Perry Mick wrote:
  >
  > The rads are hung under the engine, from four long (8 inches?)
vertical
  > threaded rods into the 1/4 inch aluminum plate between the oil pan
and
  > engine.
  > They are pretty rigid, no rubber mounts, no leaks.
  >
  > I think what Jeff is saying could be done, the rads would then not
mount
  > to the engine at all, but in my case would be a part of my lower
cowl,
  > with some improved structural connections to the fuselage.  I have a
  > four-
  > part cowl, the top half, two lower sides, and a bottom piece that
  > contains
  > some ducting for the rads.
  >
Paul wrote:

 So I assume in your new design the cowls will be fastened to the
 fuselage and with the engine and ducted fan moving around inside of them.
 Correct?

True, major cowl mods and will have to have larger openings in the cowl
where the duct struts go through, unlike currently.

I also suspect the one serpentine tube and fin design you are using
 is more rugged than the braised aluminum traditional rad.

Actually there are two of them, plumbed in parallel, but stacked one
on top of the other with about 1/4 inch space between them.  The only
thing that's bothered me about them is the cross-sectional area of
eight 1/4 inch diameter tubes is not much.  Have had no durability
or cooling problems.  Only oil temp problems.

--
Perry J. Mick
Duckt N7XR
http://www.ductedfan.com

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