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Cadelanne Nov 5, 2016 @ 9:59pm
Force chute to deploy ?
Hey, while wandering on the internet my attention get caught by this particular screenshot :

https://steamcommunity.com/sharedfiles/filedetails/?id=434736292

As you can see, here drogue chute are deployed at very high altitude and speed, and they seem really useful. But I can't deploy my drogue chute like that. I can only deploy them when I'm at ~600 m/s, where I don't really need them anymore.

So how do you do as on the screenshot ? Or maybe it has be nerfed ? It's post release so this is the new athmospheric model here.
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Showing 1-15 of 19 comments
Hal Ramersby Nov 5, 2016 @ 10:08pm 
You have to play around with tweakables to adjust minimal pressure and altitude for the chute to open (contrary to popular belief it's not the case of Kerbals manually kicking the chute out through a hole drilled in fuselage, but a nifty adjustable automatic system) - actually you NEED to do that if you're planning a chute-assisted landing on celestial bodies with thin or thick atmosphere.
#1
Cadelanne Nov 5, 2016 @ 10:11pm 
Yeah and after some trying it didn't do much. Max deployable altitude is 10km, and anyway they don't deploy when pinned as "unsafe".
#2
Hal Ramersby Nov 5, 2016 @ 10:20pm 
Max deployable altitude governs the moment when they open up fully. Initial parachute activation is governed by pressure setting, you can see in your own screenshot they're not opened up fully
#3
Rhedd Nov 5, 2016 @ 11:13pm 
The only thing that'll happen if you manage to get a chute to deploy/semi-deploy when it's marked as "unsafe" is that your chute will get ripped off and never be seen again. Not particularly useful.

Hal is correct, though.
Last edited by Rhedd; Nov 5, 2016 @ 11:14pm
#4
Cadelanne Nov 5, 2016 @ 11:33pm 
Originally posted by Rhedd:
The only thing that'll happen if you manage to get a chute to deploy/semi-deploy when it's marked as "unsafe" is that your chute will get ripped off and never be seen again. Not particularly useful.

Hal is correct, though.

If so how does it happend that drogue chute are semi deployed and working at 1500+ m/s on the screenshot ?
#5
Rhedd Nov 6, 2016 @ 12:18am 
Originally posted by RIP Carriers forever in my heart:
Originally posted by Rhedd:
The only thing that'll happen if you manage to get a chute to deploy/semi-deploy when it's marked as "unsafe" is that your chute will get ripped off and never be seen again. Not particularly useful.

Hal is correct, though.

If so how does it happend that drogue chute are semi deployed and working at 1500+ m/s on the screenshot ?
All of those heatshields are keeping the chutes from burning up, and at that altitude the air pressure is so low the drag is probably safe, as well.

I wonder what'll happen next. Either the chutes will work well enough to keep the rocket at a safe speed, or (more likely, I think) they'll get ripped off the moment the ship enters thicker atmosphere.

I've noticed before that with drogue chutes (at least RealChute kevlar ones) there's a zone where it's safe to open them, then lower down and hotter there's an unsafe zone, and after that it's safe again. I've been thinking about testing drogue openings at extremely high altitudes to see what happens, but haven't gotten around to it yet.
#6
Pembroke Nov 6, 2016 @ 12:29am 
Originally posted by Rhedd:
I wonder what'll happen next. Either the chutes will work well enough to keep the rocket at a safe speed, or (more likely, I think) they'll get ripped off the moment the ship enters thicker atmosphere.

But maybe that's "by design" and acceptable? If they do slow you down before being destroyed I can see them being a feasible aerobraking aid with very high re-entry speeds or with very shallow angles.

No idea how effective, though.
#7
Rhedd Nov 6, 2016 @ 12:36am 
If there's not enough air to rip them off, there's not enough air to let them do much of anything. Probably lighter and better ways to slow the ship down by a tiny fraction. Like, for instance... toning down that huge umbrella of VERY heavy heatshields.
Last edited by Rhedd; Nov 6, 2016 @ 12:36am
#8
Cadelanne Nov 6, 2016 @ 12:45am 
Originally posted by Rhedd:
If there's not enough air to rip them off, there's not enough air to let them do much of anything. Probably lighter and better ways to slow the ship down by a tiny fraction. Like, for instance... toning down that huge umbrella of VERY heavy heatshields.

Well that's quite sad. I thought that drogue chute could save me a fair amount of fuel by allowing me to no-care about re-entry speed but meeeeeeh :(
#9
Rhedd Nov 6, 2016 @ 12:55am 
Originally posted by RIP Carriers forever in my heart:
Well that's quite sad. I thought that drogue chute could save me a fair amount of fuel by allowing me to no-care about re-entry speed but meeeeeeh :(
What are you trying to do? What're you using fuel for during reentry?
#10
Pembroke Nov 6, 2016 @ 1:30am 
Did some experimenting with drogue chutes. Even if you set them up as "deploy immediately" instead of the default "when safe" the problem is the minimum pressure setting. You can't set it lower than 0.02 and the Kerbin athmosphere reaches that only at the 20K height. So, couldn't make this work to test the idea...

Maybe the screen shot is using a mod?
#11
Cadelanne Nov 6, 2016 @ 5:11am 
Originally posted by Rhedd:
What are you trying to do? What're you using fuel for during reentry?

I'm not using them during reentry but in order to set a proper angle and / or reentry velocity to avoid a terrible death I have to save some deltaV. Deploying chute before this would allow me to get sharper angles and higher reentry speed.

Originally posted by Pembroke:
Did some experimenting with drogue chutes. Even if you set them up as "deploy immediately" instead of the default "when safe" the problem is the minimum pressure setting. You can't set it lower than 0.02 and the Kerbin athmosphere reaches that only at the 20K height. So, couldn't make this work to test the idea...

Maybe the screen shot is using a mod?

I don't think so. This was on a discussion about the utility of drogue chute and given the context I think that the author would have tell if he used a mod. However there's no way to be sure. Also, how do you set them up to "deploy immediatly" ? And by the way, when out of the VAB you can set chutes to 0.01 min pressure, I have no idea why you can't do it directly in VAB tho.
#12
Pembroke Nov 6, 2016 @ 5:29am 
In VAB right-click the chute. In addition to the sliders for the min pressure and max altitude there's a button that toggles between modes "when safe", "when risky", and "immediately".
#13
Cadelanne Nov 6, 2016 @ 7:48am 
Originally posted by Pembroke:
In VAB right-click the chute. In addition to the sliders for the min pressure and max altitude there's a button that toggles between modes "when safe", "when risky", and "immediately".

Well that's strange because I don't have such a button. Unless it's the small button in the top right corner of the box ?
#14
Rhedd Nov 6, 2016 @ 9:27am 
Originally posted by RoofCatA:
it may be part of Advanced tweakables.

Or just use aerobrakes. They are even lighter than chutes and don't need repacking.
They can't take much heat, though, so be careful.
#15
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Date Posted: Nov 5, 2016 @ 9:59pm
Posts: 19

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