Hi Paul,

I’m working on the oil system for the Renesis in my plane. I plan on a remote oil filter.  I see the ID of the stock passages, tubing and fittings is about 3/8” in most locations.

I have not found clear recommendations for the ideal sizing of these lines in the prior posts and publications related to aircraft.

While we know that size matters, if I need to cool about 180-200hp, is there any advantage to the extra weight and bulk for larger fittings and hoses by going to AN-10 or larger, instead of staying with the stock sizes (3/8 ID) that  would correspond to AN-8 ?

Also, do you see any disadvantage to using 5052 aluminum lines for any runs that are fixed (e.g. oil cooler base to remote location, redrive, etc.?


Thanks,

Scott Gettings


Some people use AN -10 but IMHO that is over Kill. I would use AN-8.
In these RV4 pictures the only thing not AN-8 is the gear box supply
and drain back. The TTC plumbing is a night mare :-) I did not do that :-)
If I was allowed to revise it I would do it in a heart beat :-)

Some of the TTC has -10 or larger and that is needed for 650HP.

The OD of the -8 braided hose is about .6 inch and the ID is about .34.

Not quite 3/8 at .375.

If you use solid metal lines (pipe) they are 1/2 inch OD.


Paul Lamar



Thanks very much, Paul. The reduction drive oil inlet is AN-4 and the drains are AN-6.  I will use AN-8 for the rest of the oil flow.

It is surprising that the AN eight soft aluminum 3003 has a working pressure of 390 pounds and a burst of strength over twice that. But I will use the 5052 tubing for fixed runs, which is what the hydraulic lines in my plane are made of.

Scott Gettings

Make sure none of it can vibrate.

Paul Lamar


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