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Try http://www.aavidthermalloy.com/ They make a two sided finned extrusion that is 9+ inches wide, and weighs 9.9 #/ft. (part number 69545) I think you need fins on the inside as well as the outside because of the low thermal conductivity of oil. The profile is and for a 3in length the power dissipation is shown below. Natural Convection Heat Sink Temperature Rise Above Ambient Heat Sink Thermal Resistance 35.0 26.2 17.5 8.8 0.0 5.0 15.0 25.0 35.0 45.0 2.00 1.50 1.00 0.50 0.00 5.0 15.0 25.0 35.0 45.0 Power Dissipated (W) Power Dissipated (W) Forced Convection Heat Sink Temperature Rise Above Ambient (50W Dissipated) Heat Sink Thermal Resistance Air Flow (m/s) Air Flow (m/s) 1.0 2.0 3.0 4.1 5.1 20.0 15.0 10.0 5.0 0.0 200 400 600 800 1000 1.0 2.0 3.0 4.1 5.1 0.50 0.38 0.25 0.12 0.00 200 400 600 800 1000 Air Flow (LFM) Air Flow (LFM) Bill Schertz KIS Cruiser # 4045 ----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Sent: Wednesday, September 20, 2006 12:18 PM Subject: [FlyRotary] Re: finned aluminum sheets? Russell Duffy wrote: Greetings, As I pre-think some things I want to try next, one of the thoughts is to make the oil pan into a significant oil cooler if possible. My proposed single rotor applications will have the engine out in the breeze, so it seems worthwhile to try to get as much cooling as possible from the airflow. The best way I can think of to do this would be to use a thin aluminum plate for at least the bottom of the pan. Ideally, it would have heatsink fins on both sides (milled away for the pickup tube on the inside). Has anyone ever seen aluminum with fins on both sides? Does anyone have a good source for finned aluminum of any type? Thanks, Rusty (sure don't want to mill my own) Here's the best candidate I could find: http://www.thermaflo.com/foldedfin.shtml -- ,|"|"|, Ernest Christley | ----===<{{(oQo)}}>===---- Dyke Delta Builder | o| d |o http://ernest.isa-geek.org | -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/