Author Topic: Comprehensive Falcon Family Performance  (Read 10342 times)

Offline envy887

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Re: Comprehensive Falcon Family Performance
« Reply #40 on: 02/25/2018 12:12 AM »
I think people might be giving these prices a little too much credibility. How can expended side boosters raise the price $55 million, but an expended core only $5 million?

SpaceX can charge whatever price they want. An expended F9 could be $6 billion per flight and reused FH 3 for a nickel. Who says it has to make sense?
The people who pay the bill.

Who won't be complaining if SpaceX offers almost triple the performance for only $5 million more.

Offline speedevil

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Re: Comprehensive Falcon Family Performance
« Reply #41 on: 05/11/2018 11:04 AM »
From the transcript of the post-launch conference of the first block 5 launch by internetftw

Quote
Musk: The Merlin engines, the engine thrust is going to increase by approximately 8%, to 190,000 pounds of thrust at sea level. We think there's probably a little more room there, maybe going up to 10% or so.

A quick estimate approximates full thrust expendable performance at 18650kg or so, out of Canaveral to 180km.
This is low, but at least in the order of magnitude.

Increasing the liftoff thrust from 7000kN to 7560kN and the second stage by the mentioned 5% takes this to 19180kg, or 3% increase.
Adding that extra couple of percent only bumps it by a hundred kg.

This would presumably help lots more on expendable core FH launches.

Offline envy887

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Re: Comprehensive Falcon Family Performance
« Reply #42 on: 05/11/2018 12:42 PM »
From the transcript of the post-launch conference of the first block 5 launch by internetftw

Quote
Musk: The Merlin engines, the engine thrust is going to increase by approximately 8%, to 190,000 pounds of thrust at sea level. We think there's probably a little more room there, maybe going up to 10% or so.

A quick estimate approximates full thrust expendable performance at 18650kg or so, out of Canaveral to 180km.
This is low, but at least in the order of magnitude.

Increasing the liftoff thrust from 7000kN to 7560kN and the second stage by the mentioned 5% takes this to 19180kg, or 3% increase.
Adding that extra couple of percent only bumps it by a hundred kg.

This would presumably help lots more on expendable core FH launches.

It probably helps more on RTLS launches; the faster it can accelerate to staging and turn around, the less distance it has to cover on the return leg.

Offline OnWithTheShow

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Re: Comprehensive Falcon Family Performance
« Reply #43 on: 05/11/2018 01:26 PM »
Also we do not know how much mass the Block 5 improvements added to the rocket. So there may not actually be any performance improvements especially when we hear about composite structures being replaced with titanium and active water cooling.

Offline speedevil

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Re: Comprehensive Falcon Family Performance
« Reply #44 on: 05/12/2018 11:48 AM »
Considering only SpaceX costs.
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a marginal cost for a Falcon 9 launch down, fully considered, down under five or six million dollars.
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we intend to demonstrate two orbital launches of the same Block 5 vehicle within 24 hours no later than next year.

Or, in principle, eight launches in one day over four sites.
Neglecting rather a lot, and assuming they tried for on-orbit fuel transfer, a full S2 can throw ten tons clear to jupiter on a direct trajectory, or thirty tons to Mars.

For a cost to SpaceX of around the revenue of a couple of regular launches.

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