It’s not the security of the connectors I worry about; it is the
quality of the flare on the tube, mating to the flared AN connector and all the
mass of fluid and tube is absorbed at the compression joint … the same is true
for flexible hoses but they won’t metal-fatigue and fail outright.
I use rigid soft aluminum 3/8” for fuel lines in the
gravity-feed portion of the fuel system; they are not pressurized; they are
secured in multiple locations and tank to airframe uses a rubber hose. I find
the flares are easy to do, but finicky to make leak-proof … Jeff
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of n3773@comcast.net
Sent: Friday, May 08, 2009 1:33 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] lines
i
thought that the rigid lines were more secure on the ends than flex, which is
why the C/S prop governor uses rigid for the 600(?)psi line to the prop.
mid-span support(s) is usually simple. does the rotary oil pulse
pressure dictate a steel line? kevin
[years ago when i made up braided oil cooler lines for my O-320 we used
corps of engineers test equipment- could test in excess of 100,000psi, not that
we tried it !!!]