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Old May 25th 10, 10:39 PM posted to rec.aviation.soaring
Peter Gray
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Posts: 6
Default Pneumatics Question

On 25 May, 19:39, jsbrake wrote:
On May 25, 1:23*pm, Peter Gray wrote:



On 25 May, 17:29, jsbrake wrote:


UH: When I pull up, the varios go up... both of 'em.


There's about 2' of silcon tubing in the circuit, all of it at the
panel end. *The second line of TE is silicon from the Y splitter that
I installed, so call that about 4' long. *The pvc lines end at the
central pedestal where the hood and panel are removable, so there's
silicon, then a 5-way quick-connector and then silicon to the
instruments. *I could probably remove about 4-6" of extra silicon, but
it gives me some "play" for being able to get at the quick-connect
without needing extra joints in my arms.


I'm not doing heavy g manoevers, maybe 1.5 g on a pull-up, perhaps
0.75 g on a push-over. *The most g I normally pull is during
thermalling turns.


I think I recall reading in the aircraft notes about a Brunswick
tube. *It appears to be factory made and the slots are well-defined..


An up indication no matter which way you push or pull isn't a matter
of degree of compensation. A few inches of squashy tube won't make a
difference and it sounds like you have relatively modest quantities.


I am puzzled why different manoeuvres have the same effect. It
somewhat suggests multiple pathology.


Two questions ref egg sucking. Pneumatic netto was common in the
seventies, presumably there is no cruise/climb switch in the plumbing
to the Winter?


It did have pneumatic netto, but the plumbing was removed before I got
the ship. *I still have the brass fitting.

When you did your leak test did you connect to the Brunswick tube? If
so did you remember to put a piece of wire (about .020") up the slots
and into the plastic test pipe to stop the pipe sealing around the end
of the probe?


I removed the Brunswick and connected directly to the stub sticking
out of the fin. *Air flows easily through the Brunswick.


What that doesn't do is test the integrity of the joint between probe
and socket in the fin.