Pneumatic switching?

"T o d d P a t t i s t" wrote in message
...
Marc Ramsey wrote:

If it were my glider, I'd always run the 302 off the nose pitot and
fuselage static, using the 302s (excellent) electronic total energy
compensation.
I'm flying a
glider with an electronic TE vario (C302) on nose pitot and tail boom
static (which is all that is available), and I've never seen it shown
any "errors"

I have very limited personal experience with electronic TE.
I'll take your word for it that it works for you on the nose
pitot and tail static. That said, however, I have found
Mike Borgelt's comments to be right on target every time, so
even if it works for you, others may see problems.


When I ordered my 302, I talked with Dave Ellis about using the tail probe
inputs vs. using the 302's electronic compensation. This was several years
ago, so I may be leaving something out. The gist of it was that he felt the
302's electronic compensation was very good, but not quite as good as a well
installed fin mounted TE probe with good plumbing.

I also discussed pneumatic switching for a self-launch with Dave . . . and
he agreed this to be an acceptable approach. That's were the old brain
starts to fade a bit, as I can't remember if we discussed exactly *what* to
switch (g) . . . and that's why I posted my original question.

I am aware that I can simply use the 302's very good electronic TE. However,
since I went to the effort to design and install a remote mount for two
Clippard pneumatic switches near the forward end of the glareshield (where
they take no panel space), I'll continue to use them *if* that turns out to
be the best solution. The switching works fine BTW, no leaks and so far
reliable. Absent a better suggestion, I'll leave it the way it is.

all the best,

bumper