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

From: William

To: Rotary motors in aircraft

Sent: Sunday, September 05, 2004 9:29 AM

Subject: [FlyRotary] Re: Doin' the duct

Tommy,

Here are a couple of pictures showing how I did the ducts. There is a layup attached to the lower cowl that was formed on the duct, with a 1/8" spacing, to allow a rubber strip to be put in for sealing/abrasion resistance.

 

Duct sits down in the lip, and is a relatively smooth transition from the cowl lip to the duct lip.

 

Bill Schertz
KIS Cruiser # 4045

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

From: Tommy James

To: Rotary motors in aircraft

Sent: Saturday, September 04, 2004 9:56 PM

Subject: [FlyRotary] Re: Doin' the duct

Thanks, Ed!

TJ

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Saturday, September 04, 2004 8:12 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Doin' the duct

 

My ducts are on the inside of the cowl inlet and yes there is a lip formed by the foam weather stripping which I would rather not have.  On my Latest ducts (yet to fly) I have eliminated the foam, so we will see if that works.  But, with the foam strip I have flown over 225 hours with plenty of cooling.  So while I do agree they undoubtedly distrube the airflow, apparently not enough to interfere in any serious way with my cooling.

 

Ed

 

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

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

From: Tommy James

To: Rotary motors in aircraft

Sent: Saturday, September 04, 2004 8:33 PM

Subject: [FlyRotary] Re: Doin' the duct

 

Sorry Ed, the last time I looked at your ducts there was a big donut in the opening..:0).   Is there a turbulence causing lip with the duct, foam separator and the cowl?  Does the duct fit around the outside of cowl inlet?

TJ

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Saturday, September 04, 2004 7:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Doin' the duct

 

Tommy, I basically bring my ducts out to the inlet opening and use a bit of 1/8" thick foam weather-strip insulation to prevent contact between duct and inlet part of cowling.  There is very little vibration to content with unlike a Lycoming which would play havoc with such a set up.

 

Ed

 

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

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

From: Tommy James

To: Rotary motors in aircraft

Sent: Saturday, September 04, 2004 6:10 PM

Subject: [FlyRotary] Doin' the duct

 

Hi Guys.

I need understanding on how to mate the radiator ducts with the cowl opening.  I can see how to mount the rads to motor mount and redrive back plate.  Follow on in the footsteps of master glass scuptors like Tracy. Ed and RD with foam, electrical tape and poprivets.

But I can’t ‘see’ the junction of duct and cowl..  Thanks for any ideas.  The duct tape is a little cheezie..:-)

Regards,

Tommy James<>< (designing second edition cooling system)

 

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