenario. Given the cost of SLS I can understand the approach. Understand doesn't necessarily mean I agree. I'd need more data. Dave |
#5
|
|||
|
|||
Orion Max Q abort test
Some photos:
Test article return attitude: https://twitter.com/ChrisG_NSF/statu...304896/photo/1 Water contact... https://pbs.twimg.com/media/D-eWgOKWkAEfiBj.jpg:large Dave |
#6
|
|||
|
|||
Orion Max Q abort test
|
#7
|
|||
|
|||
Orion Max Q abort test
JF Mezei wrote on Fri, 5 Jul 2019
14:58:50 -0400: On 2019-07-02 09:33, David Spain wrote: IMHO: I'd characterize it as kind of a piece-wise method of testing rather than an "all-up" scenario. Given the cost of SLS I can understand the approach. Understand doesn't necessarily mean I agree. I'd need more data. Is Max-Q defioned by the topmost component? aka, maximum aerodynamic pressure on Orion? Well, the front bit IS where you get peak aerodynamic pressure. I would have thought that was so obvious as to not need clarification. Note that this is why Max Q for Falcon 9 with a capsule is different from Falcon 9 with a payload fairing. If you substitude the booster, is it realitively easy to get the capsule to reach the Max-Q speed at the right altitude to reproduce the Max Q it would experience with an SLS ? Depends on what you substituted the booster with. If they can get Orion to same speed/altitude as the MaxQ would bve experienced with SLS, doesn t the abort test then properly reprodiuce the Orion's ability to "take off" from its booster ? Except nothing was 'real' on that test except the escape system itself. The booster was obviously different and the capsule was instrumented boilerplate and not a real Orion capsule. They didn't even test that the parachute system would work on such an abort because there was no parachute system installed. -- "Some people get lost in thought because it's such unfamiliar territory." --G. Behn |
#8
|
|||
|
|||
Orion Max Q abort test
On 7/5/2019 2:58 PM, JF Mezei wrote:
On 2019-07-02 09:33, David Spain wrote: IMHO: I'd characterize it as kind of a piece-wise method of testing rather than an "all-up" scenario. Given the cost of SLS I can understand the approach. Understand doesn't necessarily mean I agree. I'd need more data. Is Max-Q defioned by the topmost component? aka, maximum aerodynamic pressure on Orion? Already answered by Fred. If you substitude the booster, is it realitively easy to get the capsule to reach the Max-Q speed at the right altitude to reproduce the Max Q it would experience with an SLS ? Well yes. I think they would have designed the test so that the SR118 engine would get the test article within that regime. If they can get Orion to same speed/altitude as the MaxQ would bve experienced with SLS, doesn t the abort test then properly reprodiuce the Orion's ability to "take off" from its booster ? Yes this was the point of this test. To that end I'm assuming the "test article" aka the capsule replica was a mass equivalent to the Orion. It was a shape equivalent on the exterior according to what I've read. But object of the test was the LAS itself. Not the recovery mechanisms for the Orion, since this was not an Orion that was flown. Dave |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Pad Abort Test 1 success | Damon Hill[_3_] | Policy | 5 | May 9th 10 03:38 PM |
Pad Abort Test 1 success | [email protected] | Space Shuttle | 0 | May 7th 10 07:03 PM |
Ares I fratricide on Orion during abort | Pat Flannery | Policy | 75 | July 22nd 09 01:34 AM |
Orion Max Launch Abort test vehicle | Pat Flannery | History | 11 | June 15th 09 02:04 PM |
CEV abort test booster | Pat Flannery | History | 25 | October 4th 06 07:07 AM |