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Isar Aerospace launches Spectrum, fails early in first stage flight

nasaspaceflight.com

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Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#31

Launch video with timestamp, https://youtu.be/bykfQ3J4NNc?t=2049 edit: And different camera angles here, https://www.youtube.com/watch?v=LlAgenP2RxM https://tv.vg.no/nyheter/se-den-historiske-rakettoppskytning...

Why does the first video just cut to nothing for the most exciting part, the fall?

It was a live stream, presumably stream operators had instructions to not show the kaboom live on camera, should one occur.

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#32
post #30

Earlier quoted context omitted.

Looks like it was completely successful. They willingly terminated the launch after achieving mission goals.

"Completely successful" would've been reaching orbit. They didn't expect to get that far, but this was still a far cry from a complete success. Only milestones cleared are countdown, launch, and stable flight in fixed attitude - which still leaves a lot of big ones on the way to orbit (controlled pitchover, max-Q, stage sep, second stage ignition and operation, payload fairing separation, orbital insertion, payload s…

That would be “wildly beyond expectations”. If some project achieves 100% of the goals, that is complete success by definition. They did it.

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#33
post #12
post #9

Earlier quoted context omitted.

By just looking at the video, you can see that they cut the engines after the rocket starts tilting. I guess that’s the flight termination system. Also, it didn't fall into the ground, but into the water.

> Also, it didn't fall into the ground, but into the water. Ah yes very important distinction this

I cannot tell if you're joking or not, but a rocket crashing into water vs on land is easily the difference between "no big deal" and "property damage + loss of life."

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#34
post #3

The first orbital launch attempt from continental Europe, and the first of Europe’s batch of newspace commercial launch startups. I hope they figure out what happened and iterate quickly!

I think that should be "first commercial orbital launch attempt from continental Europe". Commercial is required to exclude launches from the Plesetsk Cosmodrome, orbital is required to exclude the Miura 1 attempt, Europe is required for obvious reasons & continental is required to exclude the LauncherOne attempt, and attempt is required for obvious reasons.

If you want to get technical, Andoya is an island separated from continental Europe...

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#35
post #6

> CEO and Co-founder Daniel Metzler: “Our first test flight met all our expectations, achieving a great success. We had a clean liftoff, 30 seconds of flight and even got to validate our Flight Termination System. With this result, we feel confident to approach our second flight.” See: https://isaraerospace.com/newsroom-first-test-flight

Does the flight termination system consist of the rocket free-falling into the ground resulting in a fiery explosion?

I've read a lot about this from at least the United States perspective. The rocket wasn't launched from the United States, but the FAA requirements on flight termination is the ceasing of thrust and removing "energy" from the vehicle by rupturing tanks if they pose a danger. The primary thing that's trying to be prevented by flight termination systems is damage/danger to uninvolved parties. So if it's low to the ground simply shutting off the engines is a perfectly fine solution to the issue. If its higher then rupturing the tanks will be needed as it's likely going to land outside the safety area.

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#36

Is this rocket „dual use“?

If your enemy is your employer and their launchpad infrastructure—yes! Less jokingly: liquid-fueled rockets aren't very practical weapons, especially ones with cryogenic fuels like liquid oxygen. I highly recommend Clark's Ignition! An Informal History of Liquid Rocket Propellants for a history of the space and missile races, as understood from the point-of-view of a propellant chemist who worked in them. There's an…

To be specific, the challenge with cryogenic fuels is that you can't really keep the rocket fueled up all the time, so you need to spend a bunch of time fueling up the rocket, reducing the responsiveness of the system.

There were generations of hypergolic liquid fueled ICBMs. Those are typically pretty reasonably responsive (and reliable). Unfortunately the fuel is toxic as hell.

Europe does have native solid booster capability. The Vega-C has solid rocket motors for the first 3 stages for example. Very crudely looking at sizes, the 2nd and 3rd stages of a Vega-C should more or less approximate a typical ICBM.

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#38
post #6

> CEO and Co-founder Daniel Metzler: “Our first test flight met all our expectations, achieving a great success. We had a clean liftoff, 30 seconds of flight and even got to validate our Flight Termination System. With this result, we feel confident to approach our second flight.” See: https://isaraerospace.com/newsroom-first-test-flight

Certainly a glass half full way of looking at it.

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#39

Earlier quoted context omitted.

Looks like it was completely successful. They willingly terminated the launch after achieving mission goals.

Tilting the rocket didn't work as intended though, so something did go seriously wrong.

The rocket started oscillating before. I believe it was pure coincidence that the launch termination system kicked in when they started the pitchover manoeuvre.

Re: Isar Aerospace launches Spectrum, fails early in first stage flight

#40
post #3

The first orbital launch attempt from continental Europe, and the first of Europe’s batch of newspace commercial launch startups. I hope they figure out what happened and iterate quickly!

Also the biggest German rocket since V2.
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