F-22Raptor
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SpaceX launches the Crew-9 mission to the ISS; lands booster 352nd time, 94 total launches this year
All things SpaceX - Updates and Discussion
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SpaceX launches the Crew-9 mission to the ISS; lands booster 352nd time, 94 total launches this year
Hamartia Antidote
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SpaceX Starlink Passing 4 Million Customers Towards 10 Million in 2025 | NextBigFuture.com
In May, Nextbigfuture projected that Starlink could reach 3.5 to 5 million customers at the end of 2024 and SpaceX has revealed they are passing 4 million
www.nextbigfuture.com
SpaceX Starlink Passing 4 Million Customers Towards 10 Million in 2025
Hamartia Antidote
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High Volume SpaceX Starship flights Can use Space Tether to Save Fuel | NextBigFuture.com
There is a re-examination of space tethers and skyhooks to find near terms use cases. Harsimony at Greaterwrong.com provides the analysis of value for tethers
www.nextbigfuture.com
There is a re-examination of space tethers and skyhooks to find near terms use cases. Harsimony at Greaterwrong.com provides the analysis of value for tethers when we have a lot of space launches and space activity.
A tether that spins at 1.74 km/s is ideal for some boosting to the moon. The fuel cost per launch is 293 tonnes, less than half the 713 tonnes we needed originally. The required size of a tether spinning at this speed is 1310 tonnes, which should take roughly 10 launches to build.
Boosting all the way to Mars for a dV of 9.31 km/s. In this case the ideal tether spins at 2.19 km/s and has a mass of 2560 tonnes. Now, the trip requires 813 tonnes of fuel versus 2230 tonnes without a tether.
You need to get more uses out of the tether and counter weight system to get more fuel saving value.
Tethers help you skip a level by bouncing you out of the orbit they’re in. They specialize in a particular transfer you want to make. That’s not always desirable. For instance, there’s not really a way to use tethers to get you from Earth to LEO, since the tether has to be in LEO already. The tether could do a “half-lift” to get you to LEO, but that doesn’t utilize their strengths very well.
Tethers generally want to operate close to their characteristic velocity. Slower and you’re wasting their potential, higher and your tether needs to be huge in order to handle the payload.
Tether repair is a big deal. The longer a material can last, the more it justifies building bigger and faster tethers, which leads to big fuel savings.
Tethers are surprisingly complex for a piece of string. Matching up rocket and tether velocities sometimes requires the tether to be in a weird orbit, and tethers orbit differently than a condensed object would. On top of that, you need to damp vibrations, keep the tether material cool and repair defects in order to get high performance. And they need a regular supply of falling mass to counter the momentum lost from boosting rockets. These considerations mean that tethers have to constantly adapt to their conditions, frequently repositioning and doing maintenance.
Small tethers make building large tethers cheaper by lowering the cost to reach higher orbits. So we can bootstrap to larger sizes.
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F-22Raptor
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SpaceX launches the ESA Hera mission; the booster was expended, 95 total launches this year
F-22Raptor
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SpaceX launches NASAs Europa Clipper spacecraft, the boosters were both expended, 96 total launches this year
F-22Raptor
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SpaceX launches another 23 Starlink satellites; lands booster 353rd time, 97 total launches this year
F-22Raptor
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SpaceX launches another 20 Starlink satellites; lands booster 354th time, 98 total launches this year
F-22Raptor
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F-22Raptor
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SpaceX launches another 20 Starlink satellites; lands booster 355th time, 99th total launch this year
F-22Raptor
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SpaceX launches the OneWeb Launch 20 mission; lands booster 356th time, 100 total launches this year
Hamartia Antidote
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SpaceX Starlink Upgrading to Gigabit Per Second Speeds | NextBigFuture.com
SpaceX has applied to the FCC to make changes to Starlink to increase communication speed from 200-300 Mbps to about 1 gigabit per second or more.
www.nextbigfuture.com
Hamartia Antidote
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F-22Raptor
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SpaceX launches another 23 Starlink satellites; lands booster 357th time, 101 total launches this year
F-22Raptor
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SpaceX launches the NROL-167 mission; lands booster 358th time, 102 total launches this year
F-22Raptor
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SpaceX launches another 22 Starlink satellites; lands booster 359th time, 103 total launches this year
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