Keith Moore wrote:

Paul/Perry:

Perhaps you may wish to consider the "heat pipe" concept.   Instead of the
tubes filled with water, seal the tubes and add just a little distilled
water and ammonia.  Pull a vacuum until you get down to the vapor pressure
of the mixture.

Now you have a very high efficiency (transfers heat at the speed of sound) &
"light weight"  heat transfer device!

 Position the engine water manifold at the bottom (low side - rotate your
sketch 90 degrees, clockwise).  The water would enter one side and return in
the other side.  The engine water manifold should have some  surface area
contact with the heat pipes. The heat from the engine will quickly boil the
liquid to steam which  rises up the pipe.  And as the steam cools
(condense), the liquid returns to pick up more heat.

A similar but simpler fabrication scheme would be formed from two sheets of
aluminum, each with a series of dimples to keep them apart, rolled into the
diameter you want, and then seal welded on each edge.

If you are serious, there is some heat transfer analysis necessary.

Regards,

Keith "BlackHat" Moore
Long Easy

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