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All turbo oil drains must go downhill (good to also have a check valve), and return oil must enter oil pan above the level of the oil------if you can't mount the turbo high enough for this you must have a scavenge pump.
Marc Wiese
From: "Russell Duffy" <13brv3@bellsouth.net>
Date: 2005/06/13 Mon PM 10:51:14 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] turbo oil drain
Let me start this message by saying- shut up John :-)
Now that that's out of the way, my little brain is concocting another turbo
scheme for the RV-3. It seems that I have an almost perfect place to put a
turbo now, which is right at the cowl exit. The only problem I see is the
oil return from the turbo. It's my understanding that you can't have any backpressure at all on the
return. Is that true for all turbos, or just some? In other words, can you
specify a certain type of bearings and seals that will allow this uphill
return of oil? I've heard of scavenging pumps to handle the oil return, but in the bit of
searching I've done, I just can't find anything that appears to be made for
this. If I could work around this oil return, and hold off long enough for someone
to find a turbo that works, this could be a sweet deal. Cheers,
Rusty (OK, John, go ahead and say it)
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