On 9 May 2020, at 10:15 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:

Opposite of what I understand:
You want a large external radius and a smaller inside radius.

I've in vain been searching for the NACA paper that Tracy Crook get the exact number (internal/external) from. Probably somewhere between 0.5 and 0.8.

Finn

On 5/8/2020 11:02 PM, Terry Adams terrywadams@sbcglobal.net wrote:

You may want to test the lip/airflow on the scoop to your cooling.� Adding a generous radius to the inside may add considerable airflow.� Consult the work and directions given by Peter Garrison and his plane Melmoth (www.melmoth2.com).� jm2c fwiw

Terry

On 5/8/2020 3:34 PM, 12348ung@gmail.com wrote:

Le Roux,

                    You have done a great job so I hesitate to add photos of

my work, but here goes   Neil.

-----Original Message-----

From: Rotary motors in aircraft 

<flyrotary@lancaironline.net>

 

Sent: Friday, May 8, 2020 10:31 PM

To: Rotary motors in aircraft 

<flyrotary@lancaironline.net>

Subject: [FlyRotary] Re: Rotary Engine Noise

Hello Le Roux:

This Frontal photo tells you quite a bit about my cowlings and my airplane.

The top two inlets are for my oil coolers (2 x Fluidyne DB-30416) and the

bottom inlet is for my radiator (Griffin 2-58185-X).

With a "Chubby Cubby" drag is given, things like Aero-Turbine mufflers and

long exhaust pipes (to get noise behind cabin) are not too significant. 

Jeff: Thanks for taking us aboard the flight over the Ottawa River!

I am a relative new member on the group, and are not on terms, with the FWF

installations of the members.

Is it possible to post some info of your 13B installation and cowling?

 

Thanks Le Roux Breytenbach

South Africa

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