Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "sqpilot@earthlink" <sqpilot@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 02, 2004 12:51 PM
Subject: [FlyRotary] psru oil


> Ed....you mentioned that you have an .035 restrictor in the line feeding
> your PSRU.  I dropped off my -4AN to 1/8male pipe adapter to the welder,
and
> he is going to fill it with weld so I can drill the restrictor hole.  Next
> question.  I can install this restrictor at either end of the hose....at
the
> oil filter housing end, or at the opposite end of the hose where it enters
> the PSRU.  Would one be preferable over the other? If I install it at the
> filter housing, the oil flow will be reduced before it even enters the
.125
> dia hose.  If I install it at the other end of the hose, the hose will get
> full pressure until the restrictor, just as it enters the PSRU.  Hose life
> shouldn't be a concern, as it is stainless braided.
>       Last question....with such a small restriction, do the sun gears
> merely get oil splashed on them, or does the PSRU actually fill with oil?
> As always, I appreciate your guidance.  Paul Conner
>
>


Paul, I don't think it really matters on which end you place the restrictor.
I put it next to the block for the reason you mentioned - the 1 in 1,000,000
chance a leak might develop in the line or fitting then it might reduce the
oil loss sufficient to put her down.  But, again just my annal rententive
view on design.  If you can easily do something to even take care of the 1
in 1,000,000 chance - then why not do it that way.

The Sun Gears are splash lubricated in the Ross.  I think Tracy design his
such that they have an oil spray.  No, the Ross PSRU does not completely
fill with oil.  While I have never looked inside one while it was operating,
I suspect there is 1"-2" of oil in the bottom lowest part. A lot of oil is
apparently slung around by the spining gears.   I think I aided my Ross gear
galling by putting in a second drain and further reducing oil input with a
smaller restrictor.  Just too little lubrication.  Tracy's used the full oil
pressure and you MUST NOT use an oil line restrictor.

Ed Anderson