Hi Duncan!
The rad face area is 9x12" so 108 sq in. Inlet area is 34 sq in so ratio
..31. Outlet area is
4 x 12" so 48 sq in so ratio .44.
The idea behind the bell shape is as the air enters the duct and begins to
slow down,
it can follow a tighter radius without separating. When the air enters the
rad, it is
straightened again and then accelerated back to free stream in the
converging duct.
I think I still have some excess cooling capacity so I think this rad/duct
combo is probably
good for 150 hp. The guy in San Diego building the 200 hp supercharged
Europa is pretty much copying my cooling system so it will be interesting!
I have a 2
row dual pass aluminum rad on my setup. I suggested going to a 3 row dual
pass brass for his
supercharged setup.
Glenn
>From: "Duncan & Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
>Reply-To: europa-list@matronics.com
>To: <europa-list@matronics.com>
>Subject: Re: Europa-List: Perfect cooling diffuser
>Date: Sat, 2 Dec 2006 08:22:55 -0000
>
><ami@mcfadyean.freeserve.co.uk>
>
>Glen,
>What is your ratio(s) of inlet area to outlet area?
>I realise that it is adjustable.
>
>Duncan Mcf.
>----- Original Message ----- From: "GLENN CROWDER" <gcrowder2@hotmail.com>
>To: <europa-list@matronics.com>
>Sent: Friday, December 01, 2006 10:28 PM
>Subject: Europa-List: Perfect cooling diffuser
>
>
>>I created an almost exact copy of the Kuchemann/Weber perfect
>>diffuser on my Europa to try and keep my 135 hp EA81 cool.
>>All cooling on the EA81 is thru the water jacket and none is done by air
>>cooling on the 912/914 so the ducting has to be good.
>> Both cooling in the air and ground are very good. I can run the
>>engine as long as desired at 1800 rpm on the ground without over
>>heating even on a 100 F day. In the air, water temps to go 200 F
>>after a 2 minute climbout then drop back to 185 for cruise.
>> There is a 12" long diffuser section that expands like a bell to
>>slow and pressurize the incoming air. After the rad, there is a
>>converging duct that accelerates the hot air back to free stream.
>> There also is a pull up cowl flap inside the converging section
>>that allows most of the incoming air to be shut off under cruise
>>conditions, adding 10 mph by cutting the flow and associated
>>drag when its not needed. Works great!
>>
>> Glenn
>>
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>
>
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