On 25 May, 02:32, jsbrake wrote:
Hi All,
Whenever I accelerate, my varios bump up and tell me I'm climbing,
then settle back to reality. *Any idea of what I need to look for to
fix this?
My setup:
Kestrel 19, two static ports in the tail boom, pitot and TE in the
fin. *The TE line is split under the seat using a Y connector and then
travels to two varios (a Winter mechanical and a 1990-era audio/final-
glide called a VariCalc). *Pitot and static lines are split behind the
panel using T connectors.
I replaced all the non-permanent tubing last year and they all seemed
to be leak-free.
Thanks!
-John


A TE system in which the negative dynamic head compensation is exactly
'right' will do just this. It does not not necessarily indicate a
fault in installation. It is generally manifest during vigorous
changes in load factor. A TE vario reflects rate of change in energy
height not actual height so if you pull/push g the change in induced
drag as a result of load change represents a change in energy. e.g.
Pull up and increase load and therefore induced drag and your total
energy reduces which is manifest as sink on your total energy vario.
And vice versa.

Some commercial probes compensate for this by being deliberately not
quite exactly 'right'. Many probes are not spot on because the maker
can't manage it which is almost invariably true of any home made
device or one of poor design such as the Nicks and Braunschweig tubes.
Thus your observation is relatively uncommon.

If your system is truly reflecting your energy changes then try flying
a little more smoothly for you are throwing energy away.

There is no reason why you should not couple two varios to one TE
source but put the Y connector as far away from the panel as possible
to prevent one vario puffing into the other.