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#11
02-09-2022, 12:33 PM
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That's a big reason why they used kerosene for Saturn V first stage. Fuel weight isn't as critical for the first stage, and the size rocket needed to carry that much H2 was simply too much (remember what a stretch the size of the Saturn V was at the time - H2 fueled first stage would have made it massively bigger). SLS has been going on for over a decade in one form or another - with vastly improved technology over what we had in the 1960's - and still hasn't flown. The Saturn V went from concept to taking men around the moon in ~7 years. Oh how the mighty have fallen...  
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#12
02-09-2022, 12:37 PM
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This unmanned flight will orbit then return. The next flight is supposed to be manned and will be an elongated version of Apollo 13's profile. It is supposed to take humans farther from earth than ever before.
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#13
02-09-2022, 01:53 PM
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Sorta. The current article's structure is supposed to be about 25% lighter than the EFT spacecraft. The EFT didn't have any life support, seats, etc. IIRC. It also didn't have the recently delivered ESA built service module. Instead, the capsule was attached to a boilerplate of the SM, again IIRC. Someone that keeps up with it better than me can chime in.
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#14
02-09-2022, 02:54 PM
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No real sense of urgency since the Apollo/Saturn V missions to the moon.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !
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#15
02-09-2022, 07:11 PM
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I won’t do the extended math, but a gallon of liquid hydrogen weighs .59 pounds. A gallon of kerosene weighs 6.82 pounds. So, yeah.... Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970
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#16
02-09-2022, 07:37 PM
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If they really wanted to save weight they'd store it in its gaseous form!   
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Scott D. Hansen Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe! Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies! Ye Olde Rocket Forum WOOSH NAR Section #558
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#17
02-09-2022, 08:31 PM
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Ooh, yeah! A dirigible airship strapped to each side of the rocket! There’d be a bit of a drag ‘hit’, but the greatly reduced weight should cover for that!! Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970
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#18
02-09-2022, 09:16 PM
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Not to mention the additional lift of the gas.... Mike
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#20
02-24-2022, 08:35 AM
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The four spaced out RS-25's hanging under SLS look like four little teats on a heifer's udder after years of drooling over the five massive F-1's on the Saturn V and even the tight cluster of 9 Merlins on the Falcon-9. However, this shot up close looks pretty cool.
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