re: [Flightgear-devel] JSBSim Airport Bug

[David M. <da...@me...>]

Tony Peden writes:

 > There appears to be (at least) two problems here.
 > 
 > First, the altitude for KSJC is 17 meters ( ~56 ft) yet when I start with 
 > --airport-id=KSJC, 3.28 meters is passed to *both* jsbsim and larcsim.

That number looks strangely familiar: 1 meter =~ 3.28 feet.  I cannot
guess why you're getting 3.28 *meters*, but this seems to be a default
altitude of 0 + the adjustment main.cxx makes for pilot elevation.

Don't the FDMs work with feet rather than meters.

 > The second issue is that larcsim doesn't crash because there's an
 > altitude check and adjustment in main.cxx that is executed.
 > LaRCsim accepts the adjustment, JSBSim doesn't (for whatever
 > reason, I haven't gotten that far into it yet).

Perhaps it results in an enormous force acting on the gear code.  I'm
seeing the bug at low-elevation airports as well now, but originally,
it appeared only at higher-elevation airports (possibly because the
calculated force was higher).


All the best,


David

-- 
David Megginson
da...@me...