Matthias Froelich wrote:
> This case kind of works for the arrester wires. The braking force is
> just hacked into the gear code. But this is just to be able to test.

What would probably be a better idea (at least for YASim) would be to
model the braking force as a *distance* over which the aircraft will
be stopped.  In the real world, they have to calibrate the wires for
the exact aircraft configuration that is going to be landing.

You would figure out what constant acceleration would stop the
aircraft in the distance available, and simply apply that force "at"
the tailhook and "towards" the center of the arrestor wire.

The catshot is actually harder: in real life, the force is at the
bottom of the nosegear.  But if you apply that to the dynamics model
the aircraft will want to tilt backwards as it accelerates.  Real
aircraft don't do this because the nosegear is artificially compressed
and held that way during the shot.  Maybe the easiest way to simulate
this would be to apply the force at the nose, or some other point
forward of the c.g. and above the gear.

I'm honestly looking for something to get me back into FlightGear
development.  I can do the YASim integration if you guys have an
interface ready for the "ground velocity" and "arrestor wire position"
values.

Andy

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