flyrotary@lancaironline.net Mailing List Archive

Hi Tracy,

Do you have an oil/air separator returning oil to the sump? If not, I suspect the "oil usage" you are seeing may just be oil lost in the blowby. In my early days with plugs up (before I built a new sump), I would get foaming oil out the dip stick when I exceeded 5000 rpm so I built an air/oil separator. Later I discovered that with the new sump keeping the oil level in the block next to zero eliminated the foaming. However, I can imagine that at 7000 rpm the oil mist and foaming as the cooling oil pours (or is slung) from the rotors probably suspends a lot of oil in the air which could get blow out.

FWIW

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----

From: Tracy Crook

To: Rotary motors in aircraft

Sent: Sunday, March 28, 2004 9:08 PM

Subject: [FlyRotary] Re: Renesis & RD-1Cdrivetesting

That conclusion was based on measurements of the blade angle, prop rpm & airspeed and calculating angle to airflow along with the assumption that stall would occur when angle exceeded 15 deg. Then this SWAG was boiled in a pot with observations of how adversely the cooling was affected by the IVO (stalled air blocking inlets).

In other words, it's just my best guess.

One more observation on the RD-1C testing. After about 5 hours of flogging my 89 vintage 13B at engine speeds up to 7050 rpm, I noticed that the oil level was down 1/2 quart. Had never seen a detectable drop in level before.

Tracy (still doing plastic surgery on the RVotter)