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AndyMt / GravityTurn

KSP Plugin to automate highly efficient launches
GNU General Public License v3.0
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[Mod Interaction] Gravityturn displays absurdly high drag values on rockets with payload fairings with FAR installed #40

Open Zuthal opened 7 years ago

Zuthal commented 7 years ago

The following mods were installed: The latest dev release of FAR, the latest version of GravityTurn Continued, the latest version of ModuleManager and the latest version of ModularFlightIntegrator.

Issue description: When launching a rocket with a payload fairing, the air drag reported by GravityTurn reaches absurdly high values (e.g. >30 m/s^2 on a rocket with a TWR<3, while still accelerating). This influences the mod's launch profile optimisation, as it uses the air drag integrated over the flight time, along with vector and gravity losses, to optimise the launch profile.

Steps to replicate: Build a rocket with a generally aerodynamic shape and a payload fairing at the top. Have GravityTurn launch it with the stats window open, and observe the air drag number.

Images: http://imgur.com/a/FjrjH

EDIT: According to ferram, this issue is on GravityTurn's end. He said that "In order to fix this, GravityTurn would need to reach into FAR's drag numbers through the FARAPI class and make use of that.". Also, it appears this issue does not appear with all fairings - e.g. a rocket with the 2.5 m fairing shows more or less sensible drag numbers.

AndyMt commented 7 years ago

Sorry, for the moment I have no plans (=I have no time for mod development) to support FAR for GT. This may change in a few weeks or months, but I can't promise anything. Adapting to 1.3 is top priority now.