TE vario

[G.A. Seguin]

Hi,
I am looking for a vario which take TE from pitot and static pressure,
like the Westerboer, to go with my LX 5000 which has electronic TE.
Gilles

[Kevin Christner]

I'm a little bit confused. If you are using pitot and static in a
vario then you need electronic compentation. If you use reverse-pitot
(total energy probe) you need no compensation. I think you are
talking about wanted a vario that uses a total energy probe.

In fact, the LX5000 will use the total energy probe. You just need
set compensation to zero. If you want another vario to go along with
the LX5000, consider B40 if you want an electronic vario, or a Sage
or Winter if you want a mechanical one. The nice part about the B40
is you dont need a capacity bottle.

Kevin

On 2 Jun 2004 09:04:15 -0700, (G.A. Seguin)
wrote:

>Hi,
>I am looking for a vario which take TE from pitot and static pressure,
>like the Westerboer, to go with my LX 5000 which has electronic TE.
>Gilles

[Andy Durbin]

(G.A. Seguin) wrote in message >...
> Hi,
> I am looking for a vario which take TE from pitot and static pressure,
> like the Westerboer, to go with my LX 5000 which has electronic TE.
> Gilles


The Cambridge 302 meets your requirement but probably costs more than
most would spend on a backup instrument. I do know one pilot though
that has 2 302 in the panel.

Andy

[Bert Willing]

As far as I recall, the Bohli varios use this compensation principle, and
they have quite a good reputation.

--
Bert Willing

ASW20 "TW"


"Todd Pattist" > a écrit dans le message de
...
> Kevin Christner > wrote:
>
> >I'm a little bit confused. If you are using pitot and static in a
> >vario then you need electronic compentation. If you use reverse-pitot
> >(total energy probe) you need no compensation. I think you are
> >talking about wanted a vario that uses a total energy probe.
>
> No, there are older TE designs using a diaphragm between the
> pitot and capacity at static pressure. As you slow, the
> diaphragm flexes less and the volume of the capacity
> increases. It's designed to flex just enough to compensate
> for the expansion of the air due to your stick thermal so no
> air flows out the vario due to your climb even though you
> have no TE tube, and your vario is hooked to static.
>
> They never had a great reputation, and I'm not aware of any
> varios that had this feature built in, but it could have
> been. I suspect any diaphragm compensators still around
> will need some tender loving care to resurrect to usefulness
> as the diaphragms were kind of finicky and aged quickly.
>
>
> Todd Pattist - "WH" Ventus C
> (Remove DONTSPAMME from address to email reply.)

[tango4]

Todd

The Bohli is a very sensitive total energy taught band variometer. Todays
replacement value is around 2100 Euro ( see
http://www.bohli-magnete.ch/pdf/4ins-ve.pdf ) I suspect that you have it
connected incorrectly! Anyone out there have a manual for the Bohli vario
for Todd?

Ian


"Todd Pattist" > wrote in message
...
> "Bert Willing"
> > wrote:
>
> >As far as I recall, the Bohli varios use this compensation principle, and
> >they have quite a good reputation.
>
> I have a Bohli vario and mine shows no sign of using such
> compensation. It came attached to my TE, where it worked
> well, but it interfered with my internal capacity Ilec and I
> took it off the TE and put it on the static where it's
> subject to stick thermals, but serves as a backup.
> Todd Pattist - "WH" Ventus C
> (Remove DONTSPAMME from address to email reply.)

[tango4]

Oops sorry thats 2100 swiss francs I think but that's still US$ 1600

Ian


"tango4" > wrote in message
...
> Todd
>
> The Bohli is a very sensitive total energy taught band variometer. Todays
> replacement value is around 2100 Euro ( see
> http://www.bohli-magnete.ch/pdf/4ins-ve.pdf ) I suspect that you have it
> connected incorrectly! Anyone out there have a manual for the Bohli vario
> for Todd?
>
> Ian
>
>
> "Todd Pattist" > wrote in message
> ...
> > "Bert Willing"
> > > wrote:
> >
> > >As far as I recall, the Bohli varios use this compensation principle,
and
> > >they have quite a good reputation.
> >
> > I have a Bohli vario and mine shows no sign of using such
> > compensation. It came attached to my TE, where it worked
> > well, but it interfered with my internal capacity Ilec and I
> > took it off the TE and put it on the static where it's
> > subject to stick thermals, but serves as a backup.
> > Todd Pattist - "WH" Ventus C
> > (Remove DONTSPAMME from address to email reply.)
>
>

[Kirk Stant]

(G.A. Seguin) wrote in message >...
> Hi,
> I am looking for a vario which take TE from pitot and static pressure,
> like the Westerboer, to go with my LX 5000 which has electronic TE.
> Gilles

Hi Gilles,

If you are on a budget and looking for a backup TE vario, you might
ask around for a used Rico VAC or VACS; they both use electronic TE
and are (at least used to be) pretty nice varios. Careful about which
model you ask for or get as there are also Rico models that require a
TE probe (VA and VAS, I believe).

Westerboer VW921s are nice electronic TE varios, too bad they come
attached to a somewhat incomprehensible glide computer!

Kirk

[G.A. Seguin]

(Kirk Stant) wrote in message >...
> (G.A. Seguin) wrote in message >...
> > Hi,
> > I am looking for a vario which take TE from pitot and static pressure,
> > like the Westerboer, to go with my LX 5000 which has electronic TE.
> > Gilles
>
> Hi Gilles,
>
> If you are on a budget and looking for a backup TE vario, you might
> ask around for a used Rico VAC or VACS; they both use electronic TE
> and are (at least used to be) pretty nice varios. Careful about which
> model you ask for or get as there are also Rico models that require a
> TE probe (VA and VAS, I believe).
>
> Westerboer VW921s are nice electronic TE varios, too bad they come
> attached to a somewhat incomprehensible glide computer!
>
> Kirk


Hi,
Thank you all for your suggestion. I found out I can have a second vario
display dedicated as a vario only on my lx 5000. I will use that option,
I find it neet not to have a TE probe. The manual for that instrument is
very poor in english for a francophone anyway. L-nav was so easy.
Gilles

[tango4]

Yes the -1 is a mechanical vario. There is a compensator diaphragm in that
bulge on the back of those varios. I believe that is the TE compensation. I
think that the knob changes the amount of compensation. I had one in my old
LS-1 and it was a beautifully sensitive vario but I didn't have a manual for
it then either so I'm unsure of the connections for it.

Ian


"Todd Pattist" > wrote in message
...
> "tango4" > wrote:
>
> >The Bohli is a very sensitive total energy taught band variometer. Todays
> >replacement value is around 2100 Euro ( see
> >http://www.bohli-magnete.ch/pdf/4ins-ve.pdf ) I suspect that you have it
> >connected incorrectly! Anyone out there have a manual for the Bohli vario
> >for Todd?
>
> Your interesting link leads me to suspect I have the
> 68-PVF-2 which is only 830 Euros, rather than the 68-PVF-1
> at 2100 Euros. The -1 says it's TE, the -2 doesn't specify,
> but looks more like mine (except for the M-ring) and the
> price implies it's a more basic instrument. Moreover, I
> would have it inadvertently connected *correctly*, not
> incorrectly, since I had to remove it from the TE probe it
> was originally on. Either way, it definitely has stick
> thermals, but it's interesting to know there's a fancier TE
> version. Does the -1 version operate mechanically? It
> seems to have a knob of some type on it.
> Todd Pattist - "WH" Ventus C
> (Remove DONTSPAMME from address to email reply.)