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NASA pack SRB's thrust is unblockable

KN_Namida
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KN_Namida

KN_Namida

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Don't worry, it's impossible.

I talked briefly about this issue some time ago, addressing it as "new SRBs won't overheat" well of course they won't, their nozzles can't be blocked!

I haven't tried with every single part of the stock catalog, but it didn't work with other SRBs, nor fuel tanks nor rocket motors...

Just try this. Get yourself one of those long SRBs, the ones from the NASA pack. Place something underneath it, just under the exit nozzle. then launch the thing. The nozzle won't be blocked, and it will generate both lift force and flame FX. If what you placed is light enough, the SRB will take it to the skies until it burns out.

Just to clarify, it can be overheated. But it can't overheat something placed under it, because the nozzle can't be blocked. Just give it a try.

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Claw

Claw

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Also, maybe you should change the tag of this from [support] to [bug].

The [bug] tag has been changed to a moderator selection only due to misunderstanding of it's intended purpose. This is indeed looking like it might be a bug, but I think further investigation will make that clearer. Using this post usually speeds up the process. http://forum.kerbalspaceprogram.com/threads/92230-Stock-Support-Bug-Reporting-Guide?p=1380978&viewfull=1#post1380978

Cheers,

~Claw

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vexx32

vexx32

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Last two things -- a log file, and... 100% stock, aye?

Wait, you said it didn't work? OP said they could still be overheated, but thrust could not be blocked... which is basically what you demonstrated. And yeah, thrust really rather should be completely blocked in that kind of situation.

That looks perfectly comical. Very Kerbal -- route the thrust through an entire fuel tank​. :D

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KN_Namida

KN_Namida

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Mhm thanks for the positive responses guys, Even Vexx32, Claw and Kasuha replied, I feel honored :D

My mistake giving this thread the "support" prefix instead of the "bug" prefix. Thanks for correcting that, very appreciated.

That little bit of overheating you see in the pics posted by Kasuha and ToTheMun is just the normal amount of overheating any SRB suffers while inside the atmosphere. When I said that these long thrusters could be overheated, I meant that they could be blown apart by placing another engine on top of them. Explosive decoupling, practically. That still works, if the engine above is NOT another one of these long SRBs.

The core of the issue is this: when you activate a long SRB, the nozzle cannot be blocked by anything, so this thruster will always be able to generate thrust, no matter what. And since the nozzle can't be blocked, the part you placed under the SRB won't overheat, the flames will just pass through it, and thrust will be generated.

Yes I work in a 100% stock install, for the ones who asked. I hope this bug gets fixed sooner or later. Thanks again for the positive feedback :)

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vexx32

vexx32

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Ah, worry, not. [support] is a general tag for everything, which is one of only two available (the other being [solved]) for regular members. People routinely misused the other tags, so we hid them from you and it's now up to us moderators to determine if something is actually a bug or there's something else going on, etc., before it is awarded the [bug] tag.

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Padishar

Padishar

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Okay I spent a bit more time on it and it's just slight misalignment of the flame and the SRB nozzle. The obstacle evaluation starts slightly below the nozzle and if you place a part into that gap, it is ignored. If you place it just a bit further, there's no thrust.

Yes, it is just because the thrust transform of the engine starts below the attach node:

AX6EDJa.jpg

Due to the way the thrust blocking is implemented (a raycast using the thrust transform as the origin and direction), thrust can get out of parts fine but can't get into them.

I would say this is definitely a bug and it would be worthwhile checking all of the engines for similar issues and tweaking all the dodgy thrust transforms so they are slightly "above" any bottom node on the engine...

Edited by Padishar
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KN_Namida

KN_Namida

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Uh so the cause of the issue has already been found, great!

I hope Squad fixes it sooner or later. Also, it's the only engine that gave me this kind of problem, that I remember of... But I never tried explosive decoupling with liquid fuel engines, so I don't know if some of them suffer from this misalignment...

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Kasuha

Kasuha

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I would say this is definitely a bug and it would be worthwhile checking all of the engines for similar issues and tweaking all the dodgy thrust transforms so they are slightly "above" any bottom node on the engine...

I checked the thrust vector for all engines and found one more suspect:

KHj2GeB.jpg

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Starwaster

Starwaster

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That looks perfectly comical. Very Kerbal -- route the thrust through an entire fuel tank​. :D

I concur; this is clearly working as intended! I never much liked putting fuel tanks on top of rocket engines. This will revolutionize the industry. Revolution I tell you!

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KN_Namida

KN_Namida

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Unfortunately...

io8rUiJ.png

I placed a fuel tank from the NASA pack under the engine. Which you can't see because it's covered by that huge fairing. I placed a stayputnik on top of the whole thing, and pressed spacebar. Lifted off just fine.

Squad, please, fix these 2 engines... when you got the time.

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  • 4 weeks later...
  • 2 weeks later...
KN_Namida

KN_Namida

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Yup, bug squished, I can confirm that :D sorry for being late to the party, I had to reinstall KSP and started playing just today :P

Thanks Squad! We can change the thread tag to "solved" now.

Edited by KN_Namida
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