flyrotary@lancaironline.net Mailing List Archive

I think it is more complicated than that. Roughly 1/3 of the rejected heat is from the oil, and 2/3 from the water. All heat must eventually be rejected to the air. An oil-to-air cooler is rejecting 180F oil to ~90-100F air, while a oil-water is rejecting to hot water ( greater than 100F maybe 150), additionally if 1/3 comes from the oil and you are forcing it all to the water the water exchanger would at least have to be 50% larger or in your example 1800 cu in.

From: william Aldridge

Sent: Sunday, August 20, 2017 9:05 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Coolers

Just trying to understand how these laminova exchangers work. I'm just pulling numbers out of the air for this. So here's my understanding of how a cooling system with a laminova would work: let's say you have a water heat exchanger with 1200 cu inches of volume and a oil cooler with 400 cubic inches of volume. If you wanted to use a laminova in this system you would get rid of the oil cooler and put in a water cooler with 1600 cu inches of volume to handle the heat load that used to be handled by the oil cooler. Am i in the ballpark here?

Thanks,

Will Aldridge

Sent from my Verizon, Samsung Galaxy smartphone

In a message dated 8/18/2017 7:18:12 P.M. Eastern Daylight Time, flyrotary@lancaironline.net writes:

The only one that I found on eBay!
I was watching for years when I got a notice that one was listed and then I won the auction. I think it came out of England. It still wasn't cheap but had never been used.

https://goo.gl/photos/JDJMBhxzdZBXSFfn8

I don't remember the model number and there isn't one that I can see on it.

On Fri, Aug 18, 2017, 07:33 A R Goldman, <flyrotary@lancaironline.net> wrote:

Todd I too am using the laminova-- not started the engine yet and won't for a while--

Which model did you choose???

Thanx

Rich

Sent from my iPhone

On Aug 17, 2017, at 9:50 PM, Todd Bartrim <flyrotary@lancaironline.net> wrote:

Hi Andrew;
I put one of these Laminova exchangers from Mocal in my plane.

https://www.racerpartswholesale.com/category/Mocal_Heat_Exchangers

Very compact but still a few pounds, but it seems to work well so far.

I used to see better oil cooling in climb than water cooling, but in cruise I had better water cooling than oil cooling.

This was likely from my old, good looking oil cooler scoop, which I don't think was very efficient. I've cut that off and changed it to more of a P51 style scoop. Still looks ok, but it should work much better, so when I return to flight I'll not be able to say definitively if any improvements are due to the Laminova cooler or the improved airflow. However, so far in static ground tests my H2O/Oil temps are quite close.

Todd waiting for the smoke to clear

Virus-free. www.avast.com

Todd Bartrim

On Thu, Aug 17, 2017 at 1:06 PM, Lehanover <flyrotary@lancaironline.net> wrote:

Lynn, from your explanation, seems to confirm my gut feel that I need to have that external OCV, to cool all the oil being pumped. but maybe I could use a oil to coolant exchanger to even up the system capacities.

Cheers Andrew

I tried one of those years ago. Big. Very heavy with both water and oil inside. Oil temps were fine. Water temps too high. I cut off the outer shell and used it as a oil to air, transmission cooler. It is just a standard oil to air cooler in a box full of water.

Mazda had one in the RX-7...........for one year. I mounted under the oil filter.

Lynn E. Hanover