On Mon, 10 Dec 2001, Andy Ross wrote:
> David Megginson wrote:
> > According to the YASim config file, it has the pilot and a passenger
> > at 180lb each, and something labelled "cockpit" (baggage?) at 200lb.
> > Both fuel tanks are full.
>
> The "cockpit" ballast that you see is intended to represent the panel,
> control column, instruments, seats, etc... Basically, everything that
> isn't part of the airframe. The tail of the plane is a hollow tube,
> but the front has stuff in it. If you leave the mass distribution
> as-is, YASim will weight all sections of the fuselage equally and
> you'll have a tail-heavy plane that flips backwards on its gear. :)
>
> Is it really 200 pounds? Dunno. I just fiddled with it until the
> c.g. behavior looked right, as measured by "does the plane sit nicely
> on its gear"? The mass distribution computation needs some tuning;
> other things that are currently wrongish:
>
It would be interesting to see if a "virtual" balance jig could be
made. It would allow builders to set the "default" CG based on the book.
g.
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