09-07-2022, 11:42 AM | #379 | |
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It's too bad we didn't continue to use and modernize the Saturn V over time, in conjunction with the Shuttle program. To rebuild it now you would basically have to start over since the personnel, rigs, group knowledge, are long gone.
Here's one thing I didn't know until I was reading this article about NASA refiring one of the Saturn V main engines. Just the fuel pump on a main engine produced 31,000 lbs of thrust. Quote:
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09-07-2022, 12:54 PM | #380 |
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It's not the first time older thrusters have been repurposed - here's more insight:
https://www.wired.com/story/nasas-sp...-new-vehicles/
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09-07-2022, 01:43 PM | #381 |
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It doesn't bother me they are repurposing the parts, but taking them from a multi-mission platform to a one and done doesn't make much fiscal sense to me, even if they were mothballed.
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09-07-2022, 02:30 PM | #382 | |
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It's a thruster, so there's not much of a difference between one used on a multi-mission platform and a 'one and done'. The R40b has been through multiple space shuttle missions already, so we've got our money's worth out of it. Rather than let it sit unused, it makes fiscal sense to clean it up and put it to good use. I'd be more concerned if they ordered a brand new thruster costing us taxpayers more, when they had some that met the mission requirements in storage.
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09-07-2022, 02:40 PM | #383 |
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Which required extensive overhaul. It might actually make more economic sense to use them once in the SLS case.
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09-07-2022, 03:10 PM | #384 | |
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09-07-2022, 03:18 PM | #385 | |
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Understood and point taken. Here's some info on the particular thruster in the article: http://www.astronautix.com/r/r-40b.html A thruster itself (not an entire propulsion system) is a relatively simple component (nozzle with some valves) that isn't difficult to integrate. Thrusters are made by a host of different manufacturers and it's common to select different ones even in the same platform product line, as long as performance requirements are met. It ain't rocket science. Oh wait, it is, lol.
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09-07-2022, 04:11 PM | #386 |
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That's exactly what they are doing (see article above). They have 24 new multi-mission/one shot engines on order.
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09-07-2022, 04:43 PM | #387 | |
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If there are none in storage that meet existing requirements, then that's what they have to do. Sounds logical to me. Or, are you saying that they have existing thrusters in storage that would work, but they're not using?
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09-07-2022, 05:05 PM | #388 | |
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09-07-2022, 08:11 PM | #389 |
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No, I'm saying they are spending money on overbuilt thrusters for a single use. Whether they have to be overhauled between launches they are still more expensive than they need to be for a "throw away"
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09-07-2022, 08:40 PM | #390 | |
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Also, according to Wikipedia the first 4 SLS flights use existing Shuttle engines, while the newly manufactured ones are "simplified RS-25E variant". Although this does fall into the typical government thinking of "lets use these spare parts now for cheap, even though they'll cost us a lot more in the long run - that's a problem for the next person to hold office". |
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09-07-2022, 10:34 PM | #391 |
extra what?
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Minimum order for price break on alibaba
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09-07-2022, 11:57 PM | #392 |
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I guess the point is they've already been built and (mostly) paid for, vs. designing and manufacturing brand new expendable rocket engines. 'Overbuilt' can also mean a greater factor of safety and reliability. Either way, it's over budget and late - I'm disappointed as well.
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