Re: [Flightgear-devel] Abnormal surface friction factor

[James T. <ja...@fl...>]

> On 13 Jun 2023, at 08:20, Wayne Bragg <kil...@co...> wrote:
> 
> I finally had a chance to look at this a little closer. This unreasonably high rolling friction factor is only being calculated under the JSBSim FDM. Under YASim it is not dividing the material value by .02 and you end up with a reasonable value. Also why would you use static values directly from the material settings but not the rolling values?
> 

Erik replied (in this thread, but quite some messages ago) that the scaling by factor of 50 was intentional. Therefore I’m really unsure how to proceed: we can of course remove or change the value, but it affects all materials, so aren’t you simply moving the problem around?

Also, the scaling is done in groundreactions.cxx which is NOT JSBsim specific code, although maybe only JSBsim uses the particular API which does the scaling? (Just guessing how Yasim and JSBsim could be different in this regard)

Kind regards,
James