Erik Hofman writes:
> We have three FDM's of which two of them use windtunnel/flight-test > data and one is based on physical dimensions of the aircraft. The > latter is a bit less accurate but is easier to design a working > aircraft for.
To be fair, YASim is not necessarily less accurate, though it does use a solver to fill in many of the blanks.
In fact, YASim is currently the only FDM that performs calculations for each lifting surface separately -- YASim figures out the angle of attack, lift, and drag for each surface then calculates moments from the differential lift and drag, while JSBSim uses a single angle of attack for the entire aircraft and simulates the differences in lift and drag using a long series of moment coefficients. Both are fine in
Yeah, but the windtunnel or flight-test data woudl include the individual coefficients in one single value. This means that if there is data for -180 ... +180 degree AOA and Yaw JSBSim (and UIUC) woudl be more accurate compared to YASim.
That said, YASim is realy a good alternative for most situations.
Erik
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