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Commercial Space Flight General / Re: Orbex
« Last post by Davidthefat on Today at 06:27 PM »
Well the Twitter page disclosed it's LPG (Propane/Butane)

Interestingly, they are stating on their website that the ignition system has no moving parts or "electrics". Wonder how they would actuate valves without both of those.
Shuttle has a speedbreak and speedbreak setting is input to Theta Limits.  Why is it impossible for an airliner Theta Limits to use throttle setting as an input?

The Theta limits for an aircraft depends on a number of factors including thrust, weight, and wind speed.

For the space shuttle the weight is a given, the thrust is zero, and for the shuttle moderate wind speeds probably have a negligible effect.  Since all these variables are constant throughout the landing of the shuttle, the theta values are constant. 

For a powered aircraft the weight, thrust, and wind speed are constantly changing. It would have to be recalculated for every combination of weight, thrust, and wind speed.  I suppose you could have a computer continuously calculate it.  I am not sure what the point would be since if you don't like the value you can just increase thrust. 
Commercial Space Flight General / Re: Orbex
« Last post by ringsider on Today at 06:10 PM »
Orbex and Elecnor Deimos Form Strategic Partnership for Satellite Launches

Elecnor Deimos Invests in Orbex; Orbex Selected as Preferred Supplier of Launch Services for Elecnor Deimos Satellites; Elecnor Deimos to Become Orbex’s Preferred Supplier of Critical Launch Systems Including GNC

Hmm. It's quite interesting that they managed to get this level of investment and commercial traction while keeping so far under the radar. That would indicate they have done more (to convince those investors / partners) than they are making public - several images on Twitter hint at AM engines, large carbon tanks.

@Nehkara: "Mr. Steven being tested today, including what appears to be dropping or lowering a fairing half from a crane into the net."
Parker Solar Probe--Mission Overview

NASA Goddard
Published on Jul 20, 2018

Parker Solar Probe will swoop to within 4 million miles of the sun's surface, facing heat and radiation like no spacecraft before it. Launching in 2018, Parker Solar Probe will provide new data on solar activity and make critical contributions to our ability to forecast major space-weather events that impact life on Earth.

In order to unlock the mysteries of the corona, but also to protect a society that is increasingly dependent on technology from the threats of space weather, NASA will send Parker Solar Probe to touch the Sun.

In 2017, the mission was renamed for Eugene Parker, the S. Chandrasekhar Distinguished Service Professor Emeritus, Department of Astronomy and Astrophysics at the University of Chicago. In the 1950s, Parker proposed a number of concepts about how stars--including our Sun- -give off energy. He called this cascade of energy the solar wind, and he described an entire complex system of plasmas, magnetic fields, and energetic particles that make up this phenomenon. Parker also theorized an explanation for the superheated solar atmosphere, the corona, which is - contrary to what was expected by physics laws -- hotter than the surface of the sun itself.

This is the first NASA mission that has been named for a living individual.

How NASA's Parker Solar Probe Will Survive the Sun

Published on Jul 20, 2018

NASA's Parker Solar Probe is heading to the Sun.Thermal Protection System Engineer Betsy Congdon (Johns Hopkins APL) outlines why Parker can take the heat. More: | NASA launch schedule:

Music credit: Cheeky Chappy [Main Track] by Jimmy Kaleth, Ross Andrew McLean Credit: NASA's Goddard Space Flight Center Genna Duberstein (USRA): Lead Producer/Lead Editor Rob Andreoli (AIMM): Lead Videographer Betsy Congdon (Johns Hopkins University/APL): Lead Engineer Ryan Fitzgibbons (USRA): Narrator Genna Duberstein (USRA): Writer Steve Gribben (Johns Hopkins University/APL ): Animator Brian Monroe (USRA): Animator Josh Masters (USRA): Animator Michael Lentz (USRA): Animator Genna Duberstein (USRA): Animator Mary P. Hrybyk-Keith (TRAX International Corporation): Illustrator This video is public domain and along with other supporting visualizations can be downloaded from the Scientific Visualization Studio at:

Launch window opens on 6 Aug. is 04:08 EDT (08:08 UTC).
First data back in early December 2018.
Parker Solar Probe will launch at solar minimum and go to solar maximum. That was not planned, just how the mission prep and solar timelines aligned for 2018 launch window.
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