Peter Cowan/Lexi Cameron wrote:
Ok so I don't have a nice drawing program and no pictures yet but let me
see if I can "paint" a picture for you.
My rad measures 11.5 X 16 X2" (this is small by current standards isn't
it?). It has two hoses at one end(right side); one hose at the other (left
side) positioned low on the rad. The right side tubes go to the water pump.
The top of the pump casting has been modified to remove the filler cap and
add a brass bleed valve. The left side tube is simply routed vertically to
become the highest point on the engine with the filler cap and overflow tube
there. I don't recall seeing this arrangement with three tubes to the rad
and don't understand it.
Plumbing is a combination of aluminum tube (maybe 1.5") and low quality
rad hose but it is routed very neatly. Also two runs are within 3" of the
exhaust with no baffle in between.
Peter.
That's cool pardon the pump. No reason why the filler neck cannot be
anywhere in the
system. In your case sounds like a two pass rad with the filler neck in the
middle
of the rad. 368 cubic inches is on the low side for a rad but as I recall
you have
full dynamic pressure such as it is at 100 MPH. How many gallons an hour
did that
thing burn on the way over? Much depends on the HP you are generating and
the
outside air temp.
Paul Lamar
Outside air temp on first flights was about 5 C. (41 F) At 4500 rpm it was burning
5 imp GPH with water 180 and oil maybe 190. Last take off was closer to 10
degrees. Temps started to climb during full power climb out but I throttled
back rather than see how far they would go. Air speed never got much above
85mph (70 in climb).
PC
41 F means the temp difference between the rad and the air is 180 - 41 or about
140 degrees. The rad was working about 40% better than it would if the rad was 200
F and the outside air was 100 F giving a temp difference of only 100 degrees F
which is more typical in the South U.S.
Assume for the moment that was US gallons so that is about 30 pounds of fuel
an hour. Divide by a BSFC of .5 you get about 60 to 70 HP. Not much waste heat.
Paul Lamar
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