Description

Reproduced 3/3 times. A similar bug occurred with PhysX ([Link Removed])

Check the function: 

FVector FSimpleAerodynamicsSim::GetCombinedForces(float VelocityIn)

if the velocityIn is negative, the value should multiply -1. Then the vehicle will get correct aerodynamic resistance.  

Steps to Reproduce
  1. Create a new Vehicles template project
  2. Open SportsCar_Pawn
  3. In Components, click on Vehicles Movement Component
  4. In Details>Vehicle Setup, set drag coefficient to 300
  5. Compile & Save
  6. PIE in VehicleExampleMap (the default editor map for the template)
  7. Tap the S key to begin reversing

Actual Result: Car accelerates to mach speed, clipping through the bounds of the map

Expected Result: Car reverses slowly, as dictated by the high amount of drag. It should be similar to the Car's speed moving forward.

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Fixed
ComponentUE - Simulation - Physics
Affects Versions5.0.25.0.35.1
Target Fix5.2
Fix Commit23991344
Main Commit23992431
Release Commit23991344
CreatedAug 19, 2022
ResolvedFeb 3, 2023
UpdatedApr 28, 2023
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