Hi Guys

 I'm about to construct the diffuser for the water exchanger.
 Can some of you guys with operating setups critique the design please.
 So it consists of a K&W diffuser followed by a wedge.

 And a happy Christmas to you all.

 Steve Izett
 Perth Western Australia

 Change the 5.75" dim to about 2 inches.
 The idea is to keep a constant cross sectional area duct up to
 the K&L wedge diffuser. That minimizes the tendency to get wall
 separation in the duct due to a drop in pressure.

 Also raise the core in the cowl as far as you can.

 It would be less risky if the core was 19.5" instead of 17.5 long.
 It might work at 500 cubic inches but 600 cubic inches would
 be better. Check out pick up truck cores.

 ---------------------------------------------------------
 Let me expand on this. It is very difficult and tedious at best to
 design and build a K&W diffuser when you are dealing with offset
 openings. Particularly if the openings are a different shape.

 So keep it simple and use a constant area duct in conjunction with
 a K&L wedge diffuser.

 Paul Lamar



Thanks Paul

Will rethink design.

Steve

I did not put that in the book. However I did put a 3d in the book that
gives the impression that a K&W diffuser can be used with
a K&L diffuser. Sorry about that. On further thought it is a bad
idea for reasons outlined above.

I was thinking about it some more today and I think I have it figured
out how to draw and build a S shaped constant area duct using
a Rhino built in function. Straight walls are not the best. That
S shaped duct will give a smother transition from a typical AC cheek
scoop to a side mounted rad.

Here it is. Rhino is an amazing program to be able to do this in
15 minutes. It will take you a lot longer to build it :)

This is your Christmas present :)

Paul Lamar

Merry Christmas.


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