SpaceX details its plans for landing 3 Falcon Heavy boosters

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SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby CATO » Thu Feb 09, 2017 3:00 pm

SpaceX details its plans for landing three Falcon Heavy boosters at once

Can't wait for this..............

https://arstechnica.com/science/2017/01/spacex-details-its-plans-for-landing-three-falcon-heavy-boosters-at-once/
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby SpaceManMat » Thu Feb 09, 2017 5:58 pm

Very cool, I wonder if they are concerned with thrust interference.

2 side boosters first then the center, or all 3 at once?
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby martymonsta » Fri Mar 03, 2017 7:07 pm

SpaceManMat wrote:Very cool, I wonder if they are concerned with thrust interference.

2 side boosters first then the center, or all 3 at once?


The landing pads are 300m apart, I can't see why there would be any interference.

Usually, rockets that have a core and boosters, eg. Delta IV Heavy, operate the centre core at lower thrust (55%) from just before Max Q till Booster separation to reduce aerodynamic loads and increase the burn time of the centre core. I had a preconception that the Falcon Heavy would do something similar, but SpaceX doesn't follow tradition so I guess we will have to wait and see.
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby CATO » Fri Mar 03, 2017 7:10 pm

SpaceManMat wrote:Very cool, I wonder if they are concerned with thrust interference.

2 side boosters first then the center, or all 3 at once?



"In thrust we trust"

AMRS 21 L3
TRA 07459 L3

Impulse:
2018: 14,767 Ns (44% N)
Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: 1.14M

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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby martymonsta » Fri Mar 03, 2017 7:13 pm

Well there you go, we didn't have to wait that long to see. Thanks, David.
Many years ago the great British explorer George Mallory, who was to die on Mount Everest, was asked why did he want to climb it. He said, "Because it is there."
Well, space is there, and we're going to climb it

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AMRS #41 L2/LCO/RSO/CO

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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby OverTheTop » Fri Mar 03, 2017 7:32 pm

The early Merlin engines could only throttle down to about 70% thrust. They have made some tweaks so now they are probably almost considered deep throttleable, able to operate down to 39% for the 1D variant used on the FH. Must be some cleverness in there :)
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby SpaceManMat » Fri Mar 03, 2017 7:57 pm

Just had the thought, are those 2 boosters actually coordinating with each other. Normally in space you would not operate in close proximity to another vehicle like that. It's particular risky for a colision coming back down to the same location through re entry. They may opt to add in some additional separation to their paths and perhaps also the landing timing.
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby OverTheTop » Fri Mar 03, 2017 8:12 pm

I am guessing they will have two completely separate flight corridors for spatial separation. They would possibly slightly temporal separation as well, by having a delay between burn maneuvers.
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby SpaceManMat » Sat Mar 04, 2017 10:30 am

If one looses control during landing 300 meters is a bit close. Probably want to leave enough of a timing gap for it to crash and burn. Even the explosion shock wave could cause issues especially if the other is just trying to touch down. 30 seconds would see the worst of the mayhem out the way. Possibly they would even want to the option to divert to an alternative pad, might need a bit longer for that.
QRS: 124
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Fastest Flight: Mach 1.55
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby OverTheTop » Sat Mar 04, 2017 10:33 am

I think a delta t of 30s is a bit unreasonable to support (but probably not totally out of the equation).

They will have done an FMEA and various other analyses to keep their risks down.
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby SpaceManMat » Sat Mar 04, 2017 10:52 am

My thought is that during boost back you fire the first booster at a lower angle than normal and give it a higher horizontal velocity. The second boost waits a couple of seconds longer before firing at an angle higher than normal with a higher vertical velocity (lob shot). You would need to make some adjustments during the reentry burn and you'd consume a bit more fuel, but would give them a reasonable separation. Keep in mind that the longest part of the whole landing procedure is boost back.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby CATO » Sun Apr 02, 2017 7:15 am

Elon's latest tweet... :shock: :shock: :shock:

Considering trying to bring upper stage back on Falcon Heavy demo flight for full reusability. Odds of success low, but maybe worth a shot.

https://twitter.com/elonmusk/status/847882289581359104
"In thrust we trust"

AMRS 21 L3
TRA 07459 L3

Impulse:
2018: 14,767 Ns (44% N)
Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: 1.14M

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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby CATO » Sun Apr 02, 2017 8:06 am

WASHINGTON — SpaceX plans to conduct the debut launch of the Falcon Heavy rocket this summer using two boosters that have already flown on other missions, SpaceX Founder and Chief Executive Elon Musk said March 30. - See more at: http://spacenews.com/spacex-to-launch-falcon-heavy-with-two-flight-proven-boosters-this-year
"In thrust we trust"

AMRS 21 L3
TRA 07459 L3

Impulse:
2018: 14,767 Ns (44% N)
Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: 1.14M

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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby SpaceManMat » Thu Apr 27, 2017 4:43 pm

Couple of photos of the Falcon Heavy core 8)

image.jpg


image.jpg
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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Re: SpaceX details its plans for landing 3 Falcon Heavy boosters

Postby martymonsta » Thu Apr 27, 2017 6:14 pm

That's a pretty cool find Matt. It doesn't look like they are going to attempt a core stage landing given the lack of grid fins.
Many years ago the great British explorer George Mallory, who was to die on Mount Everest, was asked why did he want to climb it. He said, "Because it is there."
Well, space is there, and we're going to climb it

MARS #21
AMRS #41 L2/LCO/RSO/CO


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