REFLECTOR: Oil lines and ground wire.

Scott Derrick scott at tnstaafl.net
Sat Sep 3 21:11:19 CDT 2005


That's very revealing...

thanks,

Scott

Gary T. Ciampa wrote:

> 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
>>
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