REFLECTOR: Oil lines and ground wire.

[Gary T. Ciampa]

Scott,

I am *not* the builder of my 173 FG, but in speaking with the builder, 
the original plans called for the oil supply and return in the same 
duct. He ran into high oil temperature problems and re-routed one of the 
lines down the co-pilot side. The oil temperature problems were 
corrected with the modification.

Cheers,

Gary

>As far as running the lines in separate ducts it only helps by preventing
>the return oil being heated by the in-coming oil, so separating (or
>insulating) them in the same is just as good.  If you have outside air
>flowing through the ducts, you can get some additional cooling, but that has
>some additional issues. The high pressure hose that is already in there has
>walls that are somewhat insulating; and a good steel-braid covered line
>could be more reliable than solid aluminum (not subject to vibration
>fatigue).  
>
> 
>
>FWIW,
>
> 
>
>Al
>
> 
>
> 
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>Behalf Of Scott Derrick
>Sent: Saturday, September 03, 2005 7:04 AM
>To: Velocity Aircraft Owners and Builders list
>Subject: REFLECTOR: Oil lines and ground wire.
>
> 
>
>My plane came with high pressure hoses for oil lines. Both ran in the 
>
>pilot side duct.  I noticed that the manual calls for 1/2 " aluminum 
>
>lines.   I was considering replacing the high pressure rubber/steel flex 
>
>lines with aluminum.  Much lighter and smaller, those hydraulic lines 
>
>are huge and heavy.
>
> 
>
>I was also considering running one up the pilot side and the other down 
>
>the copilot side to take advantage of the additional cooling benefits.  
>
>Has anybody done the comparison of running both in one duct and one in 
>
>each to see if there really is an advantage?
>
> 
>
>Then I got to thinking about using the oil lines for my ground return 
>
>path from the battery to the engine?  Aluminum is a pretty good 
>
>conductor, and having two lines would seem to provide a substantial 
>
>return path if I bonded both tubes at both ends? 
>
> 
>
>Anybody do this?
>
> 
>
>Scott
>
>_______________________________________________
>
>To change your email address, visit
>http://www.tvbf.org/mailman/listinfo/reflector
>
>  
>