Tag Archives: Pi

Jun 24 2019

Apollo 11 Saturn V Launch Camera E-8


Published on Apr 7, 2013

This clip is raw from Camera E-8 on the launch umbilical tower/mobile launch program of Apollo 11, July 16, 1969. This is an HD transfer from the 16mm original. Even more excellent footage is available on our DVDs at our website at http://www.spacecraftfilms.com The camera is running at 500 fps, making the total clip of over 8 minutes represent just 30 seconds of actual time.
Jun 23 2019

Reaction Wheels – Things Kerbal Space Program Doesn’t Teach


Published on Jul 9, 2016

Reaction wheels in Kerbal Space Program might actually refer to a number of different technologies used to control the attitude of spacecraft. Let’s go into some detail about these.
Jun 23 2019

How Gravity Assists Work


Published on Sep 25, 2017

Time to clear up some misconceptions and show how a spacecraft’s close encounter with a planet can change a spacecraft’s orbit and enable trajectories beyond its available delta-v. I specifically cover some of the math and look at the unusual trajectory employed by the OSIRIS REx mission.
Jun 23 2019

Geostationary, Molniya, Tundra, Polar & Sun Synchronous Orbits Explained


Published on Jan 10, 2019

Illustrating different classes of orbits commonly used by satellites in Earth orbit, there are special classes of orbit designed to solve certain problems and the physics behind them is important. All the orbits are displayed using Universe Sandbox 2. Buy it here: https://www.humblebundle.com/store/un…
Jun 23 2019

Heat Shields – Things Kerbal Space Program Doesn’t Teach


Published on Dec 29, 2018

The science of Aerothermodynamics covers what happens during a spacecraft’s fiery flight through a planetary atmosphere as it sheds speed, converting kinetic energy into thermal energy. This represents a complex interaction between fluid mechanics, thermal radiation and chemistry. The engineering required to shield hardware against this intense heating is an equally complex multi disciplinary art. If you want to learn the math then this course offered an excellent overview: https://tfaws.nasa.gov/TFAWS12/Procee…
Jun 23 2019

Graveyard Orbits Where Old Satellites Are Forgotten


Scott Manley
Published on Jun 21, 2019
When a satellite is designed these days it’s also important to think about what happens at the end of its lifetime, for more LEO satellites they’ll happily decay and fall into the atmosphere on their own. But there are many cases where this can’t happen, either because the spacecraft doesn’t have the fuel, or because the satellite is dangerous. For these, there’s a retirement home in the graveyard orbit.

Jun 23 2019

Swedish Scientist Debunks Rising Sea Levels


Armstrong Economics Blog/Climate

Re-Posted Jun 23, 2019 by Martin Armstrong

 

Jun 22 2019

How To Make Sure Ships Don’t Sink | Built From Disaster | Spark


Published on May 31, 2019

Advances in boat technology, including the design features that allow passenger ships to operate safely.
Jun 22 2019

Climate Change & Solar Minimum


Armstrong Economics Blog/Climate

Re-Posted Jun 19, 2019 by Martin Armstrong

COMMENT:

Hello Martin,

You’ve covered the topic of increasing seismic activity and the correlation with climate change extensively in your daily blog.

Since the solar activity started to decline (cycle 24) around +/- 2014-2015, it seems that the rate of earthquakes and volcanic eruptions are increasing worldwide.

Below I have added some links as reference to very recent (violent) volcanic explosions. I have also included a link to an overview of actual active volcanoes on earth. It is predicted that solar cycle 24 will end around 2021-2022 (https://en.wikipedia.org/wiki/Solar_cycle_24#/media/File:Solar_cycle_24_sunspot_number_progression_and_prediction.gif) meaning that seismic activity will increase.

I cannot make the claim that there is an increase in seismic activity but there seems to be something brewing beneath our feet. The amount of volcanic ashes which is being propelled into the atmosphere at this moment must have an adverse effect on the global temperatures, and if the correlation holds up this is just the beginning.

Best regards,

SG

https://www.volcanodiscovery.com/italy.html

https://www.volcanodiscovery.com/popocatepetl/news/81709/Popocatepetl-volcano-Mexico-strong-explosion-yesterday-morning-sends-ash-to-32000-ft-10-km-altitude.html

https://www.volcanodiscovery.com/fileadmin/maps/active-volcano-map.jpg

https://www.volcanodiscovery.com/agung/news/81518/Agung-volcano-Bali-Indonesia-strong-explosion-this-morning-ash-to-30000-ft.html

REPLY: It is truly amazing to me how unprofessional the research has been. I do not know. In hedge fund management I always had to watch what was taking place around the world, so there were constantly multiple relations going on that the research I did was always global. It seems to be just a routine check to correlate everything and see what pops up. The climate change is cyclical and earthquakes and volcanic activity rise during a solar minimum. I fail to grasp why, if you really want to do research, you have to dig up the evidence.

Leonardo da Vinci left behind drawings of human body parts. He was curious as to how the body functioned. It was said that Leonardo would often dissect unclaimed bodies, such as drunks and vagrants. Those bodies were more likely to be male. It was definitely harder to get female bodies to dissect. Nevertheless, Leonardo found one dead pregnant woman to dissect to try to understand how everything worked. That is how research is done. You have to check all possibilities if you want to call it research rather than propaganda. As with the arguments for human-induced climate change (as distinguished from pollution), we cannot simply make assumptions and then assume something that has risen five years in a row will do so forever. That type of forecast in financial markets would be laughed at by everyone. Still, this is how the dire forecasts are being made in climate change and it seems to be simply to get money and fame.

Jun 19 2019

Why do cylindrical rockets roll?


Everyday Astronaut

Here’s a fun question that not only have I myself asked, but I get asked fairly often, why do we hear a call out like “roger roll” or “roll program complete” at which point we can see the rocket rotate or roll on its X axis… The best example of this was the Space Shuttle which had a very obvious and dramatic roll program. As soon as it cleared the tower, you can see it making a very impressive and sometimes scary looking roll. Now a maneuver like this makes sense when a vehicle is asymmetrical like the Space Shuttle, but why do cylindrical rockets like the Saturn V, Titan, Atlas, Delta IV etc etc even bother doing a roll? Can’t rockets just tip over in whatever direction they need to go? Do a little pitch here, a little yaw there just as long as the pointy end is going the direction it’s intended to go, who cares which side of the rocket is facing the Earth and which side is facing space… right? So today we’ll first define the pitch, yaw, roll and their corresponding axis on a rocket, then we’re going to dive into why a rocket rolls in the first place, take a look at launch azimuths and their relationships to trajectories and we’ll look at some unique solutions to orientations including some rockets that don’t roll on ascent to align with their trajectory.