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Wow John, your radiator seems huge compared to mine. My former build buddy is the one who sized my radiator. He is still a buddy but lost interest in the build. My rad is only 12 3/8 X 23 3/8 X 2 1/2. Hmmmm, I was playing tonight and I am all but certain I have the room for a considerably larger radiator. Also, I pulled the stock oil cooler out of storage ( I found it online well after my current set up was installed...but now........?). It too would fit in the space provided. Currently I have a standard aviation oil cooler in the nose, as provided by Velocity, Inc and a Mazda secondary oil cooler in the cowl. The secondary oil cooler was considered adequate but if I am gonna beef up cooling, this seems to be another place that can help as my oil temps seemed to track my coolant temps. The secondary oil cooler is half the size of the standard Mazda oil cooler. In my case either fits fine so I will be changing to the larger oil cooler and looking at changing radiators.
This is especially true since I hope to ad a turbo one day as well....maybe right out of the box if I can find someone to help fabricate a turbo exhaust manifold. All the ones I have found so far tilt up to fit the turbo. This tilt interferes with the Mistral intake. I have noticed on pictures of the Mistral turbo, the manifolds sticks straight out thus lowering the location of the turbo for clearance from their standard intake.
All the best,
Chris
----- Original Message ----- From: "John Slade" <sladerj@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, January 26, 2009 12:52 PM
Subject: [FlyRotary] Re: Current Turbos being Used
David,
The rad looks to be a similar size to mine (26 * 16 * 3), but I never liked his elephant trunk P51 thing. If I remember right, his cooling was sufficient but, just like Greg Richter's multi-scoop setup, I think he was creating a lot of drag. My rad is symmetrical to the airframe angled as much as possible to the incoming air and my plenum is uses the bottom of the lower cowl as its base. I don't know how well the air will turn a right angle and go through the oil cooler, but its hard to find anywhere else to put the long thin one. I felt that the coolers (2 oil and 1 rad) should all be directly on the plenum, thus all getting the same pressure. I would have put the intercooler on the plenum too, but didn't have room so I had to add a 3 inch duct to it. As a result I think my intake temp (and EGT) is a bit high. I also have a filtered (with bypass) duct to the turbo air intake.
Yes, I thought I had two oil coolers. The differences are minimal.
>or exhaust flow to aid in air flow through the engine cowling / engine
compartment and across all heat exchangers.
yes. I put a stock turbo shield over the T04, then extended it with a stainless steel shroud extending just beyond an 8 inch cowl exit. The 3 inch exhaust stops a few inches short of the exit so air is sucked through the rads and past the turbo. At least thats the theory.
If you add a fan, try to make it pull air from outside rather than from in cowl. ie it needs to pressurize all possible airflow areas except the one you want to draw from (the naca). My oil coolers weren't pressurized by the fan, so I'm guessing it pulled its air through them.
>Wow, the standard NACA scoop is working that well for you.
Yes. I was careful to make a nice airfoil shaped wing for the bottom of the opening to create low pressure in the entrance. The plenum must be tightly sealed. Also, I have two vortilons on the belly behind the landing brake.
>Not sure why they wouldn't have a proven turbo with the ceramic bearing.
Yes, you'd think so. I just took the recommendation of a guy who obviously knew a lot about flying turbos. I hope they use a better ceramic coating than the one they put on the outside of the turbo - that lasted about 6 hours.
Regards,
John
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