Drag force allows for values greater than 1, which can cause the drag force to exceed the initial velocity, which will continue to compound until a NaN is reached or the particle's lifetime is up.

Steps to Reproduce
  1. Create an emitter and system based on the fountain template
  2. Change the drag in Drag Force to 100


Particles spew at high speeds in both directions. 


Particles would fall in the direction of gravity slowly

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ComponentUE - Rendering - Niagara
Affects Versions4.22
Target Fix0
Fix Commit6941747
CreatedJun 10, 2019
ResolvedJun 11, 2019
UpdatedJan 7, 2020