[AR] Re: Congrats SpaceX
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Tue, 6 Feb 2018 23:44:02 -0500 (EST)
On Tue, 6 Feb 2018, Paul Mueller wrote:
Interesting that the FH is roughly the same size as the Delta IV Heavy, but
it has a much larger payload capacity to LEO. And this is with
lower-specific-impulse engines than the LOX-LH2 engines on the Delta IV
Heavy. Does anyone have the gross liftoff weight of the two rockets for
comparison (Henry S)?
As others have already noted, about a factor of 2: 1421t vs. 733t. And
the effects of the lower Isp are largely eliminated by the much better
mass ratios which come with dense propellants.
Similarly, the single-core Delta IV configurations generally have less
payload than comparable Atlas Vs despite being larger.
Henry
Other related posts: