Re: YASim prop discing and turboprop engine

Quoting Oleksiy Frolov <[email protected]>:

> I was first intended to use YASim due to the fact that we don´t have the
> airdynamical coefficients from the manufacturer, and YASim allowes
> building a model based upon the geometry instead.
> 
> However, availability of the scripting in JSBSim looks like an important
> point too.
> 
> 
> > As Jon mentioned below, perhaps
> > the
> > new Markup Language would enable setting two independent flap-like
> > surfaces
> > which have a virtual deflection dependent on individual Prop Thrust.
> 
> John, would markup language of JSBSim support the direct increase of the
> lift, or at least the mentioned above differential flaps extention as a
> workaround ?
> 
> We do have the flight data recordings form the airplane we are going to
> simulate. From experience, is it generally possible to guess the
> airdynamical coefficients from the flight data recordings ?
> 
> Thanks a lot !
> 
> Regards,
> Oleksiy


It is possible to deduce many of the aerodynamic coefficientes from flight test 
data, if you have enough data. I might also recommend that you look into 
DATCOM+, which will give you a real good start in building the aero 
coefficients. You can find it at www.holycows.net/datcom

Bill





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