Author Topic: Alternative multi core configurations  (Read 11809 times)

Offline speedevil

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Re: Alternative multi core configurations
« Reply #40 on: 02/16/2018 05:04 pm »
Was cross feed ever considered to get the best of both worlds?

Crossfeed seems logically like it should work.

But.
The advantages to the centre core from crossfeed also mean that the boosters cutoff earlier, so you get less delta-v from them.
The dry mass of the boosters - which you throw away if crossfeeding - is usually very small compared to S1 whole mass + S2 + payload + ...
It's a _lot_ of plumbing.
Crossfeed probably means you can't get the centre core back.
You can get most of the benefit by throttling the centre core modestly.

Offline gin455res

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Re: Alternative multi core configurations
« Reply #41 on: 02/16/2018 05:36 pm »
I wonder if a falcon 5 heavy would be advantageous.

By removing four engines, you could move the remaining four outer engines inward.  This would allow the core to have bigger nozzles and improved vacuum isp.

No there isn't enough room. The center engine needs the extra gimbal range. There is no room for bigger nozzles unless you also take out the center nozzle, which means no landing/recovery.

Are you sure?

It looks fairly roomy. Not a 20% linear increase even?
And if necessary could the center nozzle be made a bit  smaller?

Offline TomH

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Re: Alternative multi core configurations
« Reply #42 on: 02/16/2018 06:14 pm »
I remember how well Jim loved (HaHa) the idea proposed by someone several years ago of the 12m Ares V core, surrounded by six more Ares V cores, and a couple more stacked atop the center as upper stages.

The guy did have some eye-candy graphics. In a way, the thing reminded me of the USS Enterprise (USN carrier) turned on end and ready to fly to Alpha Centauri. It was freakin' big, and talk about kludge/legos! Wow!

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