L-Nav Speed to fly Indications

[Fred[_4_]]

I have an L-Nav connected to a Model 20 GPS and also a Winter
variometer. While at Marfa I had several oppotunities to fly some
long distances without having to thermal. What I noticed is that the
speed to fly commands are really off. The other variometers seem to
track each other and the averager and netto displays on the LNav seem
to jive. But, when flying straight, and flying through heavy sink,
the push to pull commands are showing me to slow down, just the
opposite of what is expected. The altitude needed to get home seems
to be correct, it was almost the same number as shown on the PDA with
GNII running.

Any ideas,
Fred

[lrbj]

On Apr 28, 1:21*am, Fred > wrote:
> I have an L-Nav connected to a Model 20 GPS and also a Winter
> variometer. *While at Marfa I had several oppotunities to fly some
> long distances without having to thermal. *What I noticed is that the
> speed to fly commands are really off. *The other variometers seem to
> track each other and the averager and netto displays on the LNav seem
> to jive. *But, when flying straight, and flying through heavy sink,
> the push to pull commands are showing me to slow down, just the
> opposite of what is expected. *The altitude needed to get home seems
> to be correct, it was almost the same number as shown on the PDA with
> GNII running.
>
> Any ideas,
> Fred

Hi,
Can it be the battery in your L-Nav? I had a similar experince last
year - replacing the internal battery fixed the problem.
Remember to note down all settings in your LNav configure & Calibrate
screen.
/Lars

[Paul Remde]

Hi Fred,

My best guess is that you have an incorrect number entered into the polar
settings or other settings in the L-NAV. Please mark down the settings and
e-mail them to me so I can see if they make sense.

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"lrbj" > wrote in message
...
On Apr 28, 1:21 am, Fred > wrote:
> I have an L-Nav connected to a Model 20 GPS and also a Winter
> variometer. While at Marfa I had several oppotunities to fly some
> long distances without having to thermal. What I noticed is that the
> speed to fly commands are really off. The other variometers seem to
> track each other and the averager and netto displays on the LNav seem
> to jive. But, when flying straight, and flying through heavy sink,
> the push to pull commands are showing me to slow down, just the
> opposite of what is expected. The altitude needed to get home seems
> to be correct, it was almost the same number as shown on the PDA with
> GNII running.
>
> Any ideas,
> Fred

Hi,
Can it be the battery in your L-Nav? I had a similar experince last
year - replacing the internal battery fixed the problem.
Remember to note down all settings in your LNav configure & Calibrate
screen.
/Lars