Jul 15 2020

Pitot – Static System

Today the pitot/static system was completed.

I have a bit of a different idea about plumbing the pitot/static system. I like to use .093 polyurethane 4mm tubing (yellow-static, red-pitot) for my instruments.

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This tubing has a very small ID diameter and is very tough. Since both the static and pitot system do no move air you can use a very small tube to transmit the information. I think using 1/4” tubing for these system is way overkill and not necessary.

I have made adaptor fitting to use with 1/8 in pipe fitting, but I fouind it easier to just by a 1/8” -2 flare fitting and machine the nipple down to .125”. Easy.

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I found a deal on Ebay for 6 AN4-2 fitting for $15. Saved me a bunch of work and they look nice.

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Installed in the AHARS.
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A small adaptor had to be made for the alternate static air mechanical switch.
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I like using the different colored tubing as it make identification of the systems very easy. Here is the Pitot tubing in red.

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The AHARS is plumbed.

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For the T-fittings, I used some 1/8” copper tubing and soldered a tube it. Very easy to make and very robust. Tubing is very hard to stretch to fit over the 1/8” fittings and will never come off.

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You can buy these nylon tee fitting from ACS PN 05-01053 but I found my home make ones work great too. The copper ones are a little heaver, but it is easier to install the tubing on them.

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