On Tue, 07 Oct 2003 03:52:39 GMT, "Duane Eisenbeiss"
wrote:

"Jack Glendening" wrote in message
k.net...
Duane Eisenbeiss wrote:
Not quite sure what you meant by the above comment. The pitot for the
L-Nav
should always be connected to the same pitot port as the airspeed
indicator.

Right now the LNAV pitot and static info is taken from the TE probe
while the airspeed/altimeter values are taken from different probes. It
was my understanding that using a separate pilot+static for the LNAV was
better since the pitot and static measurments are then closer to the
free-stream values than those taken by the "normal" probes, which are
closer the fuselage.

Use whichever ports (pitot & static) suit you, however, it is best to have
both instruments connected to the same ports.

Duane


Actually the pitot/static from a dual or triple probe is probably the
best you are going to get on a glider. The Prandtl (combined
pitot/static) well forward of the LE of the fin and stab will have
small errors which you most likely won't have to correct in your
computer. This makes the computer easier to install and tune.

The ASI must be connected to the pitot/static sources specified in the
flight manual as all placarded limits are based in these. The ASI may
have quite large errors as a result as it helps the advertising
writers(stalls slow, runs real fast)


Mike Borgelt

Borgelt Instruments