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Archive for the ‘Transportation’ Category

Dual Propellant Expander

Posted in Architecture, Depot, ISRU, Lunar, NASA, RLV:s, Spacecraft, Transportation, engines, industry, tagged , , , on Thursday 2009.11.12 | Leave a Comment »

Or what you are going to call it, an unrealized proposal from Aerojet around 1984. PDF Found on NTRS.
The idea was to have two turbopumps (like on SSME), but instead operate on the expander cycle. Two heat exchangers, two turbines, two pumps. One for each propellant.
 
 
This is a LOX-hydrogen engine. Also this means that since [...]

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The Sandman

Posted in RLV:s, Transportation, engines, industry, tagged , , , on Tuesday 2009.11.03 | Leave a Comment »

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Viking Mariella Blackout

Posted in Transportation, Uncategorized, tagged , , , , , , on Saturday 2009.09.19 | Leave a Comment »

Viking Line’s Mariella passenger and car ferry was drifting without steering capability between 00:30 and 01:00 (24 hour notation) near Utö in the Gulf of Finland on saturday morning 2009-09-19. YLE and HBL have more. There apparently was some spare power on so it was not a total blackout. This made the papers while the [...]

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Airline vs Spaceline Safety

Posted in Architecture, Homebuilt, RLV:s, Suborbital, Transportation, engines, industry, tagged , , , , , , on Wednesday 2009.08.19 | 1 Comment »

62 mile club has a writeup of a beta “customer qualification program” for XCOR’s Lynx suborbital craft. This highlights the differences and current state of play. Rocketships will not be as safe as airliners in the near future, and they don’t need to be. There are millions of things that are less safe than airliners [...]

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Just A Photo

Posted in Navelgazing, Transportation, meta, tagged , , , on Monday 2009.08.10 | Leave a Comment »

A somehow in an unspecifiable way interesting composition I ran into at the slightly risque chicks and bikes blog.

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Eckerö Line Nordlandia

Posted in Motivation, Navelgazing, Transportation, meta, tagged , , , , , , , , , on Thursday 2009.07.16 | 4 Comments »

We could literally see the pier about 200 m in front of us from the rear of the ship while waiting for the tugs to tend our disabled ship in.

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Air France Flight 447

Posted in Models, Science, Transportation, industry, tagged , , , , on Wednesday 2009.06.03 | Leave a Comment »

2009-06-01 Air France flight 447 crashed with over 200 passengers on board in the Central Atlantic.
At this early point it seems the failure was initiated by severe turbulence. Wings have been known to snap off because of very strong up- and downdrafts. In this case it might not have been so severe, but a failure [...]

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Magic Highway and the Astounding World of the Future

Posted in Demotivation, Humor, Transportation, idiocracy, tagged , on Monday 2009.06.01 | Leave a Comment »

Changes of lifestyle in the future have indirect effects that are perhaps unexpectable to some but were probably predicted by many.

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Coal Uses Oil

Posted in Climate, Energy, Global, Motivation, Transportation, industry, tagged , , , , , on Monday 2009.03.30 | Leave a Comment »

Uh oh. If Iain is correct, coal burning in the USA is oil burning as well, since the trains run on diesel and the amounts of coal needed per Joule are so vast, that almost half of coal’s cost at the powerplant is actually oil cost. It’s an old post, but I had never come across [...]

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Optimum Rocket Cruise

Posted in Architecture, Demotivation, Humor, Motivation, RLV:s, Science, Spacecraft, Suborbital, Transportation, Uncategorized, tagged , , , on Friday 2009.03.20 | 2 Comments »

With some caveats. Let’s assume a rocket is launched, and accelerates to constant speed v_c. Then it stays cruising at this speed and at a constant altitude. Landing is disregarded.
The cruise
We must modify the rocket equation slightly for the cruise: dm/dt is mass flow, v_ex is effective exhaust velocity, F [...]

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