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Here are the only photos available right now ... you can see the change in the cowl openings. Originally the RX7 cooler was sitting on top of the PSRU; at this location the PSRU plate behind the cooler
was blocking too much of the exit air. So I first installed a Fluidyne oil cooler on left side of engine - this alone did not work, but with the second cooler installed around the spinner center and the reduced opening behind the spinner ... success! I can
take some photos with the cowls off when I get home from business, if you wish to see them.
Jeff
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of Jeff Whaley [jwhaley@datacast.com]
Sent: Tuesday, October 13, 2009 2:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: No more hot oil ... Yes!
Okay Kelly, but I've been operating away from the office for a few days and will be for the remainder of the week ... I'll catch up next week. Jeff
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of Kelly Troyer [keltro@att.net]
Sent: Tuesday, October 13, 2009 8:30 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] No more hot oil ... Yes!
Photos Jeff !!..............Photos...........Both of your oil cooler (s) and the cowl spinner inlet...............
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from Jeff Whaley <jwhaley@datacast.com>: --------------
Finally my days of too hot oil are behind me! We flew on Thursday evening at 17C or 62F ... oil never exceeded 150F and in cruise was actually about 135F with the water temperature
at 175F. Almost too cold, but if you add 30 degrees, to 92F the oil would be around 165F. I will add some restrictors on the oil cooler intakes for the upcoming winter ... that I can live with.
So the second oil cooler made a big difference; unfortunately it wasn't the only thing I did. I also reduced the size of the cowl opening behind the spinner and centered it
better, the original opening was 9" and offset to the low side (remember that pressure gradient diagram) so it got reduced to 6" and the lower edge lifted almost 3". I was so glued to the gauges infront of me that I forgot to turn around and glance at the
manometer - I'll bet the oil cooler differential was more than on previous flights - if true that would prove the spinner opening was over pressurizing the cowling - I'll be sure to check next time.
Jeff
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