Another point that I'd like to bring up right now is hose sizes. I often hear the statement that a car is only run on 30% power on average and yet the auto manufactures use a minimum of 1 1/4" hoses for coolant. But in our airplanes builders commonly use much smaller hoses & fittings usually in order to use AN fittings of which I believe AN16 is the largest (correct me if I'm wrong) and is only 3/4". I don't understand this reasoning. I used 1 1/4" hoses up to the "T" where the rads are plumbed in parallel, where I step it down to 2 -1"hoses. Even the "T's" were made with minimum restriction in mind. If we have a higher power demand from the engine (which is always used as a reason not to use EWP's), then why restrict it's coolant flow?
 
 Hi Todd,
 
If I'm not mistaken, Tracy is using 3/4" hoses???  I've been using AN12 hoses, with two evap cores in series, and there has never been a question of cooling the water on the RV-3, even in severe climb tests.  The antique mechanical pump does have a lot of muscle, and might be making up for it though, and I still haven't found a way to test the EWP by itself in flight.
 
Cheers,
Rusty (wondering where my font appeared)