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Date: Sun, 14 Jun 2009 21:32:36 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] A big win!
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Don Wallker wrote:
> RV-8 Renesis N113BR
> EC-2 EM-2 RD-C
> Catto 76/88 Tuned intake 17.5 inches, Tuned exhaust 24 in
> Flys like an RV, quietest plane on the field. 3.5 hours in the air.  
> My legs have stopped shaking when I fly.
>
> Thanks to the 2 guys who added cowl flaps and solved their cooling 
> problems.  I listened to them and others who had conflicting views 
> here at Stead.  The conventional wisdom is that the discharge air from 
> the cowl needs to be about 80% of the incoming air.  At least for air 
> cooled engines.  One guy mentioned that the Sube flyers had a way to 
> cool better by cutting holes in the outside bottom of the cowling just 
> forward of the firewall and putting scoops on the inside to direct the 
> air out.  Since the pressure is higher on the outside of the cowling, 
> there has to be a reverse scoop (facing backwards) so there is a low 
> pressure area and the air will flow out.  On the stock RV cowl, the 
> factory inlet area is about 50 sq inches and the outlet about 50 sq 
> inches too. My inlet is about 44 sq in as I use part of the left cheek 
> for the  intake manifold.  The sube guys figured out that the outlet 
> has to be 1.5 to 1.8 times bigger than the inlet.  I cut my cowl 
> (ouch) and added about 17 sq inches per side on the bottom for a total 
> of 34 sq inches additional discharge.   Where I used to climb out at 
> 205 oil and 195 water on a 40 degree day.  I'm now climbing out at 175 
> oil and 185 water on a 60 degree day.  Running a little cool during 
> cruise so will be building adjustable cowl flaps with servos.  I'm not 
> yet developing full power, so sizes may change.  I'm using an oil 
> cooler slightly larger than stock and the radiator that Tracy is using 
> in his RV-8 so I am probably over radiatored.  Of course I can't at 
> present find the Sube file where I got this info, but I find it later 
> and send it.  Cooling is still not very good on the ground and on hot 
> days the taxi will have to be short.  Once in the air it is great!
> Thanks for the write ups by Ed and Al.  I not only learned, but took 
> action.  Added battery back up for my Dynon EFIS in case I my 
> electrics fail, I will still have airspeed and altitude.  I added a 
> canopy switch that turns OFF a big panel light when the canopy is 
> latched TIGHT and added it to my checklist.
>
> Don Walker
>
> -- 
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
Congrats, Don. Now, details & pics please.

Charlie