Bugs: Difference between revisions

Bugs (view source)

Revision as of 09:58, 13 May 2007

1,567 bytes removed , 13 May 2007

→‎Wild accelerations at low speeds.: Moved to fixed bugs.

AndersG

789

edits

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 localizers have DME).
-==== Wild accelerations at low speeds. ====
-Improper inclinometer ball indications have been observed:
- -- When parked, the ball was pegged to one side.
- -- When taxiing at low speeds (a few knots or less) the ball
-  oscillated wildly back and forth.
-This was observed in the c182 model and in the default c172 model.
-Tracing indicates that the problem is not within the slip_skid_ball.cxx
-code, but rather upstream of there, in the flight dynamics.  Tracing
-shows that the y-accel-fps_sec values are wildly fluctuating in
-direction, and enormous in magnitude.
-Additional evidence pointing to the FDM comes from the fact that
-the problem is observed with JSBSim and not with larcsim (although
-larcsim has other problems, such as drifting slowly sideways while
-parked).
-This is important from a procedures training point of view.
-If you want to have a realistic flight, one of the checklist items is to verify, insofar as possible, that the instruments give correct indications during preflight and taxi.  In a real aircraft, a pilot who found the
-inclinometer pegged would cancel the flight before even starting
-the engine.
-Note: This has probably been resolved in the latest release of JSBSim that is now incorporated into FlightGear. It may have stemmed from bad ground reactions modeling. Standalone tests with JSBSim and the C-172 sitting on the runway show the following properties steadily holding at zero:
-*velocities/vdot-fps
-*velocities/a-pilot-y-ft sec2
-*velocities/n-pilot-y-norm
-This item needs to be revisited to see if it has been cleared up.
 ==== Airport lighting in poor weather. ====

Bugs: Difference between revisions

Bugs (view source)

Revision as of 09:58, 13 May 2007

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