#31
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I was kinda scratching my head too about the infrared camera view and not visible light color. Plenty of daylight for it, but for whatever reason they stayed with the infrared feed all the way down. Didn’t help hearing the NASA commentator ladies talk about the pretty red, whit and blue canopies. Oh well. Down safe...that was key I guess. But yes, still some wrinkles to iron out on those thrusters.
Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#32
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Yes - they are super close together. It's a tight fit coming out of the inter-stage adapter! |
#33
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It makes sense though. The biggest reason to separate them more, I think, would be if they were on a first stage, there could be overheating issues. In vacuum, that is not an issue. I even wonder if the two use a parallelogram linkage in the yaw axis to assure they stay the same distance apart. If one engine shut down early, and "stuck" where it was, the offset thrustline would cause the good engine to yaw outwards to get the thrustline thru the CG, so no engine collision issues. But if one shut down, I do not know if there is any roll control capability. It would need to be significant roll control too, due to fuel sloshing problems in a "tilted" tank (tilted relative to the off-center thrust vector). In the video, shortly after ignition, you could see the two engines "scissoring" a bit to make roll corrections till it settled down.
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Contest flying, Sport flying, it's all good..... NAR# 18723 NAR.org GeorgesRockets.com Georges'CancerGoFundMe: https://www.gofundme.com/f/help-geo...ay-fight-cancer Last edited by georgegassaway : 05-26-2022 at 06:46 PM. |
#34
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Here is a still of the (as I call them) "Nice Pretty Chutes" that we did not get to see (well, we did not see the colors) in the live coverage of the landing yesterday due to the constant infrared video feed NASA used for the landing coverage.
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#35
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Yeah, they kept switching over to infrared. I mean, ????
I thought the coverage at the start was good, but as it deteriorated I got so ticked off I turned off the channel with 2 minutes to go to touchdown. Grrrrr. |
#36
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OFT-2 Starliner landing (slow parts sped up)
May 25, 2022 https://www.youtube.com/watch?v=gPFS8Bp643o On the ground: https://newsatcl-pctr.c.yimg.jp/t/a...-000-2-view.jpg
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The other day I sat next to a woman who has a profound fear of flying. I wanted to comfort her, so I said, "Don't worry, we're not gonna' crash. Statistically, we got a better chance of being bitten by a shark." Then I showed her the scar on my elbow from a shark attack. I said, "I got this when my plane went down off of Florida." - Dennis Regan |
#37
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From the link just provided, infrared was much higher resolution than the visible wavelength footage.
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I love sanding. |
#38
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Actually, base heating remains a real concern. The engines still radiate quite a bit of heat. The spacing was driven by the gimbal angles. Fortunately, they don't gimbal that far, and no, there is no physical linkage between the two. If they were somehow commanded to gimbal towards one another, they won't hit. The other big driver is the diameter of Centaur, which drives the diameter of the interstage. It's an incredibly tight fit. They engines simply cannot be further apart. On Centaur V, the engines ARE much further apart. This is because they have the room (partly) but also because they are then able to use larger nozzle extensions. Not the deployable extension you see on Delta IV, but a big extension is planned to get that all-important large, vacuum expansion ratio. If one engine shut down, roll control could only be provided by RCS thrusters (as it is on every single engine Centaur mission). If this happened on a Starliner mission, I believe it would result in an abort by Starliner. On every mission (single and dual), the engines always "wiggle" a bit at ignition. Some of that is driven by ignition transient, some is driven by the guidance system finding the "true" engine null position (zero pitch, zero yaw) versus the calculated null position. Engines are made by humans, so there are usually very minor differences. |
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