Lynn,
 >   I've used Earl's hose and fittings on oil lines in my cars for 20 years
 > without a problem. I'd like to hear of any bad experiences you've had

that

 > makes you say anything that can be assembled at home isnt good enough.
Have
 > you had failures with Earl's (or Aeroquip) hose and fittings?
 >
 > Mike Wills

I have had hose failures over the years, but they were all traced to the

idiot that built the car (me).  The point was that Earls and two types of
Aeroquip are not aircraft quality hoses, and are not intended to be. The
reusable aluminum fittings with the nice colors are very good for race cars.
Easy to put together, light weight and available in any race store. We just
dropped out of the national champion race after 16 laps because a real
aircraft fitting failed. It had two occlusions in the threaded area and
cracked between them. I use both the braided stainless with Teflon liner and
the new Aeroquip push on style. The fittings have barbed tubes, and the hose
is two layers of Kevlar lined hose (blue) in many sizes. Looks good, very
light. Good for 200 pounds. For aircraft use the exposed stainless braid is
seldom used. When it is, it is on standoffs in adel clamps. If it gets loose
the braid can saw through another hose or airframe aluminum or electrical
wire. Most aircraft fluids are carried in formed tubing. Otherwise in cloth
covered flex hose. The hose liner is selected specifically for the fluid
being carried. Exposed braid is good for hoses that have both ends attached
to an item where no relative movement is going on. The race car stuff is just
not aircraft stuff. Never mount braided line where engine movement will
result in the hose being twisted. Offset the connections so that there is an
"S" shape to the hose. The twisting will result in a longer length of hose
put into bending. Installation rules are in the hose catalogs.
Lynn E. Hanover

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org