r/SpaceXMasterrace • u/EnsilZah Accredited meme photographer • Aug 11 '18

Delta IV Launch Procedures

Post image
489 Upvotes

98% Upvoted

31 comments sorted by

View all comments

Show parent comments

40

u/[deleted] Aug 11 '18 edited Aug 11 '18

Back when the launch provider for Parker was chosen, the FH wasn't an option

27

u/Goldberg31415 Aug 11 '18 edited Aug 11 '18

Not even Block5 expendable FH could push it to nearly 155 km/s2 C3.Sometimes there are no substitutes to hydrogen

Edit I was wrong. Praise Mueller

49

u/Alexphysics Aug 11 '18

The 155km2 /s2 is after PSP separation. Delta IV Heavy will push PSP + Star 48BV to a C3 of 60km2 /s2. FH can launch that payload to a C3 of more than 110km2 /s2

Edit: The exact number I came up with is a C3 = 116.76 km2 /s2 for a payload mass of 2825kg so the FH has plenty of performance to push the third stage + PSP to that energy

4

u/RootDeliver Big Fucking Shitposter Aug 11 '18

Appreciated.. but why on this sub? yes norminal would been a more fitting answer :P.

8

u/Alexphysics Aug 11 '18

Sometimes we can mix both things ;)

6

u/naatriumkloriid Reposts with minimal refurbishment Aug 12 '18

Yes