Mailing List flyrotary@lancaironline.net Message #15236
From: Al Gietzen <ALVentures@cox.net>
Subject: RE: [FlyRotary] Re: water cooled matrix in oil pan
Date: Fri, 14 Jan 2005 23:05:52 -0800
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

Subject: [FlyRotary] Re: water cooled matrix in oil pan

 

<...oil moves in the channels of the oil cooler at about 20 ft/min ...

oil entered the pan at one end and traversed across it might be moving

about ½ ft/min ...>

 

20 fpm through the cooler seems really slow. What is the oil pump output

volume? I'd have thought something on the order of 10 gpm or so. 20 fpm

through a foot long oil cooler that holds a quart of oil is only 5 gpm

output from the pump. Is that right?

 

Trying to do the math ... Jim S.

 

I guess my 30 second calculation is wrong – too low by a factor of 12 (1728 cu. in. in a cu. ft.; not 144) so it should be 240 ft/min, 4 ft/sec (that’s more like it).  It’s a rough estimate for 12 gpm and about a square inch of passage area.  Same factor for the movement in the pan – about 6 ft/min.

 

Thanks for pointing that out.

 

Al

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