Author Archives: gravityloss

USA to Exit Paris Climate Accord

According to some, a letter by 22 republican senators influenced Trump. Here it is as pdf. (It didn’t seem easy to get the plain text. Got it from Inhofe’s senate page.) The content of the letter is just about the … Continue reading

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Against Defamation

CEI accused Michael Mann of various things, and Mann sued for defamation. Now there’s some progress on the case. “The first line of defense you as a defendant can use in a defamation case, when you’ve done a good job, … Continue reading

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Life Starts To Resemble A Computer Game

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SpaceX Interplanetary Transport System Architecture Unveiled

They didn’t seem to optimize so feverishly for low trans Mars injection mass. Kudos for orbit refueling and planning for refueling on Mars, Asteroids, Europa, Callisto or what you have! I’m sure the architecture will still change drastically, it looks … Continue reading

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SpaceX first landing flight: data

SpaceX’s first landing flight’s data at flightclub.io

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SpaceX Did It – What It Should Do Next

Congratulations to SpaceX who landed the first stage intact. Assuming cost is roughly related to stage mass and engine count, reusing the first stage saves 9/10 of the whole rocket cost. If they can run the stage ten times, that … Continue reading

Posted in Architecture, Depot, Design, engines, industry, Launchers, Lunar, RLV:s, Spacecraft, SpaceX, Transportation | Leave a comment

“Space Is Hard” Is The Wrong Answer

They say “Space is hard” Orbital Sciences crashed a rocket equipped with two 40 year old engines. Physically that old. They were an interim solution and they were working towards new engines. We don’t know at this point if the … Continue reading

Posted in Design, engines, Homebuilt, industry, Journalism, RLV:s, Suborbital | Tagged , , , , | Leave a comment

Building rockets like disposable gloves

There’s two fundamental approaches to lower space launch cost: K-strategy: Building sophisticated reusable rockets that can fly quickly again after landing. r-strategy: Instead building simple expendable rockets by the mass as cheaply as possible. Firefly, looks to do just the … Continue reading

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Trying tumblr again

http://splitwire.tumblr.com

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Skysails

These ram air kites by Skysails power flying in a figure eight circuit can develop power and also work as ship propulsion. Ideas like this have probably been toyed by many, it’s nice to see some execution. The biggest current product is … Continue reading

Posted in airplane, Energy, Transportation | Tagged , , , | 3 Comments