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ferram4 / Ferram-Aerospace-Research

Aerodynamics model for Kerbal Space Program
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Weird drag behaviour #208

Closed lilbat closed 7 years ago

lilbat commented 7 years ago

I was watching aero forces troughout my re-entry and i've noticed that some parts were not producing drag (at about 2000 m/s) especially my front part and when i landed some parts were producing a lot of drag but i wasn't moving. 20170628162052_1

So is it just a visual bug or is it a real issue?

ferram4 commented 7 years ago

I need reproduction steps. I have no idea what is going on if you don't tell me what you've done. I also need to know what KSP version you're on and what other mods you're using. You've given me basically nothing to work with here.

lilbat commented 7 years ago

For the reproductions steps i've just flew this SSTO into orbit (no docking or something else i just stayed at about 100 km of kerbin) then i landed at the KSC and while i was on my way back to the KSC i've activated the option to see the aero forces in flight ( with alt + f12 then physics and tick the right case in aero). I didn't do anything special actually. And for my planes it's build B9 and stock parts no tweakscale was used.

I'm playing with KSP 1.3and here are my mods installed: FAR B9 aerospace B9 aerospace HX B9 aerospace legacy B9 animation modules B9 part switch Community category kit Firespitter (but i've deleted all the parts in the part folder) JSI KAS KIS Infernal robotics (only the with the rework model and also i've deleted the "rework_Utility folder in parts otherwise my game crash when i launch the game ) Modular Flight Integrator Quick Exit Smoke Screen Trajectories TweakScale

ferram4 commented 7 years ago

Which FAR build are you using? Clearly a dev build if it's loading in 1.3, but the dev build from which commit?

Are ALL of these mods needed? If not, which ones aren't needed? And I mean "needed" not, "I don't want to check" because more mods makes the likelihood of reproducing the issue a lot less likely.

Does it happen with just this SSTO, or any vehicle? Can it be caused with a simpler vehicle? Does it even need to be flown into space?

lilbat commented 7 years ago

About the commit : i don't know how to find older commits but this issue happens even with the latest commit.

All the mods aren't needed to make this bug. If i uninstall trajectories it doesn't occur(so only trajectories makes this bug occur with FAR). Also the messed up drag occurs only with parts like wings, control surfaces (when i said that some parts had too little drag it's just because i'm dumb,i think it was working properlly for these parts).

It happens with all vehicules regardless if i go to space or not.

ferram4 commented 7 years ago

It looks like these aren't forces at all, this is Trajectories' predictions clobbering the aero arrows. I've added a check to prevent it from doing that, unless it's doing stuff that it should not be doing to try and get info from FAR.

Fix is in the latest dev build.