At 16:49 26 May 2014, wrote:

I have a 302, a CN vario, and a V9 installed here and there so
can compare
=
these. I'm also very fussy about varios, as the CN people will
attest.=20

The 302 is a very very good vario. But it's not in production
and it's not
=
as robust as the new ones. It has to be set up right and
properly
compensat=
ed.=20

Like all these varios it does not like leaks, it does not like
flow varios
=
on the same circuit, and it wants the pressures all coming
from the same
pl=
ace, not the probe. If you have leaks, flow varios connected
together, or
y=
ou're not using pitot, static, and TE from the probe all these
varios will
=
disappoint.=20

The CN vario is also very very good. The first generation of
the filtering
=
software was, in my opinion, a bit better than 302. The
second generation
(=
last summer) removed a lot of bugs, but was a step backward
in filtering,
e=
specially in strong weather and full of water. Now that the
navigation
stuf=
f is behind them, I gather CN is working again on filtering.
Frequent
softw=
are updates and active development is a plus.=20

The V9 is a great vario out of the box. The filtering is
excellent. It too
=
needs to be set up right and correctly compensated.=20

It has one big downside for me so far. Where the CN and 302
vario are set
u=
p that "2 knots up" means "2 knots up" in both speed
command and climb
mode=
, the V9 tones in speed command are set to correspond to
horizontal speed
d=
ifferences not vertical ones. It uses somehting like the same
tone for "10
=
knots fast" that it does for "2 knots up." But in a modern
glider, the
spee=
d to fly is much more sensitive to the lift value. So, bottom
line, the
ton=
es swing around in speed command mode much more than
they do in climb
mode.=
Where this is a problem is when you slow down and sniff
around but
haven't=
decided to climb. In speed mode, you'll hear garbage, much
too optimistic
=
in lift. So, you have to set it up to switch to climb mode at
about 70
knot=
s. =20

All of these varios have hardware in them that could allow for
amazing
thin=
gs, not yet implemented in software.=20

John Cochrane

John,

I don't have a problem with the V9 audio but had to think about
the options as there are 7 climb and 5 cruise audio tone options
to choose between so it should be possible to choose a
combination that gives good information and differentiation
between climb and cruise. I have the V9 needle set for Relative
in cruise mode and so I have selected the "SC Mixed" cruise
audio mode. To quote the manual, "for positive relative values
the sound represents relative; for negative relative values the
sound represents SC". This makes reasonable sense to me
intuitively in flight although I prefer the Borgelt idea of
changing to climb tone when the relative is higher than the MC
setting


John Galloway