flyrotary@lancaironline.net Mailing List Archive

Hi Bill

Can we confirm your setup.

5.5" diameter nostrils = 23.8 sq inch per side.

You have a total of 70 sq inches in so you have another entry apart from the nostrils?

Steve Izett

On 19/04/2011, at 3:23 AM, Bill Bradburry wrote:

Tracy,

Nothing! It didn’t exist!

The right nostril, 5.5 inch diameter, and a 3 inch scat tube, which came off the oil cooler inlet, was all the cool air inlet I had coming to the radiator. When I added the 4 inch scat tube from the left nostril, it started to cool.

I now have 27 sq inches of opening feeding the oil cooler, a total of 43 sq inches of opening feeding the radiator. The cowl outlets total 110 sq inches. So 70 inches in and 110 inches out. Pressure inside the cowl is running about 5 inches of water. If I found myself in cooler weather, I might be able to make the last cowl exit opening adjustable (cowl flap). With the current and soon expected temps I would never be able to close it, so no pressure to make it adjustable right now.

Bill B

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy
Sent: Monday, April 18, 2011 2:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Finally! The temps are under control!

Hi Bill,
I would have thought 4" scat tube would be on the small side. What was it before?

Tracy

On Mon, Apr 18, 2011 at 9:45 AM, Bill Bradburry <bbradburry@bellsouth.net> wrote:

I installed a 4 inch flex tube to bring air from the left nostril over to the radiator and that solved the problem! Water temps climb to around 208-9 or so on take off and then they lower to the mid 190s. Oil is running about 175. Now that I can fly without the fear that I am going to lose the temps, I can concentrate on the checks I need to do during the 40 hour flyoff! Oat was bout 88 degrees.

I am flying off a Class C airport, so temps are always high before I take the active.

Bill B N249B

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