Author Topic: Elon Musk Reddit AMA on BFR  (Read 47344 times)

Offline intrepidpursuit

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Re: Elon Musk Reddit AMA on BFR
« Reply #160 on: 10/19/2017 08:08 PM »
They have to be independently TVC so that you can get roll as well as left right top bottom.

EDIT: of course cold gas thrusters could do the roll correction.

Falcon 9 doesn't have roll correction via TVC on landing. Seems like the split flaps and the pressure fed methane thrusters would be sufficient for roll control.

Offline MP99

Re: Elon Musk Reddit AMA on BFR
« Reply #161 on: 11/05/2017 06:02 PM »
I don't think this is likely, but...

A BFR heavy (3x BFR cores) could launch a heavier tanker which fills much more of the volume of BFS. I don't see this as an FH style where the boosters separate, but where the three cores are permanently and rigidly connected, so would land together and be ready for rapid recycling.

This assumes that a heavier BFS would not suffer excessive gravity losses after staging (or might be upgraded with more vac Raptors). It also assumes that SpaceX get comfortable with FH, and ultimately decide that it's not so hard to replicate after all.

Alternatively, early 12m boosters might start out launching only 9m tankers until it has the flight history to prove it safe for launching more valuable cargos.

Cheers, Martin

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Offline Peter.Colin

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Re: Elon Musk Reddit AMA on BFR
« Reply #162 on: 11/05/2017 06:46 PM »
A single 9 meter booster could also launch a 12 meter tanker with a dry weight of 235 tons to LEO.
« Last Edit: 11/05/2017 06:51 PM by Peter.Colin »

Offline hkultala

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Re: Elon Musk Reddit AMA on BFR
« Reply #163 on: 11/05/2017 06:55 PM »
A single 9 meter booster could also launch a 12 meter tanker with a dry weight of 235 tons to LEO.

There is no need nor a point for a 12-meter 235 tonne tanker, and it makes absolutely no sense at all.
« Last Edit: 11/05/2017 10:40 PM by hkultala »

Online drzerg

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Re: Elon Musk Reddit AMA on BFR
« Reply #164 on: 11/05/2017 10:02 PM »
one tanker could be specificly designed for long term storage on orbit, more like depo then tanker. regular tankers are fast and light and have only role to delivering fuel from point to point.

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