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Ed,
I would like to have more information on the reason for keeping the boundary
layer air out. My current scoop is open, and lets in both. If the boundary
layer air needs to be excluded, then my next scoop will have to be like the
P51 scoop which does exclude it. I never really understood why.
Looks like I may have to have another look at Bulents' scoop. His is made
like the P51.
Steve
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Tuesday, June 29, 2004 7:56 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Temps finally down
Sounds like you are closing on the solution, Steve, congratulations. Its
always nice when you get to the point where you can fly without one eye on
the temps.
The boundary layer (particularly with coolers to the rear of an airframe)
appears to play a big role. The layer increases in depth as you go rearward
and it creates havoc with the operation of cooling ducts and diffusers. One
article I read indicated the American P-51 and German fighter designers
figured out the significance of keeping the boundary layer out of the
cooling ducts whereas the British supposedly continued to be plagued with
cooling problems with the Spitfires due to their cooling inlets being partly
in the boundary layer. FWIW
Keep us apprised
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Steve Brooks" <steve@tsisp.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, June 29, 2004 6:37 PM
Subject: [FlyRotary] Temps finally down
> I made my eight flight today, and I'm happy to report that my inlet scoop
> augmentation on the Cozy did the trick.
> I flew only about 1/2 hour because I had some other work that I wanted to
do
> on it, but the temperatures ran at 190 coolant, and 200 oil.
> I climbed up a couple thousand feet, and instead of throttling back and
> watching my temperatures come back down from 210/220, I wasn't quite up to
a
> stabilized temperature yet. That was a big change. I pulled power back
to
> what I had been running previously, and the temperatures stayed the same,
> maybe dropped a little. I then throttled up to zero boost, and the
> temperatures held. YEAH !!!!! They used to climb up with the throttle.
> On the decent to landing, I thought that I would have to chip the ice off
of
> the engine. Coolant dropped almost off the gauge to about 140, and oil
down
> to 160. Actually when I touched down, they were even lower than that.
>
> Now that I know that I can cool it, I'm going to make another scoop,
> narrower on the sides, but a little taller (actually lower) to get a
little
> further outside the boundary layer. The next scoop will have a smaller
> inlet area compared to the current one.
>
> Steve Brooks
> Cozy MKIV N75CZ
> Turbo Rotary
>
>
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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