The Aziz Posted September 29, 2023 Share Posted September 29, 2023 (edited) Reported Version: v0.1.4.1 (latest) | Mods: none | Can replicate without mods? Yes OS: Win10 | CPU: RTX2060 | GPU: i7-10700K | RAM: 32GB Tried with stabilizers, without them, with SAS module and without. Flies like with a side wind. Steps to reproduce: 1. Launch the attached vessel. 2. Hit the prograde alignment SAS mode. 3. Observe it flip multiple times after some time. This shouldn't have happened with no sideways forces. I just can't keep it straight and it should be a piece of cake with rocket this simple. Included Attachments: Desktop2023_09.29-21_10_55_03_DVR.mp4 why.json Edited September 29, 2023 by Anth12 Link to comment Share on other sites More sharing options...
squibonacid Posted September 30, 2023 Share Posted September 30, 2023 This seems like normal behaviour to me. As you get fast and faster while still in thick atmosphere, the drag applied to the top of the rocket increases. I'm not sure if barrier of sound is implemented in KSP2, but that would also suddenly increase drag upon reaching it. Additionaly, maybe the emptying tanks also have an effect in this (change of center of mass)? Link to comment Share on other sites More sharing options...
Mushylog Posted September 30, 2023 Share Posted September 30, 2023 Hi. It looks like you are using the "Reliant" engine, which has NO gimbal, unlike the "Swivel". Plus your craft does not have wings or any other way to steer. This will result in a total loss of control over your craft, at high speed, in thick atmosphere (in the blue-est part of the atmosphere-meter). Try with wings + control surfaces on them, and also try with the engine named "Swivel". 4 minutes ago, Mushylog said: Hi. It looks like you are using the "Reliant" engine, which has NO gimbal, unlike the "Swivel". Plus your craft does not have wings or any other way to steer. This will result in a total loss of control over your craft, at high speed, in thick atmosphere (in the blue-est part of the atmosphere-meter). Try with wings + control surfaces on them, and also try with the engine named "Swivel". Alright, I tried to replicate the craft in question based on the video and it flew just fine, it reached space with no loss of control, with: the "Reliant" engine, the 4 little wings with no control surface, the FL-T800 tank, a TD-12 decoupler, a "Terrier" engine, an FL-T200 tank, SRW-125 reaction wheel, a "Cockleshell" fairing, an OKTO control probe, and a Z-200 battery. I don't know why you experienced loss of control, it looks like it's related to atmospheric pressure on your vessel, but... it should fly just well. Link to comment Share on other sites More sharing options...
The Aziz Posted September 30, 2023 Author Share Posted September 30, 2023 45 minutes ago, Mushylog said: Hi. It looks like you are using the "Reliant" engine, which has NO gimbal, unlike the "Swivel". Plus your craft does not have wings or any other way to steer. This will result in a total loss of control over your craft, at high speed, in thick atmosphere (in the blue-est part of the atmosphere-meter). Try with wings + control surfaces on them, and also try with the engine named "Swivel". Alright, I tried to replicate the craft in question based on the video and it flew just fine, it reached space with no loss of control, with: the "Reliant" engine, the 4 little wings with no control surface, the FL-T800 tank, a TD-12 decoupler, a "Terrier" engine, an FL-T200 tank, SRW-125 reaction wheel, a "Cockleshell" fairing, an OKTO control probe, and a Z-200 battery. I don't know why you experienced loss of control, it looks like it's related to atmospheric pressure on your vessel, but... it should fly just well. You can download my rocket, it's right there in the report. Tried with Swivel, Reliant, with SAS, without (though operating only on probe core reaction wheel made it even harder), with stabilizers and without them.. and the payload is ultra light. 1 hour ago, squibonacid said: This seems like normal behaviour to me. As you get fast and faster while still in thick atmosphere, the drag applied to the top of the rocket increases. I'm not sure if barrier of sound is implemented in KSP2, but that would also suddenly increase drag upon reaching it. Additionaly, maybe the emptying tanks also have an effect in this (change of center of mass)? That never occured to me in KSP1 as long as I kept the rocket pointing prograde. Yes the drag hit the maximum but it almost never flipped my rocket. Here it feels like hitting a wall, which is odd considering the rocket is aerodynamic. Link to comment Share on other sites More sharing options...
Tdodge58 Posted September 30, 2023 Share Posted September 30, 2023 Im having the same problem even in a vacuum. With SAS on prograde it just starts flipping with no engine input and its using EC. Makes the game pretty much unplayable. I just tried it without SAS and it does the same thing just a lot slower, Still unplayable. Link to comment Share on other sites More sharing options...
Vortygont Posted September 30, 2023 Share Posted September 30, 2023 23 hours ago, The Aziz said: This shouldn't have happened with no sideways forces. I just can't keep it straight and it should be a piece of cake with rocket this simple. Looks strange. I have assumption that problem is in fairing. Maybe fairing occludes details under it incorrect and this causes drag and instability, I don't know. Try to use nosecone instead of fairing and see what will happen Link to comment Share on other sites More sharing options...
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