Category Archives: Technology and Society

Business, Social Commentary, Space, Technology and Society

Plasma Jet Electric Thrusters

21 Comments

An interesting Kickstarter project.

Via (former co-blogger) Andrew Case, who writes:

It will be interesting to see if crowd funding of space projects is viable. I know that there’s a guy who successfully funded a project to study a lunar space elevator, but as far as I know this is the first that is focused on something practical that has a real chance of flying in the short term.

I’d be interested to hear your thoughts on the subject.

I think it’s very viable, and a useful model for the future. It will be even better when we can start crowd funding actual businesses via the JOBS Act, and not just technology development.

[Late evening update]

Yeah, I know, I know. I was gone all day, and Trent provided it in comments, but here’s the link.

[Update a few minutes later]

Ignore my response to Paul Breed in comments. Doug Messier is now reporting that the engine exploded. If so, that puts a different complexion on things, but it still proves out their engine-out capability for the first stage, including shrapnel shield. The question is, as Paul notes, what are the differences between first and second-stage Merlins, if any, that can give us confidence in the second-stage reliability? Also, what would have happened to the Dragon had it happened on second stage? Just a loss of thrust, or an explosion of the entire stage (that is, would the explosion have taken out the tanks above as well, or does it have a similar shrapnel shield)?

In terms of commercial crew, the former wouldn’t necessarily require an abort system, and the latter probably wouldn’t be helped by one, unless there was sufficient warning to activate it. So it will be interesting to know from telemetry how soon they knew the engine was going south.

History, Social Commentary, Technology and Society, War Commentary

China’s Aircraft Carrier

22 Comments

They’re about to find out just how hard it is to run one. It has this amazing statistic that I’d never seen before:

Between 1949, when the U.S. Navy began deploying jets on a large scale, and 1988, when the combined Navy/Marine Corps aircraft accident rate achieved U.S. Air Force levels, the Navy and Marine Corps lost almost 12,000 aircraft and more than 8,500 aircrew.

Emphasis mine. That’s accidents, not combat. And what they mean by getting the rate to Air Force levels, is reducing it to that rate. In other words, those are the casualties of learning how to fly combat-proficient aircraft from carriers, and it didn’t really occur until the introduction of the F/A-18 Hornet.

Here’s a related link: the U.S. Navy’s transition to jets.

And yet we obsess about safety in spaceflight.

[Via email from Jim Bennett]