Re: Prop mass and bsfc figures for YASim
Andy Ross <[email protected]>
| Newsgroups | gmane.games.flightgear.flightmodel |
|---|---|
| Message-ID | <[email protected]> |
Jim Wilson wrote: > I am assuming now you are suggesting that we should apply the weight > of the prop in kg to the above simplified formula to get a starting > number. Yes. Mass in kg, radius in meters. > What sort of effect would this setting have on YASim specificly? > Would this be limited to things like the speed at which RPM > increases/decreases? Should I worry about trying to find a better > number for the P-51D? It would also affect the gyroscopic inertia of the prop, which is what causes the nose to yaw slightly at high pitch rates (and pitch slightly at high yaw rates). A *very* high number would make the plane difficult to fly and the prop would take forever to get to change RPMs -- so much energy would be stored in it that it would spool more like a jet. But I'd expect the numbers would have to be way off to produce any real problems. The steady state flight characteristics don't care about this value at all. When in doubt, aim low, I'd guess. Andy _______________________________________________ Flightgear-flightmodel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-flightmodel 2f585eeea02e2c79d7b1d8c4963bae2d