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

From: Steve Brooks

To: Rotary motors in aircraft

Sent: Thursday, July 19, 2007 7:34 AM

Subject: [FlyRotary] Re: Oil cooler inlet

Gentlemen,

I've been following this thread with great interest, as I would still like to make further improvements to my cooling.

Since Ernest lives close by to me, I may see if he can look at my radiators to get his thoughts on improvements.

 

Steve Brooks

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Ed Anderson
Sent: Wednesday, July 18, 2007 3:17 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oil cooler inlet

I agree with Ernest (even if he clearly must be completely and totally wrong {:>)), difficult to find any rule of thumb parameters for a vane. 

 

 I have marked the region (red color)  in you duct that I think is most critical in helping the slower moving boundary layer turn and to prevent/minimize its effect on the rest of the air flow.  Once you have helped the boundary layer accelerate and get around the curve, then I believe the vane has done about all it can.  I would start out the vane approx 1/2 the depth of your opening in order to try and capture some of the higher velocity air outside the boundary layer. I would then compress that air toward the roof of the duct by reducing the distance between vane and top of duct in order to increase its velocity. 

 

Depending on how fancy you want to make the vane, I though that perhaps adding slots so the higher velocity air in the lower part of the duct could help the boundary flow make the turn and further energize it.

 

Don't have a clue as to how much this well help, but I do believe it will help some.

 

Ed 

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

From: Al Gietzen

To: Rotary motors in aircraft

Sent: Wednesday, July 18, 2007 2:15 PM

Subject: [FlyRotary] Oil cooler inlet

Attached is a more accurate drawing of the oil cooler inlet x-section; with a few pressure measurements.  Based on temps, the average flow velocity into the scoop is about 85 fps (57 mph) – all at about 160 mph airplane speed. (Point “A” is really about 4-5” ahead of the scoop.)

 

Ernest; since you were first to propose the internal airflow, or vane; what would you think is the appropriate shape, position, etc.  I can understand your non-participation on the ‘other’ list after being labeled “completely and totally wrong”. (That’s what you get for not reading his bookJ).

 

Others ideas obliviously of interest as well – ED?

 

Al

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