Friction on non-standard runway surfaces
Hi everybody,
I am currently looking into literature on rolling and braking friction coefficients (mu braked and unbraked), and there's plenty of stuff available on the net for the usual runway surfaces like concrete, asphalt etc. in dry, wet, snowy etc. conditions. However, I could not find anything freely available dealing with surfaces like gravel, sand, grass and the like. Does anybody here have any info about where to find some aviation-related info in this area?
Thanks,
SF