Tip: Use of AN fittings with Nylon tubing

[#N72CR]

I'm going to try these with the nylon tubing. If I can find them in 1/8" NPT. Ace Hardware will have something

[TS Flightlines]

a stem system, like on the late model automotive fuel injection systems. Works well.
Tom

[islandmonkey]

Stein does a good line in pitot and and static line fittings. In previous post he has said they are very good and problem free. They can be found here:


http://www.steinair.net/store.cfm?tlcatid=43

[Av8torTom]

I've been using these from the home supply stores



Here I'm connecting 1/4 aluminum to 1/4 plastic for my AOA pitot.
Easily disconnected too.

[grayforge]

Be sure to check temperature and pressure ratings for the hoses & fittings you use. Some only spec down to 32 degrees Fahrenheit. I grabbed barbed couplers and soft silicon hose from McMaster.

Silicon Hose, good from -94 to +392 F

Nylon Couplers, good from -60 to +200 F

[dedgemon]

Actual Tygon brand tubing seems to work the best. Very pliable, doesnt stiffen up like the vinyls. Seems to last forever.. Probably have to order it.

10 years of RV9 use without a leak, and many more years in various sailplanes before that.

As long as you dont think youre building a 737, this will work great.

Originally Posted by Sam Buchanan

I'll have to defer to your experience in the desert since my history is limited to the hot, muggy South.



Sounds like a reasonable belt and suspenders approach. I haven't had the need to use the o-ring but it seems like a clever solution if the need arises.

I have found some tubing to be more pliable than others. The "softer" tubing seems to conform and to and grip the barbs very aggressively, so much so that it is nearly impossible to pull the tubing off the barb. A little prowling in the aviation department of various hardware stores or your local auto parts emporium will turn up tubing that is suitable for our uses.

Sam Buchanan

[Jimzim]

Soft plastic it is! Any suggestion as to how to route them (1 a/s and 1 AOA) from the left wing root through he spar? I hope to go side of the cockpit left wall, just not sure of the best way past the spar...
Thanks, Jim

[Walt]

Originally Posted by Av8torTom

I've been using these from the home supply stores



Here I'm connecting 1/4 aluminum to 1/4 plastic for my AOA pitot.
Easily disconnected too.

I've seen a number of these installed, and they usually leak.

My observation for what works well:
The quick release fittings that stein sells
Nylo-Seal tube and fittings (do not try to push this onto a 'T', use only with nylo fittings).
Barb fittings and good hose like stratoflex 193 or similar

[gtmule]

Originally Posted by Walt

I've seen a number of these installed, and they usually leak.

My observation for what works well:
The quick release fittings that stein sells
Nylo-Seal tube and fittings (do not try to push this onto a 'T', use only with nylo fittings).
Barb fittings and good hose like stratoflex 193 or similar

I've used the ones like Stein sells for stuff at work, they work great, and are SO easy to deal with. Just make sure you get a good cut (Stein sells cutters, but a SHARP knife works good, too).