This update adds the following...
Added a Collision Damage multiplier in the "Game Settings" area so you can tweak damage levels to your own preferences.
Added Kopp–Etchells effect to all spinning blades. Thanks to Daimo for suggesting this as I had no idea this even existed. For those who also don't know it is an effect caused by the rotor blades striking dust/sand in the air when close to the ground that causes a sparkling effect. https://en.wikipedia.org/wiki/Kopp%E2%80%93Etchells_effect This effect needs to be manually turned on in the Video Settings. It is off be default as I think it would probably be confusing if you didn't know about it plus, as it is a particle effect, there is some overhead for it.
Fixed a couple of incorrectly assigned colliders on some of the helicopters so collision damage is now applied correctly
Removed colliders such as tail skids etc from the damage system as they were applying damage to the fuselage when landing.