Sharing static and pitot line

I have run in to problems sharing a pitot between ASI and Cambridge
302, resulting in several very frustrating days at Hobbs one year where
it seemed as if I had forgotten to thermal. Separate pitots for the two
instruments solved the problem. Luckily, I have a tail pitot and a nose
pitot so each can have its own. The 302 seems particularly fussy about
having its own pitot and static sources however.

John Cochrane

BB wrote:
I have run in to problems sharing a pitot between ASI and Cambridge
302, resulting in several very frustrating days at Hobbs one year
where
it seemed as if I had forgotten to thermal. Separate pitots for the
two
instruments solved the problem. Luckily, I have a tail pitot and a
nose
pitot so each can have its own. The 302 seems particularly fussy
about
having its own pitot and static sources however.

John Cochrane

John,
I'm flying a 302 in my LS8 and cannot recall any problems in having it
attached to the same pitot that supplies pressure to the ASI. How
would you describe the behavior of the 302, just weird
deflections/audio signals?

Herb, J7

I went through that learning curve with the 302 in Hobbs last summer.
The working combination was to have the 302's static and TE/static
ports connected to the same source, and (very important!) changing the
302's internal setup to use electronic TE. Once I did that, the 302's
vario and my B-40 danced to the same tune.

2NO

BB wrote:
I have run in to problems sharing a pitot between ASI and Cambridge
302, resulting in several very frustrating days at Hobbs one year where
it seemed as if I had forgotten to thermal. Separate pitots for the two
instruments solved the problem. Luckily, I have a tail pitot and a nose
pitot so each can have its own. The 302 seems particularly fussy about
having its own pitot and static sources however.

Based on my experience with my 302, I don't think it was the 302. On my
ASH 26 E, I went from a tail mounted TE feed to the 302 to using the ASI
pitot/static (electronic TE) with no detectable change in ASI or 302
operation. Just guessing: perhaps your connection involved a leak, or
maybe the 302 was not happy using a nose pitot and a TE probe and static
at the rear of the glider.


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Eric Greenwell
Washington State
USA

Hello,
Maybe there was a misunderstanding.
I am asking advices for the following:
On a PIK20D, there are 4(four) tubes comming up from the cockpit at the panel:
1. Pitot from the nose
2. TE from the fin
3. Left rear fuselage static
4. Right rear fuselage static
What would be the best (optimal) tubing for the following instruments ?
1. Simple ASI
2. Simple Altimeter
3. Simple PZL mech vario
4. Peschges VP9