Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror
DEAL: For $25 - Add A Second Phone Number To Your Smartphone for life! Use promo code SLASHDOT25. Also, Slashdot's Facebook page has a chat bot now. Message it for stories and more. Check out the new SourceForge HTML5 Internet speed test! ×

Comment Re:I find your lack of faith disturbing... (Score 1) 389

That is basically the God fallacy that many engineers fall into. You think because you wrote it, that it has no bugs, and that it's fully understood?

I find it can be highly instructive to run a debugger even on working code, that is not cludge code.

I generally find it doing all kinds of crazy, inefficient things that I probably could not have predicted, even if I'm the one that actually designed and coded it!

Humans are very, very bad at writing robust systems; we never understand our software fully.

Comment Re:Well... (Score 1) 44

RP-1/HTP works fine. The British Black Knight had over 20 successful (suborbital) launches with it, and the later Black Arrow, whose first two stages were RP-1/HTP, put the UK's only independently-launched satellite into orbit, back in 1971.

Given the number of first-rocket attempts which have failed (sometimes explosively) because of things like frozen LOX valves, going non-cryogenic has a certain appeal. Especially since they can pretty much stockpile the things in a fueled state for rapid launch.

Any rocket fuel is likely to kill you if you look at them funny. Some more so than others, sure, but nobody is using liquid ozone or FLOX (liquid fluorine-oxygen) as an oxidizer any more either. (Or worse. See the book "Ignition!" for a fun look at early rocket fuel experiments.)

And for what it's worth, the mass ratio of an aluminum beer can (12 fl oz size) is a hair under 28:1. ;-)

Comment Re:Revolutionary Rocket aka aerospike engine (Score 3, Informative) 44

You're confusing aero spike engines with simpler (but heavier) spike engines.

In an aerospike, aerodynamic forces (often with the assist of gasses injected at the base of the engine) form the "pointy" part of the spike, so there's both the lighter and easier to cool aspect. Also known as a plug-nozzle, but the latter are usually (a) circular and (b) even shallower than this linear aerospike.

Spike nozzles (circular ones) have also been flight tested, but yeah, the tail of that spike is heavy -- and also not what you want if you're planning to reuse the vehicle, because it aggravates reentry heating. (Doesn't look like this is what ARCA is planning though, I guess they're just going for cheap and disposable. Maybe reusable will follow.)

NASA never had any problems with their X-33 aerospike, it was all down to the weird-ass V-shape fuel tank configuration.

Comment Re:It's sooo easy! (Score 1) 126

Didn't matter a lot. Maybe it was a honeypot, maybe it checked a whole bunch of sites in a man in the middle attack- but I DIDN'T type in my username, so they would have had to check all the lists of millions of entries and do it very quickly, so I don't think so. And it listed out which breach it was, and it matched up. And I think it used a rainbow table for checking it, so they (allegedly) weren't sending my password in the clear.

It makes little difference, I didn't give a shit about any of the accounts, and I changed them all using LastPass to random 16 mixed character passwords.

Comment Re:3 articles referencing the same statement, misu (Score 1) 126

> You have to always assume your pc has been hacked.

LOL. You can't polish a turd. If your PC is hacked they can grab your password as you type it in anyway, so using an online password storage makes no material difference to security as opposed to using your brain, but the online security is much more convenient, and the online stored passwords are much longer and more random, whereas you've admitted that your passwords are total shit.

Slashdot Top Deals

The number of computer scientists in a room is inversely proportional to the number of bugs in their code.

Working...