Mine--(57mm) reads zero on the ground, but about 2 kt high in the air,
compared to a S-Nav. Yes I understand the "relative netto" thing, but this
occurs while thermaling at 48-52 kt in a DG800B, with the pneumatic switch
on "TE probe".
In addition, the Winter is faster in response than the S-Nav with the
Cambridge set on "fast" (1 sec). The DG factory installation has very short
leads off a "Y" to the S-Nav and Winter, but they are on separate
flasks--both 0.45l, with fairly long leads.

I'm guessing a very small leak in the Winter. I have just removed it and
will test tomorrow.

I thought it was just me!

--
Hartley Falbaum
"Alan Meyer" wrote in message
...
Last year my Winter mechanical variometer may have read a bit
high, but not very much. Today however, on my first flight of
the year, the vario appeared to read 400 feet high in the air and
about 75 feet high on the ground. With the vario reading 400
feet per minute up, the altimiter wasn't doing anything and the
Cambridge electric vario was reading zero sink.

I've searched the r.a.s. archives and found the advice about
zeroing the needle using the adjustment under the faceplate and
putting a trace of nail polish on the needle to weigh it down.

Do these seem like appropriate repairs for this problem?

Can anyone speculate on why the vario might read so much higher
in the air than on the ground? Is there a plumbing problem I
should look for to explain this?

Thanks for any ideas.

Alan