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Date: Sun, 23 Apr 2006 18:33:49 -0400
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From: "Dan Schaefer" <dfs155@adelphia.net>
Subject: Cooling ducts
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Interesting pics, Paul. Just goes to demonstrate why our airplanes are 
"Experimental".

As in the current thread on methods of fuel management in LNC2's, there are 
as many ideas (good, not-so-good and in between) as there are airplanes and 
builders.

I also semi-wrapped my cylinders with Al shrouds, with an outlet around 1 
inch across - though I didn't go to the extent that you did, with the outlet 
ducting seen in your pics. I'm sure I could squeeze a few more knots out of 
N235SP if I did but, for me, it's not worth the time and effort. Even 
without the exit ducting as in your airplane, I have a problem (most of the 
time, in cruise) getting the CHT's high enough to where I think they should 
be - I rarely see higher than 300 - 320 dF. Not ideal, but probably better 
than running too high. The higher CHT's are probably more important in the 
larger engines to keep from wiping out the choke (I have a Lyc O-235-L2C in 
mine).

Anyway, you have an interesting LNC2 (LNC2.5?).

Dan Schaefer
N235SP    Early 235.