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07-08-2018, 08:11 AM
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Join Date: Jul 2012
Location: n. wi
Posts: 775
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pitot/static lines
hi all,
i have the 1/4'' o.d. poly lines for the lines and i also have metal fittings, 1/8npt to attach to the instruments. i would like so use the nylon 1/8'' dia. barbed type fittings in some places. will the barbs form a good enough seal being pushed into the relatively stiff poly? my wild guess is that they would be fine for this application.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
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07-08-2018, 11:11 AM
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been here awhile
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,300
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Take a good look at your local big box building supply store (Lowes, etc) to see if they carry plastic push-on fittings with NPT threads that will be compatible with your 1/4" poly tubing. Some folks use these specialized aviation fittings for hooking up ice maker supply lines.....  |
07-09-2018, 08:33 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,120
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Quote:
Originally Posted by Sam Buchanan
Take a good look at your local big box building supply store (Lowes, etc) to see if they carry plastic push-on fittings with NPT threads that will be compatible with your 1/4" poly tubing. Some folks use these specialized aviation fittings for hooking up ice maker supply lines..... |
And smear a little fuel lube on the outside of the tubing just before you mate it up - those O-ring seals do a great job sealing with water pressure in them but I've had a few minor leaks using them for pitot-static without any real pressure inside.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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07-12-2018, 07:27 AM
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Join Date: Jul 2012
Location: n. wi
Posts: 775
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checked out lowes/menards and they have them but a trip to them takes most of the day for me. found many sites on the web. cheap and lightweight. thanks guys.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
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07-12-2018, 10:42 AM
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Join Date: Jul 2005
Posts: 1,341
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The barbs are fine. I used Tygon tubing. My only leak was the NPT side of a plastic fitting at the instrument. Kind of crappy threads if you look at them, with a mold seam across the threads. I went to metal for the barb-to-NPT fittings. No issues.
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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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07-12-2018, 11:06 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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I used these to do some pitot/static plumbing for a dual G5 install. No leaks.
https://www.ebay.com/itm/10pc-Push-I...53.m2749.l2649
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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07-12-2018, 12:14 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,667
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Don't recommend the cheap water fitting from HD/Lowes, I've replaced many. Barbs and rubber/silcone/pvc tubing works ok but don't try to push a poly or nylo line onto a barb, guaranteed to crack eventually, replaced many. Honestly I prefer nylo tube and nylo fittings whenever possible with siicone tube and barbs a close second.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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07-12-2018, 08:51 PM
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Join Date: Jul 2018
Location: Naples fl
Posts: 140
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Brass
Tempting to use plastic fittings but I went with brass compression by Parker.
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