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I didn't intend to
cool the engine with radiant plumbing, just thought that it would be a
bonus. if I plumb it thru the interior I would have to actually have to
insulate the tubing I would guess.
I checked out a Yamaha
snowmobile. nothing particularly high tech, just extruded aluminum
channel. I think using flexible tubing however will make the routing
easier and lighter, rather than the miter cuts and welding needed for the
rigid channel. I'll check out the boats, they may be more
aero.
I would still like for
someone to help me compute the heat loss. let's say water at 220 degrees.
air temp, worst case, 100 degrees, climb out air speed 80mph, surface area for 8
3/8 tubes, 7' run = 791 sq" (ignoring fuselage skin contact contribution, if
any). there are coefficients for AL heat transfer that I don't know.
oh, and coolant flow rate? I just have no feel right now if we are talking
the equivalent radiator cooling of .1 sq" or 100. using simply equivalent
surface area of a radiator 1" thick, 15 fins per inch, it requires 52 sq
inches of radiator to have 791 sq". gee, if I covered the plane with
tubing I could eliminate the radiator all together :-) that would be about
as draggy as electrical tape wrapped, well, more like stretched, around the
cowl! (sorry Tracy, I'll bet that stuff was humming along with the
engine :-)
i haven't tried to
talk with ken welter yet. kevin
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