Perry Mick wrote:

Aircraft spruce pn 03-40300, 3003-0 soft aluminum tubing, 3/16 od by

.028

wall, good for 880 psi. So the ID would be .1315.

Length of one tube approx. 38" * pi = 120" or 10'
Internal volume is 1.63 cubic inch. Use about 30 tubes for 48.9 cubic

inches

of water in the rad not including tanks.

Water weighs 62.4 lbs/cubic foot, or .43 lb/cubic inch. So the weight of

the

water in the rad would be 21.2 lbs. I guess it's a little higher than I
thought.

So using squashed tubes would lower the weight of water and probably

make

the heat transfer more effective.

Woops, made an error, corrected below:

Length of one tube approx. 38" * pi = 120" or 10'
Internal volume is 1.63 cubic inch. Use about 30 tubes for 48.9 cubic

inches

of water in the rad not including tanks.

Water weighs 62.4 lbs/cubic foot, or .036 lb/cubic inch. So the weight

of

the water in the rad would be 1.77 lbs.

Perry

You would probably want to furnace braze all the tubes to a flat sheet
of aluminum and then roll the whole works up into the ID of the duct.

Too much trouble and too expensive :)

Paul Lamar

How about using the duct sidewalls (inside) as an extractor in some way.
This would allow to make the intake to the cooler smaller - less drag. Of
course this means to fabricate a extractor duct that fits inside the
ductwalls.

Option: Use the planned prop (impeller?) - extension as a axial-air-pump
(producing a suction behind the cooler or radiator). This would need some
kind of manifold behind the flywheel, a perforated extension and a air exit
nozzle instead of the pressure recovery bulb (...or partially replacing it).
This thing would be roughly analog to the radiator fan in a car.....
At cruise you still could reduce air intake with area reducing flaps.
Or one could combine this with Pauls idea of a shrouded radiator, hinge the
rad at the rear and raise it to reduce intake area, which would be a whole
lot smaller to start with if a air pump is producing a bigger delta p.

Thomas J. :)

 
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