Coaster Blast posted on July 1st, 2019
Hi ! I don't really understand the friction coefficient box in the Properties, what does it do, and should we change it from one coaster type to another ?
As far as I can tell, it is the same as the 'Air Resistance Parameter' from NL2, as it says in the changelog for FVD 0.75: "NL2 style friction parameters".
The units don't seem to be updated from the original FVD++ friction parameter however. The tooltip on NL2 says it is the speed^2 friction simulation parameter with units 1/m. I assume this means the effect of the air resistance is proportional to the velocity squared. ie:
a = -β*(v^2)
Where a: acceleration (m/s/s), β: coefficient (1/m), v: velocity (m/s)
The units work out with this formula, so I assume this constant takes into account the mass and shape of the ride vehicle alongside other complex dependencies. I'll have to do a bit more playing around to see if this coefficient changes based on coaster type, amount of cars, etc. but it seems to be that the NL2 value for this is approximately 10.0E-05, rather than the FVD default of 2.0E-5.
I should also say the effect of this parameter is effectively negligible when compared with the main (m/m) friction parameter, the effect is so small it almost makes no difference. I'm talking maybe 1km/h throughout a 1km layout. If anyone else knows anything more than me or that I'm wrong on something feel free to let me know.