Mailing List Message #67346
From: Le Roux Breytenbach <>
Subject: Re: [FlyRotary] Re: Wedge diffuser
Date: Fri, 25 Nov 2022 05:45:04 +0200
To: Rotary motors in aircraft <>
Les : Do you have perhaps a photo of the “wedge diffucer” you mentioned?
I have The Mazda Papers and right at the end of his book there is a drawing of a cowling with the proposed diffucer

Le Roux

Sent from my iPhone
Le Roux Breytenbach 

On 23 Nov 2022, at 15:53, Marc Wiese <> wrote:

Did you check Paul Lamar’s site or his book?

Sent from my iPhone

On Nov 22, 2022, at 8:50 PM, Les C <> wrote:

While doing some research online, I saw same good pictures of the 20b installation in Tracy's RV-8.  I am particularly interested in the wedge diffuser he used for his radiator cooling.  I've been looking on the mail list, but don't see anything referencing it or any other information about the ducting.  I have been planning on using a ventral radiator with a scoop to provide the cooling I'll need.  I'm building a BD-4 and I may have enough room in my cowling for both the wedge diffuser and cooling for my oil.  Does anyone have thoughts, suggestions or directions?  I've looked for the K&W book, but haven't been able to find it or any copies of it. 

Les Criscillo
Nurse, Pilot, Brewmaster, Maker
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