SpaceX Launch Failure Due To Timing Problem

FleaPlus writes "Private orbital spaceflight company SpaceX recently announced that last weekend's Falcon 1 rocket launch failure was caused by a collision between the first and second stage of their rocket. This was due to a timing problem, when their brand-new engine design produced residual thrust for 1.5 seconds longer than expected; they're currently working to fix the problem and launch again, perhaps as early as next month. In a recent interview with Wired, SpaceX CEO Elon Musk remarked on their efforts: "Optimism, pessimism, f-ck that; we're going to make it happen. As God is my bloody witness, I'm hell-bent on making it work.""

Comments

Wow

[Anonymous Coward]

Optimism, pessimism, f-ck that; we're going to make it happen. As God is my bloody witness, I'm hell-bent on making it work

Now that sounds like a man who gets things done.

Re:Wow

[oliderid]

if you invest into spaceX Obviously:

• You are aware of the risk
• You don't expect any return on investment in a short/medium term...Or better you don't expect anykind of return at all.
• You know it will waste large sum of money.
• You are looking for fun.

What you need are fanatics investing all their energy in the project and leading the team. Like him. And then it could be a success IMHO. Cold blood/rationnal manager would have left this project already.

Re:did he really say that?

[th1nk]

I think it's the part in the wired article that goes like this:

Musk: Do I sound optimistic?

Wired.com: Yeah, you always do.

Musk: Optimism, pessimism, fuck that; we're going to make it happen. As God is my bloody witness, I'm hell-bent on making it work.

Re:Do they have payloads lined up to be blown up?

[dontPanik]

There was a DoD satellite and a NASA thingie on board when it failed.
Also there's plans to make deliveries to ISS once the shuttles are through.

Re:Timing? WTF?

[X0563511]

Bottom stage detached, continued burning. Less mass against the thrust, it accelerated and pushed on the top stage (but not perfectly centered as it would when still attached).

I'm sure they do communicate, but after detaching that's gone.

Basically the thruster(s) dieseled - continued running for a moment after fuel/whatever was cut.

Re:Timing? WTF?

[Anonymous Coward]

I AM a Rocket Scientist.

Traditionally, no, they wouldn't be timed individually. That's kind of a silly thing if you asked me.

Typically you should wait until the first stage stop accelerating the rocket before dropping it. A sensor typically detects that condition and initiates seperation. To be safe, it may wait a beat or two before taking action to make sure the booster isn't just "chuffing". Or the sensor could have just been faulty, initiating seperation too soon.

If the booster begins accelerating again (as in blows up) or gives a last burst of unexpected glory, that's just bad design or manufacturing issue. If it's a solid-fuel booster, that could happen from time to time, but if the motor is liquid fueled it should just cut off fuel and be done with it.

Now, you could put the stages on their own timers, but there are risks. Usually the problem is a failed booster, and the timer on the upper stage fires with the rocket pointing the wrong way.

Re:Hell-bent

[Rei]

The problem being that the sets 'folks who share that passion' and 'folks who have significant money to invest' have essentially zero overlap.

There's pretty much a whole class of dotcom-wealthy geeks in Silicon Valley who are a living contradiction to that statement. Let me tell you, for the most part, it's not movie stars who are plopping $100k down for Tesla Roadsters.

Investments as far out on the bell curve as SpaceX have always had a hard time finding capital.

SpaceX's third failure in a row just occurred and they just got a brand new influx of investment capital.

So close...

[ClayJar]

Actually, that's basically what happened. The Kestrel engine on the second stage ignited, and the exhaust from it pushed the first stage away. The problem is that the second stage is designed to have the exhaust expanding into the vacuum of space, and having the first stage right there meant that the exhaust was contained within (or perhaps I should say, was redirected by) the interstage. Normally, the first stage and second stage are pneumatically pushed apart just before the second stage fires.

The exhaust was only in contact with the second stage for a very short period of time, but that was sufficient to "roast" the second stage enough to cause failure, either due to direct thermal effects or the forces created by the expanding exhaust (or to a combination of those factors).

By the way, the nozzle of the Kestrel engine is radiatively cooled. Before the sloshing doomed flight two, it was cool (figuratively only!) to see the bell glowing brightly. Some people watching with me thought it was failing until I explained that it's supposed to look like that. ;)